Quick Summary (TL;DR)
The best external energy meterAliExpress price for a hybrid solar inverter is the exact meter-and-current-transformer combination approved for your inverter model, firmware and region. An inverter may need a meter for battery charging decisions, export limitation and grid import/export sensing. A generic Modbus meter can produce excellent Home Assistant graphs yet still be rejected by the inverter or produce incorrect control behaviour.
Start with the manufacturer’s compatibility list, not an online shopping search. For example, Fronius provides Smart Meter TS and other supported families, Huawei documents Smart Power Sensors such as the DTSU666-H, GoodWe supplies GM3000/GM330 configurations, Solis publishes a model-by-model meter/CT matrix, SolarEdge has its own RS485-connected energy meterAliExpress price, and Victron documents supported GX energy meters. Their interfaces, CT secondary currents, installation points and commissioning requirements are not interchangeable.
Why a hybrid solar inverter needs an external meter
A solar inverter already knows how much energy its own power electronics are producing. That does not necessarily tell it what is happening at the property’s connection to the electricity grid. Consider a house with 4 kW of solar production and 5 kW of loads. The grid must supply the remaining 1 kW. If household consumption drops to 2 kW while solar stays at 4 kW, 2 kW can be exported, stored, or curtailed according to the installation’s design and control rules. The inverter must be able to recognise the grid-side change reliably.
An external grid meter sits at a defined electrical boundary and sends signed power, current, voltage or energy readings to the inverter/controller. Depending on the system, it can support battery charging and discharge decisions, self-consumption optimisation, export-power limitation, load monitoring, or grid-failure detection as part of a wider approved control system. Its role is therefore different from that of an optional smart plugAliExpress price or a Home Assistant-only dashboard sensor.
Do not confuse three meters. The utility’s sealed revenue meter is the billing authority; the inverter’s control meter gives the energy system measurements at its designated point; an independent monitoring meter gives you a separate view, perhaps for Home Assistant. They can measure overlapping energy flows, but they do not automatically perform each other’s jobs.
| Meter | Primary role | Common installation point | Can replace the inverter-approved control meter? |
|---|---|---|---|
| Utility revenue meter | Supplier billing and settlement | Utility boundary | Usually no; it is not generally an accessible real-time control input |
| Hybrid-inverter grid meter | Live grid exchange and approved control logic | Main grid connection / point of common coupling | This is the required device or supported equivalent |
| PV production meter | Measures a separate PV inverter or AC-coupled generation | PV AC output | Not when the inverter also needs a grid measurement |
| Independent Home Assistant meter | Historical visualisation and automations | Whole house, sub-board or selected circuit | Only if explicitly approved and configured as the control meter |
Best meter choices by inverter ecosystem
This is a compatibility-led shortlist, not a promise that every device listed works with every inverter sold by that brand. Manufacturers revise protocols and approved parts over time. Confirm the exact inverter model and the latest regional installation manual before purchasing.
| Inverter ecosystem | Manufacturer-documented meter examples | Usual link to control system | Important purchasing check |
|---|---|---|---|
| Fronius GEN24 and supported Fronius systems | Fronius Smart Meter TS 65A-3 / TS 100A-1; other models including Smart Meter IP for supported systems | Model-dependent Modbus RTU or supported IP interface | Exact Fronius compatibility, meter position and region; TS models are not generic Ethernet meters |
| Huawei SUN2000 (supported families) | Huawei DTSU666-H, YDS60-C24, DTSU71 and/or DHSU1079-CT depending on model | Supported RS485 power-sensor connection | Inverter family, firmware, meter variant, CT arrangement and default communications settings |
| GoodWe ET / ET PLUS+ and other supported hybrid families | GoodWe GM3000 or GM330 in documented applications | Manufacturer-specified meter connection | GM3000 fixed matched CTs versus GM330 CT secondary and ratio rules |
| Solis hybrid families | Selected Eastron SDM120CTM, SDM630MCT variants, Acrel and other specified devices | Inverter-specific meter/CT port and interface | Exact Solis S5/S6/RHI/RAI model, variant and CT secondary; 40 mA and 5 A are not the same |
| Victron ESS with GX | VM-3P75CT, ET112, ET340, EM540, EM24 Ethernet and other supported models | VE.Can, Ethernet or RS485-to-GX, depending on model | GX/Venus OS support, grid role, number of phases and connection hardware |
| SolarEdge supported systems | SolarEdge Energy MeterAliExpress price with Modbus connection and compatible CTs | RS485 to inverter or supported gateway | Order CTs separately when required; meter location, approved combination and firmware |
Fronius: choose the Smart Meter family for the site and inverter
For a European three-phase domestic installation, the Fronius Smart Meter TS 65A-3 is a concrete example: Fronius lists a 65 A maximum current and a 208–400 V line-to-line nominal range for the unit. It is a direct-connected meter, not a freely interchangeable CT-input meter. Other Fronius options address single-phase installations, higher currents or IP-based networking. Fronius’s product family distinguishes RS485/Modbus RTU from supported TCP/LAN/Wi-Fi variants; check which meter and port your particular inverter supports.
On a compatible GEN24 system, the primary grid meter is commissioned in the inverter’s device configuration. The official operating instructions explain primary and secondary meter roles and require qualified personnel for configuration. Adding a second meter to the wrong role may make the monitoring picture look plausible while the system uses the wrong boundary for control.
The <a href=”https://www.fronius.com/en/solar-energy/solar-solutions/energy-management/smart-meter”>Fronius Smart Meter overview</a>, <a href=”https://www.fronius.com/en-gb/uk/solar-energy/installers-partners/technical-data/all-products/system-monitoring/hardware/fronius-smart-meter/fronius-smart-meter-ts-65a-3″>TS 65A-3 technical data</a> and <a href=”https://manuals.fronius.com/html/4204260349/index.html”>official meter operating instructions</a> should be your first reference points. Regional sales listings must not override an inverter’s commissioned meter list.
Huawei: buy the right Smart Power Sensor for the SUN2000 family
Huawei’s manuals name different power sensors for different SUN2000 families, including DTSU666-H, YDS60-C24, DTSU71 and DHSU1079-CT in supported contexts. The word “Huawei-compatible” in a shop listing is not enough. Your installer should compare the meter’s full suffix and variant, the SUN2000 model family and software generation, grid topology, and whether the application uses direct measurement or CTs.
The manufacturer documentation stresses phase sequence and default baud-rate requirements for supported meters. A meter that is successfully detected but mapped to the wrong phases can produce misleading negative powers and break export-control calculations. An RS485 adapter for a separate monitoring computer does not necessarily substitute for the inverter’s specified RS485 port or sensor commissioning.
See the <a href=”https://info.support.huawei.com/Energy/info/en_US/all/docView/EDOC1100366802/426cffd9?lang=2″>SUN2000 MAP0 manual</a> and the relevant SUN2000 installation guide for your inverter, plus the matching Smart Power Sensor manual.
GoodWe: GM3000 and GM330 are not the same CT product
GoodWe’s documentation identifies GM3000 and GM330 meter options in supported hybrid systems. A critical difference is the CT arrangement: the GM3000 is documented with a matched 120 A:40 mA CT arrangement that is not intended for arbitrary CT replacement, whereas the GM330 supports specified primary-to-5 A secondary CT ratios within its documented range. Check regional, inverter-family and firmware requirements; do not assume either meter is universally compatible with every GoodWe product.
GoodWe’s <a href=”https://en.goodwe.com/smart-meter”>GM330 product information</a> describes a Class 0.5 device with flexible CT inputs, and its <a href=”https://en.goodwe.com/Ftp/EN/Downloads/User%20Manual/GW_Residential-Smart-Inverter-Solutions_User-Manual-ET12-30kW-EN.pdf”>ET-series documentation</a> explains the difference between meter/CT options. If your installation has AC-coupled PV and hybrid storage, the approved diagram may require more than one meter, each assigned to a different location.
Solis: the compatibility matrix matters more than the badge
Solis is the clearest illustration of why there is no universal winner. Its official compatibility guide lists Eastron SDM120CTM, Eastron SDM630MCT 40 mA, SDM630MCT V2 5 A, and specific Acrel meters against named inverter families. There are even multiple superficially similar SDM630MCT arrangements using different CT secondaries.
A Solis inverter approved for a particular 40 mA CT meter does not automatically work with a 5 A CT version, even though both may say SDM630MCT. Confirm the inverter label and suffix (S5, S6, RHI and so on), supported firmware, meter variant and CT ratio before ordering. Prefer a complete manufacturer-approved kit when available.
Use Solis’s <a href=”https://solis-service.solisinverters.com/en/support/solutions/articles/44002687170-solis-meter-and-ct-compatibility-guide”>Meter and CT Compatibility Guide</a> rather than relying on generic marketplace descriptions.
Victron: use a supported GX meter in the correct ESS role
Victron’s approach is centred on the GX device and Venus OS. Its supported energy-meter range includes the VM-3P75CT, ET112, ET340, EM540 and EM24 Ethernet; Victron’s product page lists the VM-3P75CT with supplied CTs and an 80 A-per-phase maximum, the ET112 at 100 A single-phase, and ET340/EM540 at 65 A per phase three-phase. Link types include VE.Can, Ethernet and RS485, depending on meter. The GX system must reach and correctly identify the meter.
For a Victron ESS with three-phase metering at the grid boundary, VM-3P75CT can be attractive where the supplied CT arrangement fits. For direct-connected applications, ET-series and EM-series options may be more appropriate. Meter role matters: choose grid meter for the grid boundary, PV inverter meter for AC-coupled generation, or AC load meter when that is what is measured. A correctly wired device with the wrong GX role still leads to misleading control data.
Consult the <a href=”https://www.victronenergy.com/meters-and-sensors/energy-meter”>Victron Energy Meters range</a> and its <a href=”https://www.victronenergy.com/upload/documents/Datasheet-Energy-Meters-Selection-Guide-EN.pdf”>Energy MeterAliExpress price Selection Guide</a>. Not every third-party Modbus meter exposes the discovery, sign convention and data roles Venus OS expects.
SolarEdge: RS485 energy meter and matched CTs
SolarEdge supplies an Energy Meter with Modbus connection for production, consumption and import/export monitoring, with supported use for export limitation. The product connects via RS485 to compatible SolarEdge inverters or a gateway. Its product page explicitly says to order current transformers separately where necessary. This is a practical purchasing trap: the meter body can be sold without the CTs needed for your actual installation.
Check the exact SolarEdge inverter, selected meter model, CT aperture/current ratio, wiring diagram, meter configuration and firmware. Meter power-flow measurements can inform both export controls and monitoring. Do not assume a similarly labelled third-party RS485 meter will implement the required SolarEdge-specific configuration. The manufacturer <a href=”https://solaredge.com/en/products/metering-and-sensors/energy-meter-with-modbus-connection”>Energy Meter product page</a> is a useful starting point.
How to choose: a seven-step compatibility check
Step 1 — Photograph the inverter identification label. Record the full model code, market, rated AC power, number of phases and firmware revision. “10 kW hybrid” or “Solis S6” is insufficient. Look for the exact manufacturer’s supported meter/CT list for that variant.
Step 2 — Decide what measurement the inverter needs. The primary requirement is often grid import/export at the point of common coupling. An AC-coupled retrofit may also need a dedicated PV-production meter. A battery or backup sub-board may add more measurements. Draw an annotated single-line diagram before buying.
Step 3 — Match the electrical installation. Confirm single-phase, split-phase or three-phase topology; three-wire versus four-wire configuration; maximum line current; conductor size and enclosure space. A direct-connected 65 A meter cannot simply be used on an installation whose measured conductors can exceed its permitted rating. CT solutions also have aperture and thermal/insulation constraints.
Step 4 — Match the CT secondary and ratio exactly. CT primary ratings might be 100 A, 120 A or 200 A, but secondary outputs might be 40 mA, 100 mA, 1 A, 5 A or a voltage signal. These are different metrology interfaces. Choose the exact manufacturer-approved CT or the approved CT range and configured ratio. Never plug a current-output CT into an input designed for a different secondary.
Step 5 — Confirm the physical communication path. RS485/Modbus RTU, Modbus TCP/Ethernet and vendor-specific wired ports are not equivalent. Check meter-to-inverter cable length and termination, bus address, baud rate, parity, permitted device count and whether an inverter expects the factory protocol/register map. A meter’s ability to speak Modbus is necessary in some systems, but not always sufficient.
Step 6 — Confirm control functions and authorisation. Some inverters merely display third-party meter readings; others require an explicitly approved meter for zero-export, battery dispatch or grid-code compliance. Meter failure may trigger an export-limit fallback, power derating, an alarm or another behaviour—verify it from the current firmware/manual and the grid operator’s conditions.
Step 7 — Commission with actual power flows. Validate import, export and per-phase signs under known household loads and PV conditions. Confirm energy counters move in the expected direction, inverter power commands respond properly, and loss-of-communications behaviour is safe. Have the installer document the configuration.
| Purchasing question | Evidence to obtain | Risk when skipped |
|---|---|---|
| Is my exact inverter supported? | Matching manual page or official matrix entry | Meter not discovered or rejected |
| Is my grid single- or three-phase? | Electrical single-line diagram | Incorrect totals or missing phase |
| Is it direct-connected or CT-operated? | Model datasheet and wiring diagram | Unsafe or unsuitable measurement circuit |
| Which CT secondary/current ratio? | Approved CT part number and ratio | Mis-scaled power or damaged equipment |
| What interface is supported? | Inverter port and protocol spec | RS485/TCP or pinout mismatch |
| Which location/role is required? | Manufacturer configuration diagram | PV and grid flows counted incorrectly |
| Is it approved for export limiting? | Manufacturer and installer confirmation | Grid-code and control failures |
| Who configures firmware and meter parameters? | Installer commissioning record | Inverter reports meter alarms |
Direct-connected meter or external CTs?
A direct-connected meter carries the measured circuit current through its rated terminals. It is compact and straightforward within its limits, but its current rating, conductor sizes and isolation requirements must match the installation. The Fronius TS 65A-3 and Victron ET340 are examples of products with defined direct-connection ratings in their documented contexts. Always have a qualified installer design the connection and protection.
A CT-operated meter senses current through current transformers around selected conductors, while the meter generally needs separate voltage references and power. It can be useful on larger services or installations where physical cable rerouting is undesirable. However, CT-operated systems add important choices: primary rating, secondary signal, burden/input compatibility, orientation, ratio configuration and phase-to-voltage mapping. For example, the Victron VM-3P75CT uses supplied CTs, whereas Solis’s supported Eastron CT variants use model-specific secondaries.
Never install, disconnect or leave open the secondary of a current-output CT while its primary is energised unless using an explicitly designed protective shorting procedure under a qualified electrician’s control. Hazardous voltages can develop. The precise safety method depends on the CT and metering system. An external clamp is not inherently safe to work with inside an energised switchboard.
Why a 100 A label tells you very little
Two products can both be advertised as 100 A and have fundamentally different interfaces:
| Label seen in a listing | What it may mean | Why it is insufficient |
|---|---|---|
| “100 A DIN meter” | Rated direct-through current | Does not identify inverter protocol or phase support |
| “100 A CT” | Maximum CT primary current | Secondary could be 40 mA, 100 mA, 1 A or 5 A |
| “Modbus energy meter” | Supports a Modbus variant | Register map, serial settings and vendor compatibility may differ |
| “Hybrid compatible” | Unspecified compatibility claim | May refer to another inverter family or firmware |
| “Three phase meter” | Measures three phases | Might require 3-wire or 4-wire configuration and correct neutral reference |
Where should the meter be installed?
The most common primary control position is at the point of common coupling, where the property connects to the utility grid. It must encompass the intended house loads and solar/battery branches according to the approved diagram. In more complex installations, the wiring point may be upstream or downstream of a changeover switch or backup board; position determines what remains visible during outages.
An AC-coupled solar-plus-battery setup may have a grid meter plus a PV-generation meter at the separate grid-tied inverter output. GoodWe and other manufacturers document dual-meter scenarios for particular designs. By contrast, a DC-coupled hybrid inverter may already measure DC PV generation internally. Installing a second meter in the wrong location does not improve control accuracy; it creates a second measurement boundary that software can misinterpret.
Check these three examples:
| System | Grid meter sees | Additional measurement often needed |
|---|---|---|
| Grid-tied PV only, no battery | Import from and export to utility | Inverter’s own solar generation counter |
| Hybrid DC-coupled PV + battery | Net exchange with utility | Battery charge/discharge from hybrid controller, if available |
| AC-coupled separate PV inverter + battery inverter | Net exchange with utility | Dedicated PV inverter meter/telemetry for accurate generation and ESS logic |
Wiring, phase direction and commissioning checks
A qualified installer should connect and commission the meter with the inverter powered and isolated as required by the equipment manuals. The details differ significantly between systems, so a universal wiring diagram is inappropriate. The following are verification checks, not instructions to work inside a live consumer unit.
- Confirm voltage reference L1/L2/L3 matches the current sensor for each phase. A CT around L1 paired to a voltage reference for L2 can produce large power-factor errors and false readings.
- Confirm each clamp’s direction. Import/export signs differ by manufacturer and software; compare readings to a known import load and, when available, to observed export. Do not guess direction from a coloured arrow alone.
- Verify the meter configuration: phase topology, address, baud, parity, CT primary/secondary ratios, and whether it is the inverter’s primary grid meter or a secondary PV/load meter.
- Test communications at daytime production and at night. A well-designed hybrid system should meet its prescribed behaviour after a broken meter lead or power outage rather than silently assuming zero exchange.
- Reconcile instantaneous grid power with the meter’s import and export cumulative energy over a measured interval. They should be consistent after accounting for updates, measurement location and sign convention.
- Check any grid export limit under the commissioning procedure approved by the installer and distribution network operator. Home Assistant automation is not a substitute for certified export-control logic.
What about Home Assistant?
You can add a separate, non-invasive monitoring layer for dashboards and analysis, but prioritise the inverter’s approved control path. A meter built for an inverter may share its information through a vendor integration, a local API or a GX system. You do not necessarily need to attach a second serial master directly to an RS485 bus already controlled by the inverter; adding one incorrectly can cause bus contention or unsupported behaviour.
For Fronius, the official <a href=”https://www.home-assistant.io/integrations/fronius”>Home Assistant Fronius integration</a> reads the inverter’s Solar API and supported meters. For Victron, use the relevant GX integration and meter role. For other brands, inspect the officially supported gateway and firmware; avoid writing values to registers used by the inverter for safety or grid control.
If your goal is only to track household consumption and billing, a separate compatible DIN-rail/CT monitoring system may be useful. It can complement the manufacturer-approved inverter meter, but do not create duplicate grid import/export sensors in the Energy dashboard or add PV production to grid import as though both were purchased energy. An existing site guide, <a href=”https://esp32.co.uk/esp32-modbus-energy-meter-home-assistant-sdm120-sdm630/”>ESP32 Modbus Energy Meter with Home Assistant</a>, covers an independent Modbus reading path; <a href=”https://esp32.co.uk/home-assistant-energy-dashboard-troubleshooting-esphome/”>Home Assistant Energy Dashboard Troubleshooting</a> helps diagnose incorrect counters.
A useful division of responsibility is:
| Layer | Recommended responsibility | Not recommended |
|---|---|---|
| Inverter + approved meter | Grid exchange, battery dispatch and export compliance | Replacing with a generic dashboard sensor |
| Manufacturer / GX gateway | Supported protocol bridge and system state | Unsupported serial-bus multi-master experiments |
| Home Assistant | Energy dashboards, trend analysis, load scheduling within safe limits | Safety-critical export enforcement based solely on cloud automations |
| Independent submeter | Separate circuit and appliance breakdown | Counting the same grid energy twice |
Total installed cost: what to budget for
Avoid comparing only the meter’s shelf price. The installed system can involve the meter, the correct matched CTs, an RS485 adapter or cable, protective enclosure space, wiring changes, commissioning time and firmware updates. A quoted kit can sometimes be better value than a cheaper body-only listing whose CT set must be purchased separately.
For a three-phase hybrid installation, request an itemised quotation showing: meter part number and revision; CT quantity, ratio and part numbers; communication cable and termination; switchboard modification; labour; inverter configuration; export-limit verification; VAT; and warranty responsibilities. Ask whether the existing revenue meter or utility CT hardware can be reused legally and technically—do not assume that is permissible.
Example buying decisions
Example A: Fronius GEN24, three-phase, moderate domestic supply. First consult the approved Smart Meter models for the exact inverter and market. The TS 65A-3 may be appropriate if the direct current rating and configuration match. If the supply exceeds its design limit or the meter is installed remotely, investigate the manufacturer’s approved high-current or IP alternatives rather than choosing any third-party Modbus device.
Example B: Huawei SUN2000 plus LUNA battery. Select the documented Smart Power Sensor for the exact SUN2000 family and software version. Ask the installer to verify current sensor, phase mapping, and firmware requirements. A shopping listing that says “DTSU666 compatible” without the required suffix and CT kit is not enough.
Example C: GoodWe hybrid, larger three-phase service. Review whether the inverter’s application requires GM3000, GM330 or another supported configuration. A CT ratio requirement such as nA:5A must match the meter variant. Record the CT scaling at commissioning.
Example D: Solis S6 hybrid with external CTs. Start with Solis’s published compatibility matrix for the full S6 model. Similar Eastron meter names may hide a 40 mA versus 5 A input design. Buy the exact qualified combination, not separate generic parts selected by price.
Example E: Victron ESS, GX gateway, three-phase grid. Compare the VM-3P75CT and supported direct-connected meters based on service current and cabling. Ensure the GX can communicate via the approved interface and configure the unit as the right meter role.
Example F: SolarEdge with export limiting. Choose the specified SolarEdge Energy Meter and suitable CTs; confirm they are included in the quote. Commission direction, phase mapping and export-limit response according to the SolarEdge guide.
Mistakes that lead to expensive rework
Buying before reading the exact inverter manual. An Eastron or Carlo Gavazzi meter may be a fine metering instrument yet incompatible with the inverter’s specified control interface. Use model-level approvals, not general brand reputation.
Confusing the CT primary rating with the output. A 120 A:40 mA clamp and a 120 A:5 A clamp do not have the same secondary. Likewise, a CT configured for 200 A but fitted as 100 A may report twice the expected power.
Assuming Modbus TCP and Modbus RTU are directly interchangeable. A serial-to-Ethernet gateway is not necessarily approved by the inverter or able to preserve discovery behaviour and timing. Only introduce bridges when the manufacturer explicitly permits them.
Metering the wrong branch. If the grid meter excludes EV charging, a backup sub-board or AC-coupled PV, the inverter may make decisions from an incomplete picture. The wiring diagram is as important as the model number.
Using dashboard accuracy as proof of export compliance. Even a meter that agrees with the utility bill over a day may not meet an inverter’s latency, failure-response or regulatory requirements. Grid-export management remains part of the commissioned installation.
Failing to document firmware and CT settings. Subsequent inverter replacements or updates can invalidate assumptions. Photograph labels, keep the meter manual and record all programmed ratios and roles.
Frequently asked questions
Can I use a Shelly Pro 3EM instead of my inverter’s meter?
Only if your inverter manufacturer explicitly supports that exact device and integration for the required control role. Shelly Pro 3EM is a useful independent local monitoring product, but its Home Assistant compatibility does not by itself make it an approved inverter export-control meter. Most hybrid systems should retain their approved meter and use Shelly only when its separate monitoring role makes sense.
Are Eastron SDM630 and SDM630MCT interchangeable?
No. The family includes direct-connected and CT-operated versions, and CT variants can differ by secondary current and protocol/configuration. Solis’s matrix provides concrete examples where an SDM630MCT 40 mA variant and an SDM630MCT V2 5 A variant have different approved inverter lists. Use the exact ordering code and current-transformer specification.
Do I need an MID-certified meter?
For a manufacturer’s inverter-control system, what matters first is the model the inverter supports and any regional regulatory requirements. MID conformity can be important for certain legally regulated measurement or billing applications, but MID certification alone does not prove inverter compatibility, nor does lack of an MID mark automatically make a sensor unsuitable for non-billing telemetry. Ask the installer or metering authority when billing/submetering is involved.
Can one meter monitor both grid and PV generation?
One meter at the grid connection measures net grid exchange, not total behind-the-meter PV generation by itself. The inverter often reports its own PV output. AC-coupled or multi-inverter installations may need an additional production meter. Some hardware supports multiple channels, but that does not eliminate the need to assign each measurement to the correct electrical boundary and system role.
Does the meter have to be connected to the internet?
Usually not for local inverter control when the system uses an approved RS485, VE.Can or local Ethernet connection. However, web monitoring platforms, firmware functions and remote service access may have separate requirements. “Works locally” does not prove an installation will preserve historical data through every outage.
Can Home Assistant issue zero-export commands instead?
Home Assistant can support load scheduling and monitoring, and certain vendor integrations expose bounded inverter setpoints. But a consumer automation server is not a substitute for the manufacturer’s approved grid-code/export-limit mechanism. Follow the local grid operator’s and inverter vendor’s requirements. A communications or server failure must not create an uncontrolled export condition.
Final recommendation
Buy the meter approved for the exact hybrid inverter, then choose its installation method—not the other way around. If you own a Fronius, Huawei, GoodWe, Solis, SolarEdge or Victron system, begin with that vendor’s documented parts and role-specific wiring examples. Check CT secondary and ratio, phase configuration, communications port and grid-export requirements with the installer. Use Home Assistant as the monitoring and optimisation layer, while the inverter’s verified metering and protection remain in charge of power flow.
Official sources and further reading
- <a href=”https://www.fronius.com/en/solar-energy/solar-solutions/energy-management/smart-meter”>Fronius — Smart Meter product range and interfaces</a>.
- <a href=”https://www.fronius.com/en-gb/uk/solar-energy/installers-partners/technical-data/all-products/system-monitoring/hardware/fronius-smart-meter/fronius-smart-meter-ts-65a-3″>Fronius — TS 65A-3 specification</a> and <a href=”https://manuals.fronius.com/html/4204260349/index.html”>operating instructions</a>.
- <a href=”https://info.support.huawei.com/Energy/info/en_US/all/docView/EDOC1100366802/426cffd9?lang=2″>Huawei — SUN2000 MAP0 installation documentation</a>.
- <a href=”https://en.goodwe.com/smart-meter”>GoodWe — GM330 smart meter</a> and <a href=”https://en.goodwe.com/Ftp/EN/Downloads/User%20Manual/GW_Residential-Smart-Inverter-Solutions_User-Manual-ET12-30kW-EN.pdf”>GoodWe hybrid inverter meter/CT documentation</a>.
- <a href=”https://solis-service.solisinverters.com/en/support/solutions/articles/44002687170-solis-meter-and-ct-compatibility-guide”>Solis — official Meter and CT Compatibility Guide</a>.
- <a href=”https://www.victronenergy.com/meters-and-sensors/energy-meter”>Victron — supported energy meters</a> and <a href=”https://www.victronenergy.com/upload/documents/Datasheet-Energy-Meters-Selection-Guide-EN.pdf”>selection guide</a>.
- <a href=”https://solaredge.com/en/products/metering-and-sensors/energy-meter-with-modbus-connection”>SolarEdge — Energy Meter with Modbus connection</a>.
- <a href=”https://www.home-assistant.io/integrations/fronius”>Home Assistant — Fronius integration and meter guidance</a>.
