Understand your system. Find the right setting.

Match the full model and hardware generation before following an instruction.

The download centre distinguishes Venus E 3.0, E 4.0, E Max, E Pro and E mini, as well as Venus D and Venus D AC Version. A feature described for one version is not evidence that an older unit supports it.

Record the complete label, region and firmware. If a brochure, manual and app disagree, keep the conflicting information and ask support which document applies to your serial number. An announcement or downloadable brochure does not establish availability at NKON.

What to check or record

1. Match the hardware and app manuals separately.
2. Keep the manual revision with your equipment record.
3. Share serial numbers privately with support.

Power describes the rate of energy flow; capacity describes stored energy.

A load drawing 500 W uses 0.5 kWh in one hour. Two such loads together draw 1 kW. These are arithmetic examples, not Marstek ratings. A large kWh capacity does not guarantee enough output power to run a particular appliance.

Check continuous output power, temporary surge power and usable energy separately. A model name is not a substitute for these specifications. Charging also depends on available input power and the permitted charging rate.

What to check or record

1. Divide W by 1000 to get kW.
2. Multiply average kW by hours to estimate kWh.
3. Compare simultaneous loads with the exact output rating.

Estimate from energy available to the load and average demand.

Runtime in hours is approximately available kWh divided by average kW. If 3.2 kWh actually reaches appliances drawing an average of 0.4 kW, the estimate is 8 hours. This is a calculation example, not a guaranteed runtime.

A refrigerator cycles and a heat pump changes demand. Measure a representative period instead of using only the appliance label. Check startup demand separately. A runtime calculation cannot prove backup compatibility or uninterrupted operation.

What to check or record

1. Allow for reserve and conversion losses.
2. Measure average demand over time.
3. Check startup demand against the output limit.

Nominal energy, permitted discharge energy and energy at an AC outlet differ.

Some charge remains outside the permitted operating window. Conversion losses and the system’s own consumption further reduce the energy delivered to appliances. Compare battery-side and AC-side measurements only after accounting for their different boundaries.

Illustrative example: a nominal 5 kWh battery used over an 80% window has 4 kWh in that window before losses. This does not prescribe an 80% setting. Record the actual reserve or DoD and the starting and ending charge levels before judging capacity.

What to check or record

1. Check nominal versus usable capacity.
2. Record the actual discharge window.
3. Compare periods with similar charge endpoints.

A one-way conversion figure does not describe a complete storage cycle.

Round-trip efficiency compares useful energy returned with energy put into storage across the same boundary. An illustrative cycle receiving 4 kWh and returning 3.4 kWh has an efficiency of 85%, provided starting and ending charge are comparable.

A maximum inverter-efficiency figure describes a different test. Low-power operation, standby time and additional conversions affect real household results. Compare whole-cycle energy; one momentary power reading cannot establish efficiency or savings.

What to check or record

1. Use the same measurement boundary.
2. Include standby energy over the period.
3. Keep temperature and charge endpoints in the record.

Compare available surplus with the energy you want to use later.

Collect representative days of generation and demand. Separate daytime surplus from evening consumption. Extra capacity may add little value if the battery rarely has enough surplus or charging time to fill.

Record desired backup reserve and simultaneous power demand too. Repeat the comparison for summer and winter. These observations support a discussion with an installer; they do not establish a payback period. Future expansion requires exact module compatibility checks.

What to check or record

1. Use daily profiles as well as annual totals.
2. Reserve energy for outages if needed.
3. Check output power and compatibility as well as capacity.

Only at the same voltage; use Wh or kWh to compare energy.

Approximate nominal Wh equals nominal volts multiplied by amp-hours. Divide mAh by 1000 first. For example, 50 Ah at 40 V represents 2000 Wh; 50 Ah at 10 V represents 500 Wh. These are educational examples, not Marstek specifications.

Cell-level and pack-level figures can differ because of the series and parallel arrangement. Use the full manufacturer specification. A difference between cell Ah and pack Ah does not by itself justify changing an app setting or product listing.

What to check or record

1. Keep voltage and Ah together.
2. Prefer documented pack energy.
3. Separate cell data from complete-system data.

Check the exact product, purchase channel and applicable terms.

Marstek’s current commercial policy lists 10 years for several storage families and meters, while noting that distributor terms may differ. Portable manuals may specify another period. Do not apply a Venus warranty automatically to an M-series power station.

Keep the invoice and applicable purchase terms. For an NKON purchase, send the order reference and fault evidence to [email protected]. Manufacturer assistance is also available through [email protected]. A claim requires assessment of the actual product and fault.

What to check or record

1. Keep proof of purchase.
2. Record when the fault first occurred.
3. Check the terms for this purchase.

Use the official app flow for your device.

The current policy describes registration when adding a device, or later from device details under Settings → Warranty. Upload valid proof of purchase through that flow. Screens can vary by product and app version.

If the screen is missing, record the app version and model and ask support to confirm the process. Keep your confirmation privately with the invoice; avoid posting account or serial-number screenshots publicly.

What to check or record

1. Use the official app.
2. Check that the invoice matches the device.
3. Keep the registration confirmation.

Provide a reproducible timeline with settings and readings from the same time.

A useful report explains what you expected, what happened, when it happened and what changed recently. Include the exact alarm text, operating mode, charge level, grid reading and a timestamped power-flow screenshot.

Keep a log of each attempted change: previous value, new value and result. This helps separate configuration from intermittent communication or equipment faults. Send serial numbers and invoices privately. Do not open the enclosure to obtain diagnostic information.

What to check or record

1. Include model and visible firmware versions.
2. Attach dated fault and settings screenshots.
3. State whether the issue is continuous or intermittent.

Use its own power-station manual and intended appliance connections.

The linked V500 manual describes a 500 W, approximately 2 kWh solar generator with an AC output and solar input. It is not interchangeable with a Venus grid-connected battery. Its own manual defines the ports and operating modes.

Check the appliance’s continuous and startup demand. Never feed a house socket from a portable AC output or use an improvised male-to-male lead. Supplying building circuits requires suitable equipment and a properly designed transfer arrangement.

What to check or record

1. Identify the V500-specific ports.
2. Check the appliance against output limits.
3. Use intended outlets and approved accessories.

Charge in the battery does not mean the AC outlet is enabled.

The M-series manuals describe separate output controls. Check the AC indicator, any shutdown timer and the appliance load. A light-load timer may switch off an otherwise healthy unit after a quiet period.

Compare the display with the matching manual. Record the outlet and appliance involved. If a safe, known low-power appliance works but a motor does not, startup demand may explain the difference. Repeated resets without changing an excessive load do not resolve the cause.

What to check or record

1. Check the output switch and indicator.
2. Review the light-load timer.
3. Record the alarm and appliance rating.

Follow this model’s storage interval and charge range.

The linked M1200 manual recommends cool, dry storage, replenishing charge every 3 months and maintaining 60%–80% charge during long storage. This is not a universal instruction for every Marstek product.

Keep a dated record of condition, charge level and the next check. Switch off unused outputs as instructed. Before reuse, inspect the unit and leads and confirm that the charging environment is within the documented limits.

What to check or record

1. Use the exact model’s storage instructions.
2. Schedule the documented charge check.
3. Do not recharge a visibly damaged unit.

Stop using damaged equipment and arrange an assessment.

Marstek’s portable manuals warn against operating damaged or modified equipment and against user disassembly. A burnt connector, exposed conductor or unusual smell is not an app-setting problem.

Keep people away. Disconnect only if safe; do not handle a hot, leaking or smoking battery. For immediate fire or electrical danger, move away and contact emergency services. For a non-emergency fault, document visible damage safely and ask the seller for the assessment and transport procedure.

What to check or record

1. Do not open or bypass protection.
2. Do not repeatedly reconnect suspect equipment.
3. Ask before shipping a damaged battery.

Arrange the appropriate collection or return route first.

The M2200 manual directs users to separate collection or the retailer for end-of-life equipment. A large lithium battery does not belong in ordinary household waste. Faulty equipment may need different transport arrangements from an intact product.

Contact the seller with the model, condition and return reason. Original packaging does not by itself make a damaged battery suitable for shipping. Follow the approved handling process; removing an internal battery yourself is not a routine disposal step.

What to check or record

1. Contact the retailer or collection service.
2. Disclose damage before arranging transport.
3. Keep the return authorization if required.

A 24-field equipment, installation and settings record.

Document the equipment before changing settings. This worksheet includes both possible app inputs and installer-record information. It does not imply that every device exposes all 24 items as editable controls.

Match the device and meter manuals to the hardware. Obtain circuit, protection and PV calculations from the installer. Keep protective limits separate from optional goals such as self-consumption or outage reserve.

Save the selected mode and reopen its screen. Observe a stable situation with known loads and compare the control meter at the same time as the battery. A delayed graph is not proof of a live control failure. Make one change at a time and preserve the previous value.

This commissioning aid was assembled for this guide. Mark unsupported fields as not applicable. Where documents conflict, keep the discrepancy and resolve it before treating a brochure figure as an app instruction.

Setup inputs

Exact model and revision

Where it is used

Device label

What to enter or collect

Full name, generation and regional variant.

Why it matters

Similar names may have different ports and limits.

Serial number

Where it is used

Private support record

What to enter or collect

Record privately; share through support only.

Why it matters

Identifies the device without public exposure.

Manual revision

Where it is used

Commissioning record

What to enter or collect

Title, revision/date and matching download link.

Why it matters

Keeps the instruction basis traceable.

App version

Where it is used

App information

What to enter or collect

App version and phone operating system.

Why it matters

Menus can differ between versions.

Device firmware

Where it is used

Device information

What to enter or collect

All visible component and meter firmware versions.

Why it matters

One version may not describe the complete system.

Installation region

Where it is used

Installer record

What to enter or collect

Actual country and region; approved grid profile if relevant.

Why it matters

Connection requirements vary by installation.

Connection arrangement

Where it is used

Installer handover

What to enter or collect

AC storage, direct PV, external microinverter or portable supply.

Why it matters

Determines which energy paths exist.

Circuit and phase

Where it is used

Installer handover

What to enter or collect

Circuit, phase and approved connection method.

Why it matters

Software limits do not prove electrical suitability.

Permitted charge power

Where it is used

Relevant settings / installer record

What to enter or collect

Approved input limit in W.

Why it matters

Device capability and circuit allowance can differ.

Permitted discharge power

Where it is used

Grid-output settings if supported

What to enter or collect

Approved output limit in W for this model and region.

Why it matters

A higher menu option is not authorization to use it.

Battery modules

Where it is used

Equipment inventory

What to enter or collect

Exact module model, count and approved arrangement.

Why it matters

Physical fit does not establish compatibility.

Nominal energy

Where it is used

Nameplate / system record

What to enter or collect

Documented installed energy in kWh.

Why it matters

Avoids confusing Ah with kWh.

Minimum charge or DoD

Where it is used

Relevant battery settings

What to enter or collect

Exact label, unit and supported value.

Why it matters

DoD and minimum SOC are not interchangeable numbers.

Backup reserve

Where it is used

Backup settings if supported

What to enter or collect

Chosen reserve and intended loads.

Why it matters

Reserved energy is unavailable for routine discharge.

Operating mode

Where it is used

Work-mode screen

What to enter or collect

Selected mode and exact screen name.

Why it matters

Different modes respond to different inputs.

Schedule

Where it is used

Manual mode if supported

What to enter or collect

Times, days, direction and power.

Why it matters

Both timing and charge/discharge direction must match the goal.

Tariff and time zone

Where it is used

Tariff settings if supported

What to enter or collect

Actual supported provider/market and local time zone.

Why it matters

Wrong price or time inputs change the schedule.

Meter model

Where it is used

Meter label / compatibility document

What to enter or collect

Full model and revision.

Why it matters

P1, CT or Shelly alone is not an exact model.

Meter assignment

Where it is used

Battery meter setup

What to enter or collect

The meter selected to control this battery.

Why it matters

Visibility in the account does not prove assignment.

Meter sign and phases

Where it is used

Commissioning observations

What to enter or collect

Import/export direction and stable relevant phase readings.

Why it matters

Wrong signs or stale data mislead control.

Network connection

Where it is used

Network configuration

What to enter or collect

Type, network name and signal conditions; keep passwords private.

Why it matters

Battery and meter need the supported communication path.

PV input data

Where it is used

Panel labels / installer calculation

What to enter or collect

Per input: module, arrangement, cold Voc, current and power.

Why it matters

Total wattage alone cannot prove compatibility.

Backup load list

Where it is used

Backup design

What to enter or collect

Continuous and startup demand of intended appliances.

Why it matters

Energy, power and transfer requirements all matter.

Verification baseline

Where it is used

Saved commissioning record

What to enter or collect

Timestamped settings, SOC, power flows and alarm state.

Why it matters

Reopening and observing verifies more than pressing Save.

What to check or record

1. Identify equipment first.
2. Have electrical fields confirmed by the installer.
3. Validate meter direction.
4. Save, reopen and observe.

Observe a known starting configuration before adding more automation.

Finish the equipment record and installer handover. Confirm the matching manuals, supported meter and app. Select the intended operating mode using that model’s guide, and record every active schedule, limit and reserve.

Observe normal household demand during a stable period. Compare grid power, battery power and charge level with a common timestamp. Investigate incorrect measurements before tuning control. Tariff automation cannot correct a meter with a reversed sign or unreliable communication.

Over several days, record generation, demand, charging and discharge energy. Note cloudy weather and unusual loads. Keep immediate power readings separate from daily energy totals. Backup testing must follow the exact product procedure and installer handover; do not alter electrical wiring to simulate an outage.

Review one question at a time: did a schedule start at the expected time, did discharge stop at the reserve, or was charging limited when export occurred? Keep the initial evidence, make a supported adjustment and compare similar conditions. This is an observation plan, not a manufacturer-prescribed calibration routine.

What to check or record

1. Keep a before/after change log.
2. Check timestamps before diagnosing control.
3. Record faults before resetting.
4. Retain a known working configuration.

The family name is only the start: match the label, generation, market and document.

Read the full product label and the device-information screen together. Record the commercial name, model code, serial number and firmware versions. A name such as Venus E may appear across several generations; a familiar-looking app screen does not prove identical hardware. Marstek now lists E 3.0, E 4.0, E Max, E Mini and E Pro separately.

Use the document cover and model table to check that a download applies to your unit. Keep the file or revision date in your system record. If a web link label and the actual PDF title disagree, follow the PDF identity and ask for the correct manual. Do not transplant power settings from another owner's screenshot.

What to check or record

1. Photograph the product label without publishing its serial number.
2. Record firmware versions and the manual revision.
3. Match every power or capacity claim to the identified unit.

Treat installation dimensions, ports and accessories as generation-specific.

The official E 3.0 product page identifies a redesigned enclosure and separate RJ45 connections for Ethernet and RS485. The published E 3.0 installation drawing also differs from older C/E drawings. These are practical reasons to use the correct generation's instructions when planning the location or communications.

A connector's shape alone does not define its job. Read its label before choosing a cable; an RS485 connector is not automatically a network connection. Compare the actual unit with the supplied packing list before ordering brackets or accessories. For an existing installation, document what is already fitted rather than assuming that a current photograph shows your unit.

What to check or record

1. Identify the generation from documentation and label, not colour alone.
2. Check LAN and RS485 labels individually.
3. Verify bracket, dimensions and accessory compatibility for that revision.

No. The C/E manual identifies separate models with different energy capacity.

The manufacturer C/E manual identifies Venus C as MST-BIE2.5-2500 and Venus E as MST-BIE5-2500. They share parts of the operating concept, but they are separate products. Shared manual sections do not make the batteries interchangeable or guarantee identical runtime, mounting or supplied accessories.

For planning, compare the energy figure for the actual model with the energy you want to shift each day. Separately compare its output rating with the appliances that may run together. A larger energy store primarily changes how long energy remains available; it does not establish a different approved circuit connection. Use the precise model specification for any purchase or installation decision.

What to check or record

1. Write down C or E and the full MST model code.
2. Compare capacity and power in separate columns.
3. Use the matching packing list and dimensions.

The E 3.0 is an AC-coupled battery; existing PV normally reaches it through an inverter.

AC coupling means the solar installation first converts panel energy to AC. The battery then exchanges energy with the home's AC system. The Venus E 3.0 is marketed for this existing-PV arrangement; it is not the same device architecture as a model with dedicated DC MPPT inputs.

Draw the actual energy path before buying cables: panels, PV inverter, home AC system and battery. A direct panel connection needs a specifically rated PV input on the selected product. Do not use a communications socket or a backup AC socket as a DC solar input. Ask the installer to confirm the design if the existing PV and battery will also be expected to operate during an outage.

What to check or record

1. Check whether the exact model has labelled DC PV inputs.
2. Identify the existing PV inverter and AC connection.
3. Separate normal grid operation from outage operation in the design.

Compare the exact edition's PV inputs, AC rating and compatible modules.

Both families have been presented with direct solar-input versions and modular storage, but their ratings should not be treated as interchangeable. The 2025 launch material describes different PV and AC capabilities for A and D. Later product information can also differ from launch figures or older app screenshots.

Make a comparison using the current documents for the units being supplied: PV channel count, allowed voltage and current per channel, grid power, backup output, base module, expansion range and communications. Avoid deciding from the largest number in the product name. A system may have more solar input than instantaneous AC output; the two describe different parts of its energy path. Get clarification before purchase when the supplied quote and manual disagree.

What to check or record

1. Compare exact regional product editions.
2. Record PV limits separately from AC power.
3. Ask which battery-module part numbers are supported.

No. The official documents distinguish the AC-Version from the solar-input version.

The AC-Version product introduction describes a stackable AC-coupled system. The separate Venus D introduction describes direct PV inputs with four MPPT channels. These two descriptions should not be merged into one specification simply because both use the Venus D name.

Use the connector panel and exact sales designation to settle which product you have. For a retrofit that keeps an existing solar inverter, map the AC coupling path. For new panels intended to connect directly, verify that the supplied version actually includes the required PV inputs. The battery-module discussion is separate: even when an official document names the same module family, confirmation of the whole supported combination still matters.

What to check or record

1. Confirm whether the order says AC-Version.
2. Check the actual input connectors before planning PV wiring.
3. Use the correct version's manual and module list.

Official documents from different editions do not currently show one consistent number.

The linked Venus D app guide shows Grid Power Configuration choices of 800 W and 2200 W. The current official Venus D product page and EU introduction advertise 2500 W bidirectional power. This is a source/version discrepancy, not a reason to assume that every earlier unit can be upgraded to the newer figure.

Use the rating label, hardware edition and installed firmware to ask Marstek or the supplier which limit applies to your serial number. Preserve the old value until that is confirmed and the installation is suitable. In your records, distinguish advertised hardware capability, the option actually available in the app and the limit approved for the installed circuit.

What to check or record

1. Record the currently offered app choices.
2. Compare the label with the manual date.
3. Obtain model-specific confirmation before raising the limit.

Plan Venus X as a residential installation with an electrician.

Marstek's Venus X introduction describes an AC-coupled residential system with 6 kW output and a 10 kWh base energy store. It explicitly calls for electrician installation. The published design includes separate grid, AC-PV and backup functions; these are not permission to adapt a small-battery plug-in arrangement.

Before ordering, have the installer map the supply, loads, existing PV inverter, protective devices and backup circuits. Confirm access and structural support for the actual unit as well as the electrical requirements. Product capacity is only one part of the design: the location, circuit ratings, approved grid connection and intended backup behaviour must all fit together.

What to check or record

1. Obtain an installation design for the exact Venus X edition.
2. Identify grid, AC PV and backup paths separately.
3. Confirm site access, support and electrical protection before delivery.

Use only the expansion module and arrangement approved for that product.

A shared brand, similar enclosure or nominal capacity does not establish electrical or firmware compatibility. Marstek's Venus D documentation names a particular storage-module family; Venus X uses a different expansion architecture. These examples show why a generic 'Marstek expansion battery' description is insufficient.

Before adding storage, record the host model, module part number, number already installed and any revision requirements. Ask for the matching expansion instructions, including the permitted module count and preparation sequence. Expansion is also a commissioning change: after installation, the displayed module count and capacity should match the physical system. Do not open packs or improvise adapters to make unmatched units fit.

What to check or record

1. Match host and module part numbers in the official instructions.
2. Confirm the permitted total, including the base module.
3. Verify that all installed modules are recognised after commissioning.

More stored energy and higher inverter output are different upgrades.

Adding compatible modules increases available energy within the supported system. It does not automatically change the AC rating of the host inverter. For example, the D AC-Version documentation describes stackable capacity and separately states the host's AC power. A larger stack can therefore support a similar load for longer without becoming a higher-rated inverter.

When sizing, write down two targets: the energy required over the chosen period and the maximum simultaneous load. Check both against the approved configuration. If an appliance already exceeds the output limit, adding storage alone is not a reliable solution. Multi-inverter arrangements, where supported, need their own approved coordination and electrical design.

What to check or record

1. Compare host power and total energy separately.
2. Check the combined load including startup demand.
3. Do not multiply host AC power by the number of passive modules.

AC-coupled models can store grid energy, but the operating plan still needs a purpose.

The Venus family includes AC-coupled products that can charge from the grid. Solar panels are therefore not a prerequisite for every use case. A battery without PV might be used for supported scheduled charging or a carefully planned backup function; the exact modes remain model-dependent.

Decide what success means before entering settings. For time shifting, compare purchased energy, delivered energy and tariff differences over the same period. For backup, define the loads and energy reserve. Do not assume that moving energy through a battery guarantees savings. Keep a baseline record of household consumption so the later result can be compared with operation before storage.

What to check or record

1. Choose the intended use: time shifting, self-consumption or backup.
2. Confirm the exact model's grid-charging capability.
3. Keep a baseline and account for losses when reviewing results.

Check Grid Power Configuration and the installation's approved operating limit.

The E3 app guide documents 800 W and 2500 W choices for maximum grid-connected discharge. An 800 W setting can therefore explain a flat output ceiling even when the battery has energy remaining. It does not prove a fault or establish that the higher option is appropriate for the installation.

Record the selected limit and compare it with the real output during a stable load. Have the circuit and applicable requirements checked before increasing the setting. Also separate maximum power from requested power: in self-consumption operation the battery may deliberately supply less than its limit because the measured demand is lower. A maximum is a ceiling, not a continuous target.

What to check or record

1. Read the saved Grid Power Configuration value.
2. Compare power during a stable, known demand.
3. Confirm the permitted circuit and regional limit before changing it.

Check the battery's condition as well as the requested operating mode.

Battery protection can restrict operation when temperature is unsuitable. The E 3.0 troubleshooting table includes temperature-related limitations; the current E Max description likewise identifies temperature as one of the BMS-protected conditions. A request for more power cannot safely override a protective restriction.

Compare an affected period with a normal one: ambient conditions, reported temperature, requested power, actual power and alarms. Make sure the product has the ventilation and clearances required by its own installation manual. A cool room reading does not necessarily equal internal battery temperature. If a temperature warning persists in normal conditions, send the recorded information to support rather than repeatedly changing limits.

What to check or record

1. Record temperature and any exact alarm at the same timestamp.
2. Inspect the surrounding space for blocked cooling or direct heat.
3. Escalate persistent restrictions instead of bypassing protection.

DoD describes how much may be used; SoC describes how much is presently stored.

Depth of discharge and state of charge describe different things. If a setting allows 80% depth of discharge, the simple complementary figure is 20% remaining; this arithmetic is an explanation, not a recommendation for your device. The displayed controls and usable reserve must be checked against the model's software.

For example, the linked E3 app guide describes an adjustable DoD control. A hardware brochure's depth-of-discharge figure can describe a rated characteristic rather than the exact range offered by your installed app. Read the field label before entering a percentage, and record whether the field asks for discharge depth, minimum charge or a reserve. Confusing these can reverse the intended result.

What to check or record

1. Read whether the field asks for DoD, minimum SoC or reserve.
2. Use only the range offered and documented for the model.
3. Check the resulting stopping point during ordinary operation.

A percentage change alone does not identify a failed battery or a required reset.

Treat state of charge as a reported battery estimate and investigate it alongside energy flow and alarms. Capture what happened just before the change: charging or discharging, power, temperature, module count and firmware. If the event follows an expansion or update, include that timing in the report.

Do not assume that a forum explanation about calibration applies to every revision. Avoid deliberately forcing deep discharge or writing undocumented battery registers as a general remedy. A useful support report shows a time series and the actual energy exchanged, rather than only two percentages. The manufacturer can then decide whether the behaviour needs a documented calibration procedure, firmware action or hardware assessment.

What to check or record

1. Save timestamps and before/after SoC screenshots.
2. Compare with charge/discharge energy over the interval.
3. Request the exact model's procedure before attempting calibration.

Use available energy and average load, then allow for reserve and losses.

Start with an energy budget, not only a capacity badge. A simple illustration is 2 kWh available to loads divided by a 0.2 kW average load, giving about 10 hours before allowing for changing demand. This is a calculation example, not a runtime claim for a particular Venus.

Use the actual system's usable energy, present SoC and chosen reserve. Include appliances that cycle or start intermittently, and avoid substituting peak power for average energy use. The E Mini documentation, for example, lists capacity and AC power separately; those figures answer different questions. A supervised test with the real essential loads gives a more useful planning baseline than an ideal calculation alone.

What to check or record

1. List each essential load and its typical energy use.
2. Calculate using available energy after the intended reserve.
3. Compare the estimate with a measured test under similar conditions.

The actual request, limits and operating conditions determine delivered power.

An advertised maximum does not mean the battery should deliver that power continuously. Ask what the controller is trying to do now. If the home only needs a small amount, a self-consumption system has no reason to use the full rating. If demand is high, investigate the selected limit, battery state and any active warning.

Compare readings taken at the same time. The household meter, battery display and PV inverter may report different points in the system and update at different intervals. Make a short log with mode, demand, battery power and SoC during a steady condition. This gives a clearer diagnosis than increasing several settings at once or comparing screenshots from different minutes.

What to check or record

1. Identify the present mode and requested action.
2. Check saved limits and live warnings.
3. Compare simultaneous readings at clearly identified measurement points.

Measurement compensation and physical three-phase supply are different functions.

The E3 documentation describes single-phase and three-phase-total compensation choices. These concern the measurement used for control. They do not add physical phase outputs to a single-phase unit or prove that three-phase equipment will run during an outage.

Ask the installer to document which phase each battery is connected to and how the meter totals power. Then distinguish grid-connected energy balancing from isolated backup operation. A load on another phase can affect a total measurement while still lacking a suitable backup supply. For a multi-unit system, confirm the manufacturer's supported configuration rather than assuming that three independent units automatically form a coordinated three-phase source.

What to check or record

1. Record the actual battery connection phase.
2. Identify single-phase versus total-power control.
3. Obtain a separate design for any three-phase backup requirement.

Use the model's Backup Power control and verify the actual backup load path.

The linked Venus A, D and E3 app guides each show a Backup Power control in their settings section. Enabling that control concerns the supported backup output. It does not automatically reconnect all the house circuits to the battery.

Before relying on backup, identify exactly which outlet or installed circuits are supplied by it. Start with a modest, non-critical load and follow the unit's commissioning instructions. Record that the output is enabled, the available SoC and any warning. If the control is missing or the screen differs, use the manual for the installed version instead of a screenshot from another model. Leave permanent circuit changes to the installer.

What to check or record

1. Find Backup Power in the correct model's app guide.
2. Identify the actual backup outlet or circuits.
3. Verify behaviour with an appropriate non-critical test load.

Stored energy does not automatically power ordinary house circuits during an outage.

A backup outlet and whole-home backup are different arrangements. Marstek describes SmartBox configurations for supported whole-home applications, while an unmodified plug-in installation may only power loads connected to its designated backup output. The battery can therefore have charge while ordinary household sockets remain without supply.

Use the installation drawing to identify the protected loads. Avoid trial-and-error connections during a real outage. If your requirement is a fridge, router and lights, decide in advance whether these will use a suitable backup outlet or a professionally designed essential-load circuit. The size of the battery alone does not establish that the transfer, isolation and protective arrangements are present.

What to check or record

1. Identify which loads are explicitly connected to backup.
2. Check whether the required transfer equipment is installed.
3. Test the documented arrangement before relying on it.

No. Do not feed the backup output into the public-grid connection.

The E 3.0 manual expressly warns against connecting both Grid and Backup to the city power network. Treat the backup connector as a defined output in the approved system design, not a second grid plug. An improvised lead can create hazardous live contacts or energise wiring that should be isolated.

For whole-home or essential-circuit backup, use the supported transfer and isolation arrangement installed by a qualified professional. Do not try to reproduce that function by switching off a breaker and using an adapter lead. If you inherited an installation and are unsure where backup wiring goes, have its diagram and physical connections checked before enabling or testing it.

What to check or record

1. Keep the Grid and Backup functions clearly identified.
2. Do not use a plug-to-plug backfeed lead.
3. Have any permanent backup wiring verified against an approved design.

Check starting demand as well as the normal running load.

A device can require a brief starting demand above its steady running consumption. Add the loads already operating when the new appliance starts. Then compare the combined requirement with the exact battery's continuous and temporary output specifications; a short peak rating is not a continuous rating.

If backup shuts down, record the alarm and which appliance started. Reduce the connected load and follow the model's recovery instructions. The E3 manual identifies off-grid overpower as a protection condition, so repeated shutdown should be investigated rather than defeated. If a small, known load also causes failure, send the test details to support. Do not assume a larger energy capacity alone solves a power problem.

What to check or record

1. Record the appliance, startup moment and exact warning.
2. Compare continuous and temporary output ratings separately.
3. Retest only within the documented limits and recovery procedure.

That depends on the approved backup topology, not merely on having both products.

A normal grid-connected PV arrangement and an islanded backup system behave differently. The manufacturer FAQ describes particular solar/backup arrangements for named Venus products, with configuration and input limits. Those descriptions should not be generalized to every older Venus generation or every solar inverter.

Ask the installer to confirm where the PV inverter is connected, how the island is formed, how excess PV is handled and what happens when the battery is full. Do not move a PV inverter to a backup socket based only on a forum experiment. If the supported design has not been confirmed, plan backup duration using stored energy alone rather than counting on solar replenishment.

What to check or record

1. Confirm the exact approved solar/backup combination.
2. Ask how a full battery and excess PV are handled.
3. Keep the PV inverter within its own supported operating conditions.

A transfer-time claim is not a guarantee for every load.

Marstek publishes different backup and EPS specifications for different products. These describe the tested product function, but appliance tolerance and the installed system also matter. A computer, network appliance or medical device can have requirements beyond a general home-backup claim.

Identify the permitted interruption and startup needs of the load itself. Test the actual supported arrangement under controlled conditions before depending on it. Where uninterrupted operation is essential, select equipment designed and certified for that requirement with the responsible installer or equipment supplier. Keep a separate record of transition performance and runtime: a fast transfer does not guarantee enough energy for a long outage.

What to check or record

1. Check the exact model's EPS specification.
2. Check the appliance's power-quality requirements.
3. Test transition and runtime as separate acceptance criteria.

Only use a manufacturer-approved parallel backup arrangement.

Individual backup outputs must not be joined with a generic splitter or adapter. Supported multi-unit configurations require defined coordination, protection and connection equipment. The SmartBox documentation distinguishes single-phase and three-phase equipment and sets professional installation requirements.

Start from the actual goal: more energy, more single-phase power or backup on several phases. Those are separate requirements. Give the installer the host models, generations and desired loads, then obtain the matching supported design. An app showing several batteries does not prove that their isolated outputs can run in parallel. Keep the approved drawing with the system record so later additions do not silently change the design.

What to check or record

1. Do not parallel independent outputs with ordinary leads.
2. Confirm host and SmartBox compatibility together.
3. Have the installer document phases, protection and load limits.

Choose the location from the exact manual's mechanical and environmental requirements.

Select a location that can support the actual unit and preserve its required clearances. The E3 instructions specify an upright installation and space for heat dissipation. Other Venus products differ in dimensions and mounting approach, so do not reuse another generation's bracket layout or assume that a thin enclosure is light enough for any wall.

Consider service access, cable routing and a clear route for safe movement. Keep the device away from avoidable heat sources and situations where it could be knocked over or submerged. Before finalising the position, check that required communications also work there. Solve placement and connection requirements together rather than moving the battery into a poor environment solely to improve wireless reception.

What to check or record

1. Check weight, mounting method and support capacity.
2. Use the exact manual's clearances and orientation.
3. Confirm access, cable routing and communications at the proposed location.

An enclosure rating is only one part of the installation conditions.

Some Venus product specifications list IP65. That does not replace the instructions for location, temperature, connections, mounting and severe weather. Check the entire product documentation and the conditions for all connectors, not only the enclosure headline.

Think about the site over a year: sun, splash, standing water, flooding risk, frost, heat and access for service. A covered but poorly ventilated cabinet can create another problem. If the location falls outside the documented conditions, ask the manufacturer and installer for a suitable solution before installation. Do not infer that the rating permits immersion, pressure washing or an arbitrary protective enclosure.

What to check or record

1. Check the installation conditions in addition to the IP rating.
2. Assess seasonal exposure and flooding risk.
3. Keep approved ventilation and connector protection intact.

Storage cannot absorb unlimited energy; the permitted route depends on the design.

When no more energy can be accepted, the system needs another permitted outcome: household consumption, allowed export or generation reduction. The Venus A and D app guides include a Surplus Feed-in control for their direct-PV arrangements. This is a model-specific function and should not be assumed to exist on an E3 AC-only setup.

Read the exact control description and keep it consistent with the installation's export requirements. A separate PV inverter may continue producing even when the battery stops charging; the battery's limit alone is not proof that all site export has stopped. Observe the household meter as well as the battery display when checking full-battery behaviour.

What to check or record

1. Identify whether PV is connected directly or through an existing inverter.
2. Check the exact model's export controls.
3. Verify the site meter when the battery reaches its upper limit.

Check compatibility and the commissioning result before changing battery settings.

Record the host model, each module part number, serial numbers privately, and the physical module count. Compare those with the count and capacity shown after the documented startup procedure. A recognition problem can look like low capacity or no charging, so establish what the system actually sees first.

Do not repeatedly disconnect a live stack or experiment with unsupported combinations. Use the official expansion procedure and ask the supplier whether firmware or module preparation is required for that exact combination. Include clear photos of labels and the app's device-information screen in the support case. Forum reports can suggest what information to collect, but they do not establish a safe universal fix.

What to check or record

1. Compare physical and reported module count.
2. Confirm every module is approved for the host.
3. Use the prescribed isolation and expansion procedure or installer support.

No. They are separately documented products, not just alternative names.

The newer Venus E range contains distinct products. For example, the official E 4.0 page and E Max page advertise different power and energy classes, while the Mini has its own specification sheet. A shared E family name does not make their controls, ports, physical installation or expansion identical.

Use E3 material only for concepts that remain applicable, not as a source of numeric limits for another device. Begin with the correct regional manual and confirm the document title after downloading. When a feature such as SmartBox expansion, direct solar input or EV integration matters, verify it for the exact model and currently supported accessories before planning the system.

What to check or record

1. Choose the document for Mini, 4.0, Max or Pro explicitly.
2. Verify power, energy, connectors and approved accessories separately.
3. Do not transfer E3 settings just because the app looks familiar.

A planning walkthrough for an existing PV system, new direct-PV panels or a residential backup installation.

Start with the task the system must perform. Write down whether you want to store existing solar surplus, connect new panels directly, shift energy by time, support selected emergency loads or supply installed backup circuits. Give each requirement a separate line. A single product can support several uses, but the required equipment and installation may differ.

Next draw the energy path. For existing PV, name the inverter and show its AC connection. For direct PV, identify the product's actual MPPT inputs and leave the electrical array design to the responsible installer. For backup, draw the supported outlet or transfer equipment and the loads it serves. Mark unknowns rather than filling them with an assumption from a similar installation.

Then build a comparison from the exact regional product documents. Keep nominal energy, usable energy, grid-connected power and backup power in separate fields. Record the host and expansion part numbers. The source record should include document revision and the product label: the official D materials, for example, contain differing power figures across older app and newer product documents.

Finish with an acceptance plan. Decide what you will measure to show the system works: correct identification, recognised modules, sensible meter readings, intended mode behaviour and supported backup operation. Save the initial settings and compare readings during stable conditions. Add advanced scheduling or outside automation only after the basic system's behaviour is understood.

Setup inputs

Primary operating goal

Where it is used

Planning record

What to enter or collect

Existing-PV self-consumption, direct PV, time shifting, selected-load backup or installed backup circuits.

Why it matters

The goal determines the required energy path and equipment.

Host identity and document

Where it is used

Product label and official manual

What to enter or collect

Full model, generation, market, firmware and manual revision.

Why it matters

Similar names can cover different capabilities.

Energy and power requirements

Where it is used

Load and energy worksheet

What to enter or collect

Required kWh over the chosen period, plus continuous and startup load demand.

Why it matters

Capacity and output power answer different sizing questions.

What to check or record

1. Confirm architecture and exact model before selecting numerical settings.
2. Have the installation and protection requirements checked.
3. Save a baseline record and define the expected operating tests.

Define the supported loads, reserve and acceptance checks with the installer.

Make a short list of essential loads. Record their normal consumption and any starting demand, then identify the actual source that will power each one. A labelled backup socket serves attached loads; permanent household circuits require the appropriate designed transfer and isolation arrangement. Do not infer coverage from the battery capacity or from an app switch.

Have the responsible installer confirm the product combination, phase arrangement, protection and backup wiring. Where a SmartBox is used, match the exact host generation and SmartBox edition. Include existing solar in the drawing only if its operation in the backup system has been confirmed. Ask what happens when solar production exceeds the loads or when stored energy is exhausted.

Use the matching app guide to identify Backup Power, then record its saved state and the available battery charge. Prepare a controlled test with a modest non-critical load and follow the manufacturer's procedure. The installer should handle tests involving permanent wiring or supply isolation. Observe whether the intended load stays supplied, whether an alarm occurs and whether normal operation returns afterward.

Record the test date, starting and ending charge, load and observed duration. Repeat the assessment when major loads, modules or backup equipment change. Keep transition performance separate from runtime: a successful short transfer test does not establish hours of endurance. For equipment that cannot tolerate interruption, confirm its own requirements and use an appropriately specified backup solution.

Setup inputs

Backup loads

Where it is used

Installation drawing and load list

What to enter or collect

Named appliances or circuits, typical demand and startup needs.

Why it matters

Only designed and connected loads are covered.

Backup function state

Where it is used

Matching model's Backup Power setting

What to enter or collect

Record enabled/disabled state after saving.

Why it matters

An enabled function must still have a valid output path.

Available energy and reserve

Where it is used

Battery status and operating plan

What to enter or collect

Present charge, documented usable energy and the intended reserve policy.

Why it matters

Backup duration depends on energy actually available at the outage.

What to check or record

1. Document the circuits or outlets actually supplied.
2. Confirm backup power limits and starting loads.
3. Follow a controlled model-specific test procedure.
4. Save results and confirm normal operation after the test.

A record-led walkthrough for compatible modules and supported multi-unit arrangements.

First separate two kinds of expansion. Adding compatible battery modules changes the storage attached to a host. Adding complete inverter-battery units changes the number of power converters and may require additional control or connection equipment. Write down which change you intend before ordering accessories.

Collect the host model, generation and firmware together with all existing module identifiers. Use the exact expansion instructions to confirm permitted module types and counts. Ask about any required preparation or firmware compatibility, and check the physical support and access for the expanded installation. Do not rely on matching connector shapes, a family name or equal voltage on a sales listing.

Have the expansion performed using the required shutdown, isolation and connection procedure. This page deliberately does not substitute a generic wiring sequence for the product manual. When an external battery or installed distribution system is involved, the responsible installer should control the electrical work and verify protection and connections.

After commissioning, compare the physical module count with the reported configuration. Check the new energy total, device status and any warnings. Observe a normal charge/discharge period and save a baseline with timestamps. Confirm that the host's AC output limit remains the approved value; more energy capacity does not automatically raise it. If modules are missing from the display or operation is abnormal, preserve the evidence and ask support for the exact combination's procedure rather than cycling or reconnecting packs repeatedly.

Setup inputs

Host and module identifiers

Where it is used

Labels and expansion instructions

What to enter or collect

Full host model, each module type, current count and intended total.

Why it matters

Brand and appearance alone do not establish compatibility.

Acceptance record

Where it is used

App device information and commissioning log

What to enter or collect

Recognised count, energy total, firmware and any warnings after expansion.

Why it matters

This demonstrates that the added storage is actually recognised.

What to check or record

1. Verify every part number and the supported total before purchase.
2. Use the manufacturer-specific preparation and installation procedure.
3. Confirm recognition, capacity and alarms after commissioning.
4. Update the system record and backup/runtime assessment.

Start from Marstek's own download links and match the app to the model manual.

The official download centre links the MARSTEK application in Apple’s App Store and Google Play. Use those links or the QR code supplied with your exact device. A similarly named home-energy application is not evidence of compatibility.

Before installation, compare the store listing with the manufacturer link and check the phone requirements shown by the store. Keep the application version in your commissioning record. If an older guide shows a different icon or screen, compare the guide’s date before concluding that your equipment is missing a feature.

Suggested check: record whether the problem occurs before sign-in, while adding a device, or after opening its dashboard. These are different stages and need different evidence.

What to check or record

1. Open the download link from the official centre.
2. Record phone operating system and app version.
3. Use the manual matching the battery generation.

Check local discovery separately from account access and internet access.

The E3 setup manual adds a nearby device through the application’s device-discovery flow. Complete this stage close to the intended battery, so that you can compare the discovered identity with its label.

Suggested diagnostic sequence: first establish that the device is powered and ready according to its manual. Then check the phone’s Bluetooth availability and the permissions requested by the app. If another phone or installer session is connected, close that session before retesting.

Record the exact point where discovery fails and any message shown. Repeated account deletion or a factory reset changes more than the discovery step and can make the original fault harder to reproduce.

What to check or record

1. Compare the discovered identity with the physical label.
2. Review app permissions on the phone.
3. Capture the discovery error and app version.

A working nearby connection does not prove that remote access or the meter link works.

Bluetooth provides a nearby communication path; the Venus A app manual distinguishes it from Wi-Fi status. The dashboard also shows the meter connection separately. Treat these as separate observations during troubleshooting.

Suggested test: record which status changes when you move away from the device and when you open the meter screen. A fresh battery reading obtained nearby tells you little about whether the meter is supplying current household measurements.

Use timestamps and changing readings as evidence. A familiar number that remains on screen can be old data, so do not diagnose a battery fault from a frozen dashboard alone.

What to check or record

1. Check battery and meter status independently.
2. Note whether readings change and when they last changed.
3. Record whether the issue occurs nearby or remotely.

Check the actual network, credentials and connection stage before resetting the battery.

For the Venus E3 workflow, Marstek requires Bluetooth to remain connected while network credentials are configured. A failure at that stage can therefore have a different cause from a later cloud disconnection.

Suggested checks: verify the selected network name, password and the radio/security modes supported by the exact product. Test signal availability where the battery is installed, rather than using the phone’s signal in another room.

If you change router settings, document the original configuration and alter one relevant setting at a time. Ask the network administrator to check device access rather than disabling the network’s general protections.

What to check or record

1. Keep the required nearby connection active during setup.
2. Confirm the intended network and supported wireless band.
3. Record whether the router assigns the device an address.

Devices can have internet access while local communication is restricted.

The Venus A integration instructions place the phone, meter and battery on the same network for supported third-party meter setup. Being connected to the same router is not, by itself, proof that devices can communicate locally.

As a network diagnostic inference, guest isolation, separate network segments or access rules may block discovery or device traffic even when internet browsing works. Ask the network administrator to inspect the paths required by the documented integration.

Record network names and device addresses, without publishing passwords. A targeted network change is easier to assess than simultaneously replacing the meter, resetting the battery and changing the router.

What to check or record

1. Verify the documented same-network requirement.
2. Ask whether client isolation or segmentation applies.
3. Change one relevant network setting, then retest.

Separate local monitoring, the home network and remote access.

The application can communicate through different paths. A local Bluetooth session may work even when remote access is unavailable. That observation narrows the investigation; it does not establish that every operating function has stopped.

Suggested diagnostic record: note the last successful remote reading, whether other devices at home can reach the internet, and whether the battery and meter show changing readings when checked locally. Distinguish a stopped display from a stopped energy flow.

Internet-loss behaviour can depend on model, firmware, meter and operating mode. Do not rely on a forum report about another generation as a guarantee for your system; verify the applicable manual and test non-critical operation deliberately.

What to check or record

1. Compare local readings with remote readings.
2. Check router and internet availability separately.
3. Record the active mode and exact firmware.

The phone app, battery controller, communication module and meter can have separate versions.

Marstek’s manuals distinguish device firmware from communication-module updates. The phone app is another component. Reporting only “latest version” leaves support unable to identify which part was changed.

Keep a dated screenshot of each version screen available on your equipment. Include the exact model and meter identity, since the same displayed number on two different products need not identify equivalent firmware.

Suggested change log: record the symptom before updating, which component was updated, the resulting version and the outcome of the same test afterwards. This makes a failed update, an unchanged setting and a new behaviour easier to distinguish.

What to check or record

1. Capture every available component version.
2. Record the date and component of each update.
3. Compare one repeatable before-and-after test.

Reopen the version screen and identify which component was actually updated.

The E3 manual treats device firmware and communication-module updates separately and specifies different connection requirements. Check the procedure for the component shown in the update prompt.

After the application reports completion, reopen the device information screen and record the displayed version. A changed communication version does not necessarily mean that the main controller version should change.

If the same update repeatedly reappears, collect the prompt, current versions, connection method and time of the attempt. Use Marstek support rather than repeatedly interrupting power, installing an unrelated firmware file or following a downgrade procedure for another generation.

What to check or record

1. Match the update prompt to its component.
2. Verify the displayed version after completion.
3. Keep power and the required connection stable.

Compare model, app and firmware before copying settings from an older screenshot.

Marstek publishes separate app guides for Venus E3, D and A. Their settings are not identical; a screenshot from one model is not a universal menu map.

Suggested comparison: record the exact page and label before and after the change, along with firmware and app versions. Check whether you are viewing the same physical device, operating mode and user account.

When a value appears different, distinguish its unit, scope and meaning before changing it. An output limit, a tariff input and a battery protection condition serve different purposes. Ask support about an unexplained change rather than restoring a number simply because it appeared in an old screenshot.

What to check or record

1. Compare exact models and guide revisions.
2. Check the unit and purpose of the field.
3. Keep a screenshot of the last known working configuration.

Use the device-sharing permissions provided for the supported model.

The Venus D app guide distinguishes viewing access from controllable access. Choose the level that matches the other person’s role; someone who only needs to see energy readings does not need authority to change operation.

Suggested handover record: list who owns the account, who receives access and who is responsible for changing schedules. Verify the shared device’s identity and test the intended permission from the receiving account.

Do not send your account password or electricity-provider token as a substitute for sharing. Review access when an installer finishes work or a device changes owner, and use the current application’s documented transfer process.

What to check or record

1. Choose viewing or control access deliberately.
2. Test access using the recipient's own account.
3. Review access after a handover.

Check the login server and account before creating a replacement account.

The Venus A manual says that login must use the same server chosen during registration. Check this first when credentials appear correct but the expected account or device list is missing.

Suggested recovery sequence: compare the email address and selected server with your commissioning record, then use the documented password-recovery option if necessary. A device-list problem is different from Bluetooth discovery; preserve that distinction when describing the fault.

Keep verification codes private. If ownership is unclear, record the device serial number for a private support request and ask about the proper account-binding process. Do not repeatedly register accounts to work around an unexplained binding.

What to check or record

1. Check email spelling and the registration server.
2. Use the app's documented password recovery.
3. Share serial numbers only through the appropriate support channel.

First preserve the evidence and check what the selected reset will erase.

The Venus D guide describes reset choices that differ in whether cumulative energy data is retained. Read the actual confirmation on your model before proceeding.

Suggested approach: save screenshots of settings, schedules, versions and the fault. Try to isolate whether the issue concerns the phone, network, meter or battery. A factory reset affects more than a reconnect and can erase useful evidence.

Use a reset when the applicable instructions or support process call for it. Afterward, verify every relevant setting and the measured behaviour again; a successful account login is not sufficient proof that the operating configuration has been restored.

What to check or record

1. Record settings and energy data before a reset.
2. Read the exact erase/retain option.
3. Recheck mode, meter and limits after reconfiguration.

Confirm the exact model's documented interface and assign control deliberately.

The Venus E3 and Venus A app guides include a Local API setting. This establishes that those documented versions expose an interface; it does not establish that every Marstek product, firmware or community integration supports the same commands.

Suggested integration plan: begin with read-only monitoring and compare units, signs and timestamps against the official application. Before allowing control, decide which system owns schedules and operating modes.

Keep the interface on the intended trusted network and follow its current documentation. Do not assume that a third-party integration’s mode names, write frequency or fallback behaviour match the manufacturer’s current firmware.

What to check or record

1. Verify model, firmware and the current API documentation.
2. Validate read-only data before enabling control.
3. Define who controls the battery and how control is returned.

Match the battery integration and the electricity meter interface.

The original Venus C/E reference names CT002 and Shelly Pro 3EM, with CT003 used for compatible P1 installations. Later app guides list additional integration choices. Treat compatibility as a combination of battery generation, firmware and meter model.

Start by identifying whether household power will be measured with installed current sensors or read from the utility meter’s supported data port. Then check the exact integration in the applicable Marstek instructions.

Do not buy solely because two products use Wi-Fi or have similar names. Record the electricity meter model and the required regional interface, and confirm that the selected reader variant supports them.

What to check or record

1. Record battery, reader and electricity-meter model numbers.
2. Check the interface and integration separately.
3. Verify current support before purchasing an alternative meter.

Check the hardware variant; the published documents describe different interfaces.

Marstek’s CT003 product page describes a P1/infrared product. The download centre also supplies a newer CT003 manual labelled SMR-P1, with an RJ12 connector. These references should not be merged into a single universal specification.

Use the label, supplied connectors and manual revision to identify your own reader. An older infrared setup tutorial does not prove that an SMR-P1 unit has an optical head or supports the same electricity-meter protocol.

Suggested purchase check: ask for the exact reader model and compatibility confirmation for your utility meter. Preserve that confirmation with the installation record so a later troubleshooting session starts from the correct hardware.

What to check or record

1. Read the exact reader label and manual revision.
2. Check the physical interface supplied.
3. Do not assume infrared support from the CT003 family name.

Verify its documented power source before changing the battery settings.

The CT003 SMR-P1 manual specifies 5 V / 1 A power via its RJ12 or Type-C connection. It advises external USB power when the reader’s indicator does not light from the meter connection.

Suggested diagnostic sequence: verify the reader variant, the prescribed power source and cable condition. If a splitter or another reader is present, include it in the connection record; do not assume that every splitter supplies power in the same way.

Observe whether loss of power and loss of measurements happen together. If power remains stable but data stops, continue with port activation, meter compatibility and network checks rather than repeatedly replacing the power supply.

What to check or record

1. Use the power arrangement in the reader's manual.
2. Record splitters and other attached readers.
3. Distinguish a restart from a data or network interruption.

Confirm the supported protocol and exact meter instead of guessing.

Marstek’s official FAQs direct users to the CT003 compatibility list. Similar branding or a matching connector does not establish that the reader can decode the data correctly.

Suggested evidence package: photograph the electricity meter’s model label, record the reader model and firmware, and note whether the data port has been enabled by the meter operator where required. Keep any account or customer details out of public posts.

Ask support to confirm the correct supported selection. Incorrect or missing readings can make automatic battery behaviour appear faulty, so resolve measurement validity before tuning charge or discharge settings.

What to check or record

1. Check the current compatibility list.
2. Record exact model and port status.
3. Request confirmation before selecting a substitute model.

CT002 measures through installed sensors and needs professional electrical installation.

Marstek describes CT002 as a DIN-rail meter with three-phase sampling that can also serve a single-phase installation. Its product instructions require an electrician for work inside the distribution board.

Your role in commissioning is to record the intended measurement boundary: the meter should represent the flows needed by the chosen control strategy. Ask the installer to document phase association, sensor direction and the resulting readings.

After installation, compare normal household consumption with the displayed direction and phase values. An app connection confirms communication, not the correctness of the electrical measurements. Do not open the distribution board or move sensors to experiment with a reversed reading.

What to check or record

1. Have the installation and phase mapping documented.
2. Compare direction and phase readings with known loads.
3. Let the electrician investigate wiring or sensor errors.

It is named in Marstek documentation, but check the integration and Shelly profile.

The Venus C/E reference explicitly lists Shelly Pro 3EM. Shelly documents different measurement profiles on this device, so record the selected profile and model when investigating an integration problem.

Suggested verification: first confirm that Shelly’s own readings represent the intended household measurement. Then check that the Marstek integration can discover the meter and receives current values. Fixing a measurement problem and fixing a network problem are separate tasks.

Do not generalise support from Pro 3EM to every Shelly meter. Newer model names, generations and interfaces need their own compatibility confirmation; a similarly named entry in a forum is insufficient.

What to check or record

1. Confirm the exact supported Shelly model.
2. Record its measurement profile and firmware.
3. Compare Shelly values with the values received by Marstek.

Check its local API and the documented local-network setup.

HomeWizard states that external systems need the Local API enabled for each Energy device. Its documented app path is Settings, Meters, the selected meter, then Local API; labels may evolve with app versions.

Suggested checks: first verify live readings in HomeWizard itself. Next confirm the exact supported P1 integration on your Marstek model and that the devices can communicate over the intended local network.

A reader that works in its own cloud app is not proof that its local interface is available to another device. Record the reader identity and addresses, and avoid switching among unrelated meter types merely to force a connection.

What to check or record

1. Verify live P1 readings in HomeWizard.
2. Enable the documented local API where required.
3. Check local-network access and exact integration support.

A sign has meaning only together with the measuring point and direction convention.

Power readings describe a flow at a particular measuring point. First determine whether the screen represents the grid connection, the battery or an individual phase. Those readings are not interchangeable.

Suggested non-invasive check: compare the utility meter’s import/export indication with the app during an ordinary, known change in household consumption. Record the values and timestamps rather than assuming that a minus sign always means a fault.

If a CT-based meter’s direction or phase association appears wrong, have the installer check it. Do not invert values in an automation or increase battery power to hide an unexplained measurement error.

What to check or record

1. Identify the measuring point and sign convention.
2. Compare readings at the same time.
3. Ask the installer to verify suspected sensor or phase errors.

The control reference must match the intended measurement and installation.

The Venus E3 CT screen documents a choice between single-phase and three-phase-sum reference. This selects the measured power used for control; it does not turn a single-phase battery into a three-phase inverter.

Suggested example: a three-phase house can simultaneously import on one phase and export on another. A total and an individual phase therefore answer different questions. Ask the installer which reference matches the approved system arrangement and the intended objective.

Record the selection and verify its effect with normal loads. Do not change it solely because another installation appears closer to zero on its dashboard.

What to check or record

1. Record supply phases and the battery's connected phase.
2. Confirm the intended control reference with the installer.
3. Compare individual phases and total before judging behaviour.

Validate the input measurements before repeating the diagnosis.

The Venus D app manual provides CT auto-diagnosis and a wiring-sequence diagnostic. A failed diagnostic is a reason to inspect the measurement chain, not proof that the battery is defective.

Suggested sequence: check that the correct meter is selected, its readings are current, and its electrical-meter interface or current sensors are configured correctly. Compare the meter’s own values with those received by the battery.

Record the exact error, firmware, active mode and the readings during the attempt. Repeating the same procedure without resolving missing or implausible measurements rarely provides new evidence. Escalate wiring concerns to the installer and compatibility concerns to support.

What to check or record

1. Verify fresh and plausible meter measurements.
2. Record the diagnostic result and operating conditions.
3. Resolve the underlying issue before running the check again.

Find whether power, network access or data decoding fails first.

An offline indication can hide several different failures. Suggested diagnosis starts with a timeline: reader power, network connection, live meter readings and the battery’s meter status.

If the reader itself restarts, investigate its approved power arrangement. If it remains powered but disappears from the network, inspect signal and network access. If it remains reachable but measurements freeze, investigate meter compatibility and the data interface.

These are diagnostic branches rather than promises of a particular fix. Keep one baseline configuration and change one variable at a time. Include the exact reader hardware variant when asking for help, because CT003 documentation covers different revisions.

What to check or record

1. Note the first status that changes.
2. Check power, network and measurements separately.
3. Supply a timestamped failure example to support.

Confirm the supported group arrangement; independent controllers can react to the same measurement.

Marstek’s CT003 product reference describes control of multiple units. That statement still needs to be matched to the battery models, firmware and supported group setup.

Suggested commissioning plan: record every battery, its connected phase, the shared meter and the configured group. Verify the group using modest, ordinary household demand before evaluating full output.

Do not assume that adding two independently configured batteries doubles useful power without coordination. Each controller may respond to changes caused by the other. If performance becomes unstable after adding a unit, compare the group configuration and measurements before changing battery limits.

What to check or record

1. Confirm the documented battery and meter combination.
2. Record group membership and phase allocation.
3. Test the coordinated response after adding a unit.

Choose the objective first, then verify the prerequisites for that mode.

Marstek describes self-consumption as using stored or solar energy for household demand, AI optimisation as price-aware scheduling, and manual mode as user-defined operation. Availability and labels depend on the product.

Suggested choice: start with the behaviour you need to verify. For following household demand, establish valid meter readings. For a repeatable time-based action, define a schedule. For price-based operation, first verify the supported tariff data and region.

Changing mode changes the controller’s objective, so the same battery percentage and house load can legitimately produce different behaviour. Evaluate the active mode against its own inputs rather than expecting every mode to minimise grid exchange at every instant.

What to check or record

1. Write down the intended operating objective.
2. Verify the required meter or tariff inputs.
3. Check which mode is actually active after saving.

Check the saved time, days, action and power as one complete rule.

The Venus D manual defines manual operation through charge/discharge times, power and selected days. A correctly entered power value is only one part of the instruction.

Suggested check: reopen the saved rule and compare the device clock with local time. Confirm the intended weekday and whether the rule requests charging or discharging. Review other enabled rules and any external controller that might change the mode.

Observe a short, supervised test within the installation’s approved limits and battery availability. If the rule is active but the power is lower than requested, record the battery state and limits; a requested power is not a guarantee of available output.

What to check or record

1. Reopen the schedule and check every field.
2. Compare device time with local time.
3. Record active mode and measured power during the interval.

Verify provider, price area, date and the actual price curve.

The Venus A guide requires a region when selecting NordPool and presents provider-dependent AI setup. Treat the provider list in an older screenshot as a dated example, not a guarantee of current availability.

Suggested verification: compare the app’s price curve with the tariff and location intended for this installation. Check the selected date, units and whether any provider authorisation has expired. A market-price curve may differ from the final amount on a customer’s bill.

Record a specific unexpected interval, the app price, battery state and resulting power. That gives support a concrete case to investigate without assuming that the algorithm must charge in every visually cheap period.

What to check or record

1. Confirm provider and applicable price area.
2. Compare the price curve for the same date and unit.
3. Keep provider tokens and account credentials private.

Treat it as an estimate based on the configured prices and recorded energy.

The Venus E3 app guide explains that configured charging and discharging prices are used for profit statistics outside AI operation. Check those inputs before using the displayed amount for a purchasing or performance decision.

An actual bill comparison also depends on the tariff, fees, import/export treatment and the energy that would otherwise have been used. Battery losses and standby consumption affect the result.

Suggested review: compare consistent periods and keep the assumptions visible. Do not multiply a short, favourable day by an entire year or interpret cumulative discharge as automatically equal to avoided grid purchases.

What to check or record

1. Check currency and charging/discharging price inputs.
2. Compare the same dates and energy boundaries.
3. Keep estimated app profit separate from verified bill savings.

Use the effective tariff and operating limits, not the price sign alone.

Marstek describes AI tariff optimisation as considering prices and household energy needs. A negative wholesale price alone does not establish the amount the customer pays or prove that a particular charging action is worthwhile.

Before comparing strategies, obtain the actual import and export terms from the energy supplier, including applicable charges. Then consider available battery capacity, later demand and conversion losses.

Suggested evaluation: examine one complete charge-and-use cycle with consistent energy measurements. Avoid treating a forecast gain as guaranteed income. If the app behaves unexpectedly, preserve the price curve, active mode and battery state for that interval rather than immediately changing protective limits.

What to check or record

1. Use the applicable customer tariff.
2. Check available capacity and later household demand.
3. Evaluate a complete cycle rather than one cheap interval.

A practical sequence for proving account access, device communication and saved settings.

Prepare an installation record before changing software. Record the battery model, serial number, meter variant, app version and all displayed firmware versions. Keep passwords and provider tokens out of that record. Download the applicable manufacturer guides and note their revisions.

Follow the model’s documented account and device-addition process. Verify the physical identity of the discovered device before binding it. Complete the prescribed network setup and give devices names that remain clear when another battery or meter is added. Treat each completed stage as a checkpoint.

Prove the measurements before enabling optimisation. Check whether the dashboard values are current, whether the meter is the intended one, and whether ordinary changes in household use appear where expected. This observational test does not require opening the distribution board.

Save a baseline screenshot of mode, relevant limits, meter selection and versions. If an update is required for the supported setup, record the component and version before and after, then repeat the same simple checks. Do not use a firmware number from an unrelated forum installation as the target.

Finally reopen the settings and confirm that the intended choices persisted. Test local monitoring and the required remote access separately. Keep a short handover note explaining normal behaviour and the information to collect if the system changes.

Setup inputs

Account server and owner

Where it is used

Account setup / handover record

What to enter or collect

The server used for registration and the responsible account owner; never store the password here.

Why it matters

Account identity and device discovery are separate issues.

Software record

Where it is used

App and device information screens

What to enter or collect

App, device, communication-module and meter versions as displayed.

Why it matters

Support needs the component versions, not only 'latest'.

Network and device identity

Where it is used

Commissioning record

What to enter or collect

Recognisable device names, exact models and the intended local network.

Why it matters

It prevents binding or diagnosing the wrong unit.

What to check or record

1. Record model, versions and the manual revision.
2. Follow the documented setup sequence for that model.
3. Verify fresh readings before enabling optimisation.
4. Reopen saved settings and preserve a baseline.

Check the complete measurement chain with observations and installer confirmation.

Identify the measurement chain in order: the household grid connection, electricity meter or current-sensor installation, reader, local communication and the battery’s selected meter. Record exactly what each component measures. A connected icon is only one checkpoint in this chain.

For a data-port reader, verify the matching hardware and interface using its own manual. For a CT installation, obtain the installer’s confirmation of placement, direction and phase association. Treat uncertain electrical measurements as an installation issue to resolve before configuring automatic control.

Suggested functional test: observe the utility meter and app during a normal, modest change in household load. Compare readings at the same time, allowing for their displayed refresh intervals. Record direction, total and any phase values. Avoid using a large new load purely to force an obvious result.

Next compare the reader’s own information with the value used by the battery. If one changes while the other remains frozen, focus on the communication and selected integration. If both change implausibly, revisit the measuring point, phase reference and exact meter compatibility.

Only after the chain is credible should you assess automatic battery response. Record the active mode, available battery energy and installed power limit alongside the grid reading. Preserve one successful example so that a later dropout can be compared with a known baseline.

Setup inputs

Meter identity and interface

Where it is used

Meter setup / installation record

What to enter or collect

Exact reader and utility-meter models, interface and manual revision.

Why it matters

A family name or matching plug does not confirm protocol compatibility.

Measurement boundary and phases

Where it is used

Installer's commissioning record

What to enter or collect

What the meter measures, phase mapping and intended control reference.

Why it matters

Household totals and one-phase readings serve different purposes.

Observed test

Where it is used

Commissioning record

What to enter or collect

Time, known household load change, meter reading, battery reading and active mode.

Why it matters

A repeatable observation is more useful than an isolated screenshot.

What to check or record

1. Document the entire measurement chain.
2. Have electrical mapping confirmed by the installer.
3. Compare current values at the same time.
4. Record one successful automatic-response example.

Turn an operating objective into checkable inputs and a repeatable result.

Write one clear objective first: absorb household solar surplus, follow a defined time schedule, or use supported tariff optimisation. Choose the mode appropriate to that objective in the exact model’s instructions. Avoid tuning several modes simultaneously.

For a manual schedule, prepare a small table of action, start, end, active days and requested power. Check the device clock. Keep power within the installation’s approved configuration and consider the battery energy available at the beginning of the interval. A requested power cannot override a protection or create energy that is not present.

For tariff optimisation, record the chosen provider and price area, then compare the application’s curve with the intended tariff data for the same date. Confirm the unit and currency. Keep provider credentials private and use the supported authorisation flow. Do not assume an older guide’s provider menu is still exhaustive.

After saving, reopen the mode and its fields. Observe a short representative period and capture the actual mode, battery state, grid flow and tariff information together. If the result differs from the objective, isolate which input was missing or different before changing another setting.

Review the result over a meaningful period. Record the assumptions behind any savings estimate, including actual import and export terms. Keep a previous working configuration available so an experiment can be reversed without erasing unrelated settings.

Setup inputs

Operating objective

Where it is used

Mode selection / commissioning record

What to enter or collect

Self-consumption, scheduled operation or supported price optimisation, with a short expected-behaviour note.

Why it matters

The same load can produce different valid responses in different modes.

Schedule inputs

Where it is used

Manual-mode schedule

What to enter or collect

Action, start/end, active days and requested power in the units shown.

Why it matters

Every field contributes to when and how the rule runs.

Tariff reference

Where it is used

Supported tariff configuration

What to enter or collect

Provider, applicable price area, currency, units and any requested customer-price inputs.

Why it matters

A mismatched curve can produce a plausible but inappropriate schedule.

What to check or record

1. Define the objective and select one control method.
2. Check time, days, power and tariff units.
3. Reopen and verify the saved configuration.
4. Compare observed behaviour with a recorded expectation.

Trace the power path before choosing equipment or interpreting the app.

A direct-PV storage system accepts panel DC at marked PV inputs. The B2500 sits on the DC side and supplies a separate compatible microinverter; Jupiter C/E integrates its inverter. An AC-coupled battery instead receives energy through the household AC system. These architectures need different connections and measurements.

Draw your installation as panels → conversion/storage → house. Put the exact model beside every box and mark each connection AC or DC. A household AC output and a PV input are not interchangeable. The drawing also reveals which device's screen should show panel production: a battery cannot necessarily report the generation of a separate rooftop inverter. Use the installation guide for that exact architecture before adding equipment.

What to check or record

1. Identify whether the battery has documented direct PV inputs.
2. Record the separate microinverter, if present.
3. Match every intended connection to the manufacturer's diagram.

The shared family name does not make their capacity, expansion or PV limits interchangeable.

Jupiter C/E and Jupiter C Plus have separate documentation. The C/E specification lists four MPPTs and capacities of 2.56 kWh and 5.12 kWh respectively. C Plus adds a dedicated stack expansion design. These differences matter when choosing panels or additional batteries.

Begin with the model code on the installed unit, not a shortened invoice title or a photograph from a shop. Save its matching specification sheet with your configuration record. If two official web sections disagree, have Marstek or the supplier confirm the limit for the serial number before purchase or connection. A general family FAQ is useful orientation but does not override the applicable installation limits.

What to check or record

1. Photograph the unit's full model label.
2. Use the C/E or C Plus document that matches it.
3. Verify accessories against the exact model code.

There are different B2500 hardware and document versions; use the unit's label.

The official B2500 FAQ acknowledges 1000 W and 1600 W PV-input versions. The current B2500-D product table lists two inputs rated up to 800 W each. An older unit must not be treated as upgraded hardware because a newer product page or app screen looks similar.

Record the physical input rating, hardware identification, serial number and manual revision together. If the label and downloaded manual do not agree, ask the supplier which document applies. Do this before increasing an array or buying an expansion device. Firmware can change controls, but it is not evidence that connectors, current handling or maximum voltage have changed. Treat a forum configuration as a question to verify, not a specification.

What to check or record

1. Read input voltage, current and power directly from the unit label.
2. Compare the correct manual revision.
3. Resolve conflicts before changing the panel arrangement.

Its DC outputs require a compatible microinverter for grid-connected household use.

The B2500 manual describes separate PV inputs and DC outputs to a microinverter. The microinverter provides the conversion to household AC. A battery percentage or DC output indication therefore does not establish that energy is reaching the house.

Check the complete chain when diagnosing output: the storage unit's requested power, the DC link, the inverter's own status and finally household metering. A mismatch at one stage helps locate the issue without changing several controls at once. The inverter's model, startup requirements, supported input range and rated power matter. Do not connect appliances directly to a B2500 PV-style output or assume its energy capacity describes its AC capability.

What to check or record

1. Record the microinverter brand and exact model.
2. Compare its operating status with the B2500 output reading.
3. Use the approved connection and configuration guidance.

Electrical compatibility matters more than the name on the panel.

Marstek's B2500 documentation allows other-brand panels within its stated input requirements. Matching wattage alone is insufficient: the input must also accept the array's voltage and current under the expected conditions. A connector that physically fits does not prove those conditions are met.

Build the comparison from the exact panel datasheet and exact storage-unit manual. Keep open-circuit voltage, operating voltage, short-circuit current and operating current separate. Include panel count and arrangement, since combining panels changes the electrical result. If a seller supplies only a headline watt figure, obtain the complete datasheet before approving the combination. Save the calculation so that a future replacement panel can be checked against the same requirements.

What to check or record

1. Collect the panel model and full datasheet.
2. Check voltage, current and power independently.
3. Have the proposed array arrangement confirmed before connection.

Voc is used for the maximum-voltage check; Vmp describes normal power-producing operation.

Voc is the panel's open-circuit voltage; Vmp is its voltage around the maximum-power point under specified conditions. A controller's working range and absolute maximum input voltage serve different purposes. Passing one check does not mean the other has passed.

Cold-weather voltage correction is part of PV design, because the nameplate value is tied to test conditions. Ask the installer to document the worst-case calculation using the panel's temperature coefficient and the site's design temperature. Do not use the voltage shown during a warm afternoon as proof that winter voltage is safe. Your setup record should retain both the calculated maximum and the expected operating range, with the document used to obtain each.

What to check or record

1. Record Voc and Vmp as separate values.
2. Include the panel temperature coefficient and design temperature.
3. Compare the corrected maximum with the receiving input limit.

Short-circuit current and normal working current are different design values.

Isc describes the short-circuit current of the PV module under stated conditions. Imp describes current at its power-producing operating point. Use the manufacturer's definitions when comparing these values with a storage input; a specification called 'short-circuit current' is not automatically its continuous operating-current allowance.

Bifacial modules need particular care because rear-side light can increase current beyond a simple front-side rating. Have the design include the relevant current corrections, connector ratings and protection requirements. Do not assume that an MPPT will safely limit any oversized array. For troubleshooting, retain the original design values even if the app currently shows low current: low light during a test says little about the array's maximum possible current.

What to check or record

1. Record Isc and Imp independently.
2. Check whether the panel is bifacial.
3. Confirm the maximum-current calculation and component ratings.

The arrangement must pass voltage, current and protection checks for each input.

Series wiring adds panel voltages; parallel wiring adds currents. That is why neither arrangement is a universal solution when adding modules. A Y-connector changes the circuit; it does not add another independent MPPT or raise the receiving port's rating.

Have the proposed arrangement drawn and checked before any connection changes. The review should show the number of panels per branch, the cold-corrected voltage, the maximum current and any required protection. If either limit is uncertain, keep the existing approved arrangement while it is resolved. Do not trial different combinations to see which the app accepts: a visible power reading is not a safety validation, and a protection shutdown is not an acceptable design method.

What to check or record

1. Provide an exact series/parallel diagram.
2. Verify each port's limits, not only the system total.
3. Use compatible rated connectors and installer-approved protection.

Panel direction and shade should be considered in the input layout.

Different illumination produces different electrical operating conditions. Independent MPPT inputs let separate panel groups be tracked independently, within the device's specifications. Jupiter C/E and C Plus advertise four MPPTs, but do not assume that every connector on every product represents a separate tracker.

Record which panels feed each input and when each group receives sun. A morning comparison between an east-facing and west-facing panel is not a meaningful equality test. For a useful diagnosis, compare each group with its own previous performance at similar times and conditions. Have an installer assess mixed-orientation wiring rather than moving connectors experimentally. The same input map will make screenshots and support requests much easier to interpret.

What to check or record

1. Map each panel group to its MPPT.
2. Record orientation and recurring shade.
3. Compare readings at equivalent illumination.

Panel rating, storage input and household output are different limits.

A panel's Wp rating is measured under standard test conditions; it is not a promise of continuous output. The storage controller, battery and inverter also have their own power limits. A high PV-input rating therefore does not imply the same household AC-output rating.

Compare like-for-like readings over a stable interval. Note panel power, battery charging or discharging, and inverter output at the same time. A flat output plateau can be consistent with a configured or hardware limit, while changing output may follow weather or demand. Do not raise a setting merely to match panel nameplate watts. First identify which stage has reached its intended limit and whether surplus is being stored or curtailed.

What to check or record

1. Distinguish Wp, PV watts and AC watts.
2. Record active output limits.
3. Compare simultaneous readings through the energy path.

Voltage alone does not establish that a panel can supply useful energy.

Power depends on both voltage and current. An input may show voltage while the available current is very small, or while the system is not requesting energy. A voltage reading therefore cannot by itself rule out weak illumination, an operating restriction or an input problem.

Start with non-invasive observations: daylight conditions, shading, battery state, operating mode and any warning. Compare both the panel-input view and the energy-flow view at the same time. Recheck under steady daylight rather than judging a single sunrise sample. If the pattern persists despite suitable conditions and an apparent need to charge, save screenshots and have the supplier assess it. Electrical measurements and connector testing should follow the equipment's service procedure.

What to check or record

1. Record voltage, current or watts together where available.
2. Check battery state and active operating mode.
3. Capture a repeatable daylight example for support.

Compare the connected panels and conditions before blaming the input.

Different panels, directions, shading or cable routes can create different readings. First use your input map to identify what each channel actually represents. Two channels are only a useful comparison if the panel configuration and illumination are comparable.

Take a screenshot when conditions are steady and note the time, weather and visible shade. Repeat later to see whether the difference follows the sun or remains tied to one channel. Record warnings and the battery's state at both times. These observations help an installer distinguish an environmental difference from a connection, panel or controller issue. Do not disconnect live PV connectors or swap inputs as an informal test; arrange any electrical isolation and comparison through the specified service process.

What to check or record

1. Compare panel models, count and orientation.
2. Record readings and shade at two suitable times.
3. Escalate a persistent unexplained channel difference with evidence.

A charge-first setting can deliberately postpone output.

The B2500 documentation distinguishes charge-first behaviour from simultaneous charge/discharge behaviour. In the charge-first option, filling the battery takes priority. This can explain a healthy solar-input reading with little or no household output.

Before treating the result as a fault, record the selected charging behaviour and the separately selected discharge mode. Then check the battery percentage, applicable schedule and downstream inverter status. These are separate questions: whether energy is available, whether the controller is allowed to release it, and whether the inverter can use it. Change one relevant control only after confirming its meaning for your firmware. Reopen the setting afterwards and observe the resulting flow under steady conditions.

What to check or record

1. Record the charging mode exactly as displayed.
2. Check discharge permission or schedule separately.
3. Compare B2500 and microinverter readings after a saved change.

A full battery changes where incoming energy can go.

Once storage cannot accept more energy, production depends on the available output path, household demand and surplus/export setting. A battery percentage close to full is not, on its own, enough to determine which control action should occur.

Record the transition rather than only a screenshot afterwards: battery percentage, PV power, output power, household meter reading and the active surplus setting. Check whether the observation repeats under similar conditions. Do not infer a universal firmware defect or expected delay from another owner's report; the model, operating mode and downstream inverter may differ. If surplus handling does not match the exact manual, send the before-and-after record to support rather than repeatedly resetting the device.

What to check or record

1. Record the surplus/export setting and operating mode.
2. Capture the approach to full and subsequent output.
3. Provide model and firmware versions with the event.

The permitted charging temperature can differ from the operating temperature.

The B2500 manual lists charging from 0°C to 50°C, while its operating range extends below freezing. Being within the operating range therefore does not mean unrestricted battery charging is permitted. Apply the limits for your exact model; do not copy this range to all Marstek batteries.

Check measured device temperature when available, surrounding conditions, state of charge and warnings. A panel can generate energy while the battery controller declines to accept it. Plan winter operation around adequate reserve and the manufacturer's storage guidance. Do not bypass low-temperature protection or apply improvised heating. If the temperature reading is implausible or charging remains blocked after conditions recover, retain the readings and request diagnosis.

What to check or record

1. Compare charge and operating temperature ranges separately.
2. Record temperature and any protection message.
3. Escalate an implausible sensor reading instead of overriding protection.

Reserve planning should account for limited replenishment, not only overnight use.

Marstek's B2500 winter advice recommends retaining more energy and pausing discharge when replenishment has been absent for an extended period. The aim is to avoid leaving the battery persistently near empty. Match any numerical reserve recommendation to the relevant model guidance.

Look at several days of generation and consumption rather than a single good afternoon. If the system repeatedly empties before solar input returns, reduce the energy you expect it to supply or increase the appropriate reserve. Record whether the app expresses the control as allowed depth of discharge or retained state of charge: the same number means different things in those two fields. Review the choice again when seasonal conditions improve.

What to check or record

1. Check recent daily solar yield and minimum battery level.
2. Confirm whether the field means DoD or remaining charge.
3. Follow the exact model's winter and storage instructions.

Strong sunlight does not guarantee maximum system output.

Panel performance and equipment temperature are separate issues. A sunny location can heat both the modules and the electronics. Marstek's microinverter manual describes reduced power from inadequate heat dissipation; storage equipment also has specified environmental limits.

Record whether the change follows the hottest part of the day, the battery becoming full, or a configured output limit. Those patterns need different responses. Inspect the installation visually for obstructed cooling space or exposure outside its documented conditions. Do not remove covers or add an improvised enclosure that traps heat. If a recurring temperature warning appears, the installer should reassess placement. A useful support report includes ambient conditions, available device temperatures and the same power readings before and during the reduction.

What to check or record

1. Compare hot-period readings with cooler conditions.
2. Check cooling space against the manual.
3. Record temperature warnings without changing protection limits.

Environmental ratings still need the installation conditions in the manual.

An IP rating is not permission for immersion, flooding, blocked ventilation or any possible weather exposure. The B2500 manual specifically warns against prolonged soaking and calls for protection from direct sunlight. Product placement must satisfy all relevant conditions together.

Consider the location across seasons: standing water, drainage, hot afternoon sun, snow accumulation, cable strain and access for inspection. A place that is dry during installation may collect water in heavy rain. Keep the unit stable and use the manufacturer's approved mounting arrangement. If a shelter is added, it must preserve required airflow and access. After severe weather, visually inspect the surroundings before relying on normal operation; damaged or water-affected equipment needs professional assessment.

What to check or record

1. Check drainage and possible flood level.
2. Preserve the required cooling and inspection space.
3. Follow the exact mounting and environmental instructions.

Similar names do not establish electrical or communication compatibility.

Jupiter C Plus has a dedicated stack expansion battery identified as JC+ B2500 on its product page. The standalone B2500 is a different type of device. Marstek also explicitly states that the C Plus expansion battery does not expand the original Jupiter C/E.

When ordering, compare the full accessory model code with the compatibility list for the main unit. Confirm the required number of modules, supplied connectors and installation instructions. Do not decide from capacity or the word 'B2500' alone. If you already own two products with similar names, send photographs of both labels to the supplier before connecting them. Keeping this evidence with the system record prevents the same confusion when adding capacity later.

What to check or record

1. Record both main-unit and expansion-module codes.
2. Check explicit compatibility for that pair.
3. Obtain the matching expansion instructions before installation.

Only use a documented combination for the relevant hardware and inverter layout.

Marstek publishes several B2500 grouping diagrams and tutorials, matched to the number of storage units, panels and microinverter inputs. The fact that a combination is documented does not make arbitrary output joining or any inverter arrangement acceptable.

Choose the matching diagram before configuring the app. Label each physical unit so the software's assignment can be checked against the installation. Retain the microinverter model and input arrangement in that record. If the diagram does not match your equipment, obtain confirmation instead of adapting it by trial and error. After commissioning, compare both individual-unit and group readings so that a naming or assignment mistake does not hide an inactive unit.

What to check or record

1. Select a documented topology matching all equipment.
2. Label units and match them to app assignments.
3. Check individual and group behaviour after commissioning.

Watts describe the present rate; kWh describe accumulated energy.

A live watt reading is a snapshot, while a daily kWh total accumulates changing power over time. For example, a steady 200 W maintained for five hours represents 1 kWh. The same peak watts reached briefly can contribute very little daily energy.

Use this distinction when deciding whether solar yield or battery performance is unusual. A screenshot at noon cannot establish the day's total, and a daily total cannot show a brief peak or interruption. Record the reporting interval, date and time zone alongside the value. Also check which part of the system the figure describes: panel generation, battery discharge and household import are different quantities. Compare equivalent channels over the same period before calculating a discrepancy.

What to check or record

1. Write the unit beside every recorded value.
2. Use the same time window for comparisons.
3. Identify whether each channel measures PV, battery or grid energy.

Some energy can enter storage, and conversion stages do not have identical measurements.

The system contains more than one measurement point. Solar input may charge the battery while another portion supplies the house; battery energy can then be delivered later. Conversion losses and the device's own consumption also belong in the overall balance.

Compare a complete period with similar battery charge at its beginning and end before judging energy efficiency. Otherwise, a change in stored energy can dominate the apparent difference. Check whether an app total is DC-side or AC-side and whether it includes all units. Avoid subtracting a group total from a single-device total. If a large discrepancy remains, provide the original figures and timestamps so support can determine whether it is a measurement-definition, reporting or equipment issue.

What to check or record

1. Record starting and ending state of charge.
2. Compare corresponding measurement points.
3. Keep single-unit and group totals separate.

First distinguish missing communication from missing power flow.

An app status describes a communication path as well as equipment operation. A stale cloud reading cannot establish present charging or discharge. Marstek's B2500 guidance explains that a short connection interruption can delay data upload.

Record the displayed timestamp and inspect the unit's normal indicators from a safe position. If supported, a nearby Bluetooth connection can help distinguish a remote connection problem from a device that cannot be reached at all. Also compare an independent household meter or inverter reading. Do not interpret yesterday's power figure as a live measurement. If local communication and physical operation both fail, collect the indicator pattern and conditions for support rather than repeatedly re-pairing or erasing the device.

What to check or record

1. Check the timestamp of the displayed data.
2. Compare cloud, supported local connection and physical indicators.
3. Use an independent power reading where available.

Fault codes and light patterns belong to the exact product and firmware.

Marstek's microinverter manual separates grid, PV-input, temperature and equipment faults. A number seen on an inverter should not be decoded using a Venus or B2500 list. Even the same colour can mean different things on different indicators.

Capture the complete message rather than only the number, and identify which device produced it. Record whether it is active or historical and what the system was doing when it appeared. Keep a short timeline if it repeats. That gives the installer a useful starting point without changing grid settings or protective thresholds. Follow the exact manual's user checks; persistent electrical or hardware faults need the authorised service path.

What to check or record

1. Capture code, full text, timestamp and device identity.
2. Use the matching manual's fault section.
3. Record recurrence and operating conditions before escalation.

Record the condition and use the exact recovery guidance instead of trying undocumented button sequences.

A very low battery indication, missing communication and no apparent PV charging can have several causes. The current B2500 manual defines undervoltage indicator behaviour, but a light pattern alone does not identify the full cause or authorise a recovery procedure from another generation.

First record the model, last known charge level, elapsed time, present daylight conditions and indicator sequence. Include any extension unit or group arrangement. Avoid repeated factory resets, which change the evidence and may erase useful configuration. Ask support for the recovery steps matched to that hardware and firmware. Do not improvise an external charger or use a forum's forced-charge sequence without manufacturer confirmation for the exact equipment.

What to check or record

1. Photograph or video the indicator sequence.
2. Record hardware revision and connected equipment.
3. Request model-specific recovery instructions from support.

Collect the panel and input data before deciding how many modules can connect to each tracker.

Start by deciding which product receives the panel DC. A B2500 plus microinverter, an integrated Jupiter system and an AC-coupled battery are different architectures. This worksheet applies to a product with documented direct PV inputs. Identify the exact storage model and revision, and obtain the matching input specification. Do not apply a diagram from another generation merely because the connectors look similar.

Next list the panel model, count and arrangement for every input. The installation designer needs the module's open-circuit voltage, voltage temperature coefficient, operating-voltage range and current data. Cold-weather maximum voltage and expected maximum current must both remain within the receiving equipment's limits. Power rating is a further check, not a substitute for those limits. Bifacial modules and parallel branches require their own current assessment.

Use a simple input map: channel name, connected modules, orientation and shading. Keep the approved diagram beside the calculation. This provides a baseline for diagnosis later: if one input produces less, you can determine what is connected to it and what conditions to expect. It also prevents an unnoticed mismatch when a replacement panel is installed.

Finally, have the installer verify the complete electrical and mechanical design, including protection, connectors, cable routes, mounting and environmental conditions. Commission using the exact product procedure, then record first-run readings with the weather and battery state. The information below is a collection worksheet, not a set of universal values to type into an app. If a required limit is missing or inconsistent, resolve it before connecting the proposed array.

Setup inputs

Storage model and revision

Where it is used

PV input specification and installation drawing

What to enter or collect

Full model code, hardware revision, serial number and applicable manual.

Why it matters

Different generations can have different electrical limits.

Panel electrical data

Where it is used

PV design calculation

What to enter or collect

Panel model, Voc, Vmp, Isc, Imp and relevant temperature coefficients.

Why it matters

The designer must check voltage and current separately from headline watts.

Panel count and arrangement

Where it is used

Each PV input or MPPT

What to enter or collect

Exact series/parallel layout for each input.

Why it matters

The arrangement determines combined electrical values.

Design environmental conditions

Where it is used

Voltage/current calculation and mounting review

What to enter or collect

Site design temperature, orientation, shading and bifacial assumptions if applicable.

Why it matters

Real installation conditions differ from module test conditions.

Receiving input limits

Where it is used

Exact storage-unit manual

What to enter or collect

Maximum voltage, supported operating range, current limits and allowed power per input.

Why it matters

Every applicable limit must pass; a total-system watt figure is insufficient.

What to check or record

1. Match the physical model label to its documentation.
2. Obtain the panel datasheet and per-input diagram.
3. Have voltage, current, protection and mounting checked.
4. Save first-run readings as the system baseline.

Confirm the physical equipment, app selection and actual household output as one system.

Begin with the approved arrangement for the specific B2500 revision and microinverter. Record all connected units and panels. If multiple storage units are present, choose the matching manufacturer topology and label them before software configuration. The installation and isolation work must follow the exact manuals; this walkthrough concerns the information to confirm and the operating observations to retain.

Record the microinverter's brand, model and quantity. The current B2500 manual includes these selections in its configuration flow. Use the actual equipment, not a different model suggested in a forum to obtain a particular power reading. If the installed model is absent or ambiguous, ask support which supported configuration applies. An incorrect selection can make later power comparisons misleading.

Then separate charging behaviour from discharge control. Decide whether solar should prioritise filling storage or allow output alongside charging, using the options actually offered for the firmware. For manual discharge, document the intended time window and power. For automatic operation, use the separately verified meter setup. Keep the intended output within the limits of the complete system.

Verify the result in stable conditions. Record solar input, battery state and flow, B2500 output, microinverter output and household meter direction at the same time. Reopen the saved settings and check they match the plan. A successful app save is only part of commissioning; the observed energy path must also make sense. If it does not, retain the baseline and investigate one stage at a time. Add grouping or advanced controls only when the underlying arrangement and readings are understood.

Setup inputs

Microinverter selection

Where it is used

B2500 microinverter configuration

What to enter or collect

Actual manufacturer, model and installed quantity.

Why it matters

Software configuration must correspond to the physical conversion equipment.

Charging behaviour

Where it is used

B2500 charging settings available in the installed firmware

What to enter or collect

The intended charge-first or simultaneous behaviour, using the exact displayed option.

Why it matters

This influences whether useful solar power first fills storage or also reaches the output.

Expected output record

Where it is used

Commissioning log

What to enter or collect

Requested output, measured B2500 output and measured inverter output with timestamps.

Why it matters

Separate measurements show which stage is behaving differently.

What to check or record

1. Record the approved hardware topology and physical unit labels.
2. Verify the actual microinverter selection.
3. Confirm charging and discharge controls independently.
4. Compare simultaneous readings at storage, inverter and household meter.

Use a repeatable observation sequence before changing settings or arranging service.

Define the symptom precisely. 'Not working' can mean no PV input, no battery charging, no household output or no fresh app data. Choose one of those statements and record when it started. Add the exact model and revision, firmware, connected equipment and any recent changes. A photograph of the labels and a simple system diagram usually make the description more useful than a long list of attempted resets.

Next establish whether the displayed data is current. Record its timestamp, the unit's visible indicators and a separate inverter or household-meter reading where available. This distinguishes an observation problem from an energy-flow problem. If local communication is supported, compare it with the remote view. Do not assume a stale graph describes the present state.

Then record operating context: daylight, shade, battery level, device temperature if shown, charging behaviour, discharge schedule or automatic mode, and exact warning text. Take a second set of readings under comparable conditions. Ask what changed between the two records. A repeatable pattern around shade, full charge, a schedule boundary or temperature is much easier to assess than isolated screenshots.

Only after collecting that baseline should a relevant user setting be changed, and only within documented limits. Save the original value, make one change, reopen the setting and observe the result. Electrical isolation, voltage measurements and connector or wiring tests belong to the authorised procedure. Persistent faults, implausible sensor values or physical damage require service assessment. Send support the compact before-and-after record and the specific outcome you expected, so it can recommend a targeted next step.

Setup inputs

Symptom and time

Where it is used

Support or installation log

What to enter or collect

Exact symptom, first occurrence, recurrence and timestamps.

Why it matters

The timeline can connect a fault with an operating transition.

Comparable readings

Where it is used

PV, battery, inverter and household-meter views

What to enter or collect

Values and units measured over the same interval.

Why it matters

Unsynchronised snapshots can suggest a fault that is not present.

Change log

Where it is used

Troubleshooting record

What to enter or collect

Previous setting, one deliberate change and observed result.

Why it matters

A controlled comparison preserves a usable baseline.

What to check or record

1. State which measurement or energy path is missing.
2. Capture current readings, device status and timestamps.
3. Record conditions and configuration before making a change.
4. Escalate electrical or hardware faults with the evidence collected.

First establish a real surplus, then separate a control problem from a charging problem.

For a Venus E 3.0, use the grid meter to establish whether the home is actually exporting. Solar production alone is insufficient evidence: appliances may already be using it. For a Venus D with direct PV inputs, also inspect the live PV input power; its direct-PV path and AC surplus are different measurements.

Suggested diagnosis: record the current mode, SoC, warnings, meter value and battery power together. In self-consumption mode, compare the meter’s own live reading with the reading received by the battery. A green connection icon does not establish that the value is current or that the selected phase reference is correct.

If there are no warnings and the battery is within its permitted operating conditions, a brief supervised manual charge scheduled through the model’s documented app controls can help isolate the fault. Use an approved charge power and restore the intended mode afterwards. Manual charging working while self-consumption fails points the next investigation toward measurement and control; neither working requires a broader support assessment. Send the two observations rather than repeatedly resetting.

What to check or record

1. Confirm actual export at the grid meter; on direct-PV Venus D also record PV input watts.
2. Check mode, available charge capacity, warnings and current meter readings.
3. Record whether a permitted manual charge works, including its scheduled time and power.

Remaining SoC is only one condition; check the selected mode, usable reserve and the measured demand.

Start with a simultaneous view of the utility meter and the battery. Confirm that the home is importing and that the battery receives a matching, current demand measurement. A battery percentage above zero does not mean that all of that energy is available: the configured discharge depth or reserve must also be considered.

For Venus E 3.0 and Venus D, the app documents separate self-consumption and manual modes. In manual mode, reopen the active rule and verify its action and time. A charge rule, an inactive discharge period or another controller changing the mode can explain a battery that appears idle.

Suggested diagnosis: note the selected power limit, SoC, warnings and any temperature restriction. If the battery should be available, compare self-consumption with a short permitted manual discharge during ordinary household demand. Stop if a warning appears. If manual output works, investigate the meter reference and automatic control. If it also fails, report both results with firmware and timestamps. A unit repeatedly becoming unresponsive after reaching full charge needs a model-specific investigation, not an improvised workaround to avoid 100%.

What to check or record

1. Compare imported power with the demand received by the battery at the same time.
2. Check reserve, mode, active schedule, power limit and warnings.
3. Report whether the problem happens only at full charge or also in a permitted manual test.

Separate a short response to a changing load from a repeated control oscillation.

A few changing readings immediately after an appliance switches on are different from a regular wave that continues under an almost steady load. Record which pattern occurs. This distinction is more useful than comparing a single peak with somebody else’s screenshot.

Suggested test: watch a few minutes of ordinary, reasonably steady consumption and record grid power, each battery’s power and the meter readings received by the batteries. Mark changes in household demand. Check whether the battery acts on old values, whether the chosen phase reference matches the intended installation and whether an external automation also sends commands.

If the oscillation began after adding another battery or controller, check that arrangement first. Record firmware and meter model before asking support to inspect the control behaviour. The reviewed E3/D manuals do not prescribe a universal polling-rate tweak or a normal oscillation band. A “FAST” setting, delay or register value reported by another owner is therefore not a general remedy.

What to check or record

1. Compare steady-load behaviour with the response immediately after a load changes.
2. Log grid power and each battery on the same time axis.
3. Identify every active controller and ask support to confirm any timing change for the exact model.

A small power reading, a measurement offset and accumulated energy are different questions.

Check whether the value is a brief fluctuation or a persistent baseline. Also establish where it is measured: a whole-house utility meter includes loads that a battery’s own power display does not separately identify. A phase value and a three-phase total are not equivalent.

Suggested comparison: record both instruments during a stable interval, with timestamps and the battery’s operating state. Compare accumulated imported energy over the interval as well as instantaneous watts. For scale, a genuinely continuous 20 W for 24 hours is 0.48 kWh; a 20 W peak lasting a few seconds is far smaller. This arithmetic does not establish a normal value for any Marstek model.

Do not enter an arbitrary negative offset to hide the difference. It can change the intended power flow while leaving the measurement problem unresolved. Ask support whether the exact meter and firmware provide a documented adjustment, and distinguish a meter error from controller response or real household consumption before changing it.

What to check or record

1. Identify the measuring point and whether the value is a total or a phase reading.
2. Compare a steady interval and its accumulated imported kWh.
3. Use only a documented model-specific adjustment after identifying the cause.

Check simultaneous measurements and the supported multi-battery arrangement before changing settings.

First confirm that opposite power flows really occur at the same time. App screens opened one after another can show different moments. If one unit persistently charges while another discharges under steady household conditions, save a combined log and check their modes, schedules, meter sources and phase references.

The Venus E 3.0 hardware manual limits each listed third-party meter model to one device per phase. That is a specific compatibility constraint; the CT003 product page’s multiple-unit claim is not permission to apply every meter arrangement to every battery combination.

Suggested diagnosis: list each unit by serial number, model, firmware, connected phase and controller. Ask the installer or support to check the supported arrangement, especially when mixing generations or using HomeWizard/Shelly with more than one unit on a phase. A manually charging unit and an independently self-consuming unit can pursue incompatible instructions. Confirm a common strategy rather than repeatedly forcing percentages or copying undocumented master/slave settings.

What to check or record

1. Record opposite power flows on the same time axis.
2. Check each unit’s mode, schedule, meter source and connected phase.
3. Verify the exact meter’s permitted number of devices per phase before adding or regrouping units.

Different percentages are not by themselves evidence that the second battery is defective.

Equal nominal capacity does not establish identical starting charge, reserve settings or operation. Compare energy charged and discharged by each battery over the same period, alongside its mode and limits. If one begins fuller, different percentages later are unsurprising; persistent grid import while an otherwise available battery remains unused deserves closer investigation.

Suggested comparison: record both starting percentages, charge/discharge energy, power limits, reserves and schedules for an ordinary operating period. Include the external controller’s priority or sequencing settings if one is installed. The controller may be intentionally operating units differently; verify that against its documentation rather than assuming equal instantaneous output is required.

Keep unequal SoC separate from the cross-charging problem. One battery resting while the other supplies the home is different from sustained energy moving from one battery to the other. The linked Marstek documents do not define a universal equal-SoC tolerance or balancing schedule for every combination. Ask for the supported behaviour for your exact setup before forcing extra cycles or changing battery registers.

What to check or record

1. Compare starting SoC and measured energy over the same period.
2. Check differences in reserve, schedule, power limit and controller priority.
3. Distinguish unequal sharing from simultaneous opposite power flows.

Decide whether the car or the home battery has priority, then coordinate their controls.

The Venus E 3.0 self-consumption function responds to measured household demand and surplus. An EV charger downstream of that measuring point contributes to the household demand. It follows that the home battery may discharge into EV charging, while a surplus-based charger may see less surplus when the battery is charging. That is a consequence of the control objective, not proof of an electrical fault.

Decide the desired sequence: charge the car first, fill the home battery first, or reserve home-battery energy for the evening. Then check which documented settings your battery and charger actually offer. A charger’s supply-load-balancing function alone does not specify the desired battery priority.

Where the standard controls cannot express that priority, ask about a compatible shared energy controller and its exact model/firmware support. Suggested verification: observe one EV session and log PV output, EV demand, home-battery flow and grid power together. Confirm the intended result before leaving an automation in charge; do not copy forum Modbus registers as a general setup procedure.

What to check or record

1. Write down whether car charging or home-battery storage has priority.
2. Check the charger’s control mode and which meter value it uses.
3. Verify the combined result during an ordinary EV charging session.

No such assumption should be made: read the direction and purpose of the specific setting.

For Venus E 3.0, the app manual describes Grid Power Configuration as the maximum discharge limit. It is therefore not evidence of an 800 W charging limit. The product specification separately describes AC input/output capability up to 2500 W. The actual charging request and permitted installation limit still determine what should happen.

The dated Venus D app guide likewise labels its grid-power choice as a discharge limit. Its numerical options differ from some later product material, so use the documentation matching your exact D variant and software rather than transferring the E3 figures.

Suggested check: reopen any manual charge rule and read the requested charge power independently of the discharge setting. Record actual grid import during the scheduled interval and account for other loads on the circuit. Have the installation’s allowed charging and discharging powers confirmed before selecting a higher value. A low discharge setting does not establish that an otherwise shared circuit has enough capacity for every charging request.

What to check or record

1. Read whether each field applies to charge power or discharge power.
2. Inspect the charge power in the saved schedule separately.
3. Confirm circuit capacity for charging together with other loads.

Separate actual standby loss from house consumption, backup loads and a changing charge estimate.

An enabled battery is not necessarily inactive. Self-consumption operation can quietly supply the house, and equipment attached to the backup output can consume energy too. Marstek also identifies standby consumption and low-power operation as factors in real system efficiency. A lower morning SoC alone cannot tell you which of these explains the change.

For a useful overnight check, record the start and end time, SoC, mode, charge/discharge energy, backup-output state and attached loads. Keep the same configuration throughout. Check whether a manual schedule, AI charging or an external controller ran during the interval. Use a suitable installed energy meter when actual energy matters; the SoC display is an estimate, not an independent watt-hour meter.

If you want to compare configurations, change one documented non-essential function at a time and repeat a similar period. Do not disconnect a working meter merely to create an undocumented sleep state. An illustrative constant 10 W load uses 0.24 kWh in 24 hours; this calculation is not a Marstek standby specification. Avoid accepting another owner's percentage loss or watt reading as the normal value for your generation.

If a repeatable large loss remains with no corresponding useful output, send the time record, exact model, firmware and operating state to support. It helps distinguish energy use from a reporting or battery issue.

What to check or record

1. Record backup loads and all active schedules.
2. Compare measured energy over a defined interval, not only SoC.
3. Keep one configuration per comparison period.
4. Escalate a repeatable unexplained loss with the original readings.

Record the operating conditions; a forum recording cannot establish that your unit is normal.

First identify the exact Venus generation and when the sound occurs: a single transition, continuous standby, charging or discharging under load. Owners discuss different sounds on different generations, so a report that another unit is quiet—or that a firmware update helped it—is not a diagnosis of yours. Do not assume every sound is a fan or that every click is a fault.

Make a short recording from a safe position and capture the simultaneous battery power, SoC, mode, room temperature and any warning. Note whether the sound started after moving the unit, adding equipment or updating software. Compare ordinary low and higher loads only within the existing approved setup; there is no need to force maximum output.

The E3 hardware manual requires unobstructed heat dissipation and reserves internal servicing for authorised personnel. Check the external installation and required clearances without opening the housing, modifying cooling or putting the battery in an improvised soundproof box. Ask support to assess a new persistent, scraping or unusually loud sound using the recording and model details. If there is an associated fault or visible damage, follow the model's shutdown instructions before further use.

What to check or record

1. Identify generation, firmware and the operating state that produces the sound.
2. Record sound and status together.
3. Check the external location and ventilation.
4. Have persistent abnormal noise assessed; do not open or modify the unit.

The battery's discharge ceiling does not automatically limit a separate PV inverter.

The E3 app guide defines Grid Power Configuration as the maximum battery discharge power. The E3 is AC-coupled: a separate PV inverter can continue producing electricity independently. Therefore an 800 W battery setting is not, by itself, a whole-installation export limit.

Consider an illustrative moment with 2,000 W of PV generation and 500 W of household demand. If the battery accepts 1,500 W, the balance can be near zero. If it accepts nothing because it is full or another limit applies, the remaining 1,500 W has to be used, curtailed by a supported controller or exported. Changing the battery's discharge ceiling cannot make it absorb that energy.

Compare the utility meter, PV output and battery power at the same time, including the battery's charge state and any warnings. For an installation that requires a firm export cap, have the installer confirm which component controls the PV inverter and how the system behaves when the battery is full, unavailable or disconnected. A self-consumption label and a short successful test are not evidence of a guaranteed installation-wide export limit.

What to check or record

1. Separate the battery discharge setting from the total grid export requirement.
2. Check simultaneous PV, house and battery readings.
3. Verify the full-battery case.
4. Use the documented inverter/controller arrangement for any required export cap.

A readable energy counter does not prove that usable live power is reaching the battery.

Check the unit of the displayed field. A cumulative kWh register tells you energy recorded over time; self-consumption control needs a current power measurement. Successfully reading the first field does not establish that the second field is available, correctly decoded or fresh.

For the infrared CT003 variant, confirm both the exact electricity-meter compatibility and the data output enabled on that meter. For example, the linked eBZ DD3 manual documents restricted versus extended information output; this is evidence that meter-side access matters, not proof that every DD3 revision works with CT003. Obtain any required PIN and the correct instructions from your meter operator. Do not apply an infrared procedure to the newer SMR-P1-only reader.

With an ordinary household load changing, compare the utility meter's own power display, CT003 readings and the values received by the battery. Record timestamps and whether you are viewing through Bluetooth or Wi-Fi. If watts change at the source but freeze downstream, capture that distinction. If watts are absent at the source, resolve meter data access first.

Do not replace missing readings with an assumed zero, or select an unrelated meter model to make configuration finish. Send support the reader revision, utility-meter model, firmware and a short before/after record.

What to check or record

1. Distinguish cumulative kWh from current W.
2. Verify the correct reader variant and exact meter compatibility.
3. Check the meter's documented data-access settings.
4. Compare a known load change at each step of the measurement chain.

On the documented E3 software it disables Bluetooth; it is separate from the account password.

The Venus E3 app guide describes Bluetooth Lock as disabling the device's Bluetooth function. If local discovery stops after enabling it, inspect that saved setting before deleting the account or factory-resetting the battery. This function should not be confused with a phone's Bluetooth switch, device sharing permissions or Wi-Fi credentials.

The same guide says that if re-enabling fails, restart the device; Bluetooth is available for ten minutes after restart to allow connection. Use the model's normal restart procedure and arrange for any connected backup load before restarting. Stay near the intended unit, check its identity, and then verify the setting again. This recovery window is documented for E3; check the corresponding guide before applying it to another family.

Forum reports about older versions disagree about Bluetooth behaviour. Treat them as a reason to verify your exact firmware, not as proof that a particular release is secure or broken. Keep firmware current through the official process, use the intended sharing permissions, and send an unexpected lock or access result to Marstek with the version and steps needed to reproduce it.

What to check or record

1. Confirm that Bluetooth Lock exists in the guide for your model.
2. Check the saved lock state before resetting anything.
3. For documented E3 recovery, connect within ten minutes of a normal restart.
4. Recheck access and the saved setting after recovery.

A fixed charging schedule can draw grid power when solar surplus is insufficient.

The E3 supports manual charge schedules and price-based AI operation as well as self-consumption. A manual charging command specifies when and how much to charge; it is not automatically a solar-surplus command. AI operation can intentionally buy electricity at a selected price.

Use the household energy balance to check the apparent problem. In an illustrative example, PV produces 700 W, the house uses 400 W, and a fixed battery schedule requests 600 W. Only 300 W of solar surplus remains, so approximately another 300 W must come from the grid, ignoring losses. Comparing battery charging with total PV production alone misses the household load.

If solar-only behaviour is the aim, check that the active mode is the documented self-consumption mode and that current meter readings have the correct sign and coverage. Review saved schedules and any external controller or other user that can change the mode. Compare the actual utility-meter import with the battery's reading at the same time; an AC charging indication alone does not identify the energy's origin.

If the battery still imports unexpectedly, capture mode, meter power, PV power, SoC, warnings and timestamps before changing settings. Do not assume that every small charge is a fault, or that a forum's claimed automatic protection threshold applies to your firmware. Have support confirm any unexplained low-SoC or maintenance behaviour for the exact model.

What to check or record

1. Read the active mode, saved schedules and any external control.
2. Calculate solar surplus after household demand.
3. Confirm actual import at the utility meter.
4. Ask support about unexplained protective charging instead of applying another model's threshold.

Check live power, the selected date and the cloud connection separately before changing battery settings.

Start with a live reading and an independent meter or microinverter display. A missing graph does not establish that energy stopped flowing. Note the last time with data, whether only today's total is frozen, and whether earlier days still open. Check that the app is showing the intended device, date and account/server.

For the B2500, Marstek says a short Wi-Fi interruption can delay history uploads: data is buffered and sent after the server connection returns. That statement does not promise unlimited storage or recovery of every historical gap, and it must not be assumed to apply identically to every Jupiter version.

Recommended diagnosis: restore the normal internet connection, reopen the graph, and compare it with the live view. If live values are current but history stays absent, send support the missing interval, local time zone, app version and screenshots of both views. Reports from several owners can help identify a shared service problem, but cannot confirm its cause. Avoid a factory reset solely to repair a graph.

What to check or record

1. Compare a live value with the inverter or household meter at the same moment.
2. Check device, account/server, selected date and last valid history point.
3. Record whether the problem affects one graph, one device or several devices.

Verify the device's time zone and a saved rule against current local time.

The B2500 documentation includes a time-zone setting. An exact one-hour shift is a reason to check time handling before changing output power. Start by noting the expected start and actual start, the local date, and whether daylight saving has just begun or ended. A phone showing the correct time does not prove that the battery uses the same offset.

Recommended check: open the battery's time-zone setting and compare it with your current location. If the app shows a numeric UTC offset, verify the offset that applies today; do not assume that a fixed offset adjusts automatically. Reopen the saved schedule and check its start, end and enabled state.

If the clock looks correct, save one short, non-overlapping test interval at an allowed output while energy is available, then observe the actual start. Keep a screenshot before changing anything. A persistent offset with correct settings belongs in a support report with app/device versions; repeatedly deleting every rule makes the fault harder to reproduce.

Setup inputs

Time zone

Where it is used

B2500 device settings; wording varies by app version

What to enter or collect

Your actual local time zone or today's applicable UTC offset

Why it matters

Schedules must be interpreted against the correct local clock.

What to check or record

1. Write down expected and actual start times, including the date and time zone.
2. Check the battery time-zone setting as well as the phone clock.
3. Verify one simple saved interval without overlapping rules.

Grouping can change which output is active; the app diagram must match the physical installation.

The current SATURN-C B2500 manual specifies OUT1 operation for grouped units. A group is therefore more than a convenient combined name. If OUT2 worked before grouping, its new inactivity can follow the selected topology rather than prove a failed output.

Recommended check: take a screenshot of the selected combination and list each unit's role, connected PV inputs and microinverter connections. Compare these with the exact manufacturer diagram for your equipment. Adding a group in the app does not change the wiring. Do not join DC outputs together or improvise a different connection to recover the missing power.

Also distinguish the group overview from an individual unit's live screen: the manual allows about ten minutes for a new group's first data display. Open each member to check it individually. If the approved arrangement is correct but one unit remains inactive, send support the diagram, member IDs and input/output readings taken together. Any cable changes require the documented shutdown and installation procedure.

What to check or record

1. Compare the selected grouping method with the manufacturer's complete diagram.
2. Record whether the microinverter is connected to the output specified for that arrangement.
3. Check each member separately and allow the documented initial group-reporting interval.

Treat missing expansion capacity as a recognition or communication question before judging battery wear.

First confirm that this is a compatible legacy B2500 with a P2500 expansion module. That arrangement is different from grouping complete B2500 units or stacking a Jupiter C Plus battery. Photograph both labels and record which modules the app currently lists. A green module light alone does not confirm that its capacity is included correctly.

For a matching legacy set in normal condition, Marstek's B2500 FAQ describes switching the main unit off, switching the P2500 off, then starting the main unit so the expansion starts with it. Follow the exact applicable manual for the button timing. It also says to switch the B2500 off before connecting or disconnecting the P2500.

Recommended diagnosis: after the documented restart, compare the module list and total capacity with your previous working record. If the module remains missing, or shuts down again, send both firmware versions, indicator patterns and the time it last worked to support. Do not apply an internet forced-charge sequence or deep-discharge cycle to an unidentified module.

What to check or record

1. Confirm the exact B2500/P2500 compatibility and the applicable legacy manual.
2. Compare the recognised module list and displayed capacity before and after the documented restart.
3. Record both units' indicators and versions if recognition does not recover.

Check the app and verify the stored rule before treating this as a battery fault.

A failed editing screen and a failed discharge instruction are different problems. Start by recording the exact error text and the step that triggers it. After reopening the app, inspect the existing rule rather than assuming that a failed save changed or disabled it. Also check your account's control permission if the field is unavailable instead of crashing.

Recommended sequence: record the app version and phone operating system, check the official app store for an update, then reopen the same device and try one simple rule. Marstek's legacy B2500 guidance directs app updates through the official app stores; an app update is different from battery firmware. Use the current release offered for your phone rather than copying an old version number from a forum.

If saving still fails, stop repeating the command and submit a screenshot or short recording with the versions and intended start/end/power. Check the battery's actual output independently while the editor is unavailable. Preserve working schedules and your setup record; a hardware reset is not a demonstrated remedy for an app editing error.

What to check or record

1. Record the exact error and confirm whether the previous rule remains stored.
2. Check official app updates and the account's control permission.
3. Verify actual battery output independently while editing is unavailable.

Check fresh input and output readings before deciding that the battery or panels have failed.

Confirm that you are viewing current values, then record both PV-input watts, output watts and state of charge together. The B2500's solar input and DC output to a separate microinverter are different paths. Panel voltage alone does not show how much charging power is available, and a microinverter connected to the grid is not proof that the battery is receiving solar energy.

If PV input is present, compare it with outgoing power: the simultaneous charge/discharge mode may be supplying the house, leaving little or no surplus to store. Check the active charging mode and battery warnings. A full battery or a temperature/protection limit needs a different response from an input that always stays at zero. Confirm the applicable operating limits in the manual for your revision.

Recommended check: compare both inputs during a period of stable sunlight, without opening the unit or disconnecting live solar connectors. If both remain near zero, or the unit repeatedly turns off or shows an alarm, preserve the readings and indicator pattern for support. Follow the separate low-charge recovery guidance for a unit that will not wake; do not use an improvised charger or repeated resets as a charging test.

What to check or record

1. Record live PV1/PV2 watts, output watts, SoC and any warning together.
2. Check whether solar power is going to the microinverter rather than accumulating in the battery.
3. Compare behaviour in steady sunlight and use the exact hardware revision's limits.