Quick Summary (TL;DR)
For a home with a limited electrical supply, choose an EV charger whose own approved load-management system measures the whole property’s current and reduces charging before the main supply limit is exceeded. A CT clampAliExpress price or DIN-rail meter is only useful if it is compatible with the selected charger, correctly positioned, configured for the right phases and supported by a controller with a defined response to missing data. A general Home Assistant energy sensor is excellent for dashboards, but it is not a substitute for an installer-commissioned electrical load-curtailment system.
The practical shortlist is myenergi zappi plus its correctly wired grid CT, Wallbox with a listed energy meterAliExpress price and Dynamic Load Management, Easee with its compatible Equalizer/meter arrangement, and Tesla Gen 3 Wall Connector with Tesla-approved dynamic-power-management metering. These are ecosystem choices, not interchangeable meter kits. Buy for the actual charger model, hardware revision, firmware, number of phases and number of charging points, not simply for a meter’s Modbus label.
Our buying recommendation: start with the charger maker’s installation and compatible-meter list; ask the electrician to document the property’s permitted import current per phase, the CT/meter boundary, the communications link, the minimum charging current, and what happens if a reading disappears. Add Home Assistant afterwards for tariff and solar preferences. Confirm supplier documentation again before ordering because model compatibility and accessories change.
What dynamic load balancing actually does
A domestic wallbox can draw a substantial current for hours, but the EV is not the only load on a property. Showers, ovens, heat pumps, immersion heaters and other equipment can overlap with charging. Static limiting programmes a fixed ceiling into the charger. Dynamic load balancing, also described as dynamic load management, load curtailment or Power Boost depending on the brand, adds a measurement of current at the relevant supply point. The charger or dedicated controller then increases or decreases the current offered to the EV as household demand changes.
It is essential to specify which limit is being protected. A single-charger circuit limit prevents the charger from exceeding its dedicated circuit rating. A grid or service limit prevents all the home’s loads plus EV charging from exceeding an agreed supply capacity. A group limit shares a feeder or supply budget across several chargers. These limits can operate together, but they are not equivalent; a single CT on the EV cable cannot see an oven that is supplied elsewhere.
| Control | What it protects or optimises | Required information | Typical failure if confused |
|---|---|---|---|
| Charger maximum current | Individual EVSE circuit and rated equipment | Commissioned maximum for that circuit | A charger set too high for its installed circuit |
| Dynamic grid or service limit | Whole property’s permitted import current | Total relevant incoming current, normally phase-resolved | EV charging plus household load overloads service |
| Multi-charger group limit | Shared feeder or site capacity | Coordinator plus current allowance for every participating charger | Two wallboxes each assume the full available headroom |
| Solar-surplus charging | Maximises self-consumption and reduces export | Grid import/export measurements and preference logic | Avoids export but does not prove protection of the main fuse |
| Home Assistant scheduling | Uses cheaper tariff periods or forecasts | Software entities, schedules and connectivity | Automation stops when HA or a cloud API fails |
The charger still retains its own certified protective functions, including the protections specified by the manufacturer and installation standard. Dynamic balancing is not permission to omit an appropriate circuit design, overcurrent protection, earthing or residual-current protection. The final design and commissioning should be carried out by a qualified EV-chargepoint installer.
First decide what the meter must measure
The key architectural question is whether the metering point represents the entire supply whose limit is to be enforced. A clamp placed around one outgoing EV circuit measures EV load, not spare supply capacity. A clamp around a solar inverter measures production. Neither can safely replace the intended main incoming grid measurement without a system specifically designed to combine those readings.
With some meter layouts the incomer splits before a convenient consumer unit, so measurement at the wrong board misses part of the property. With solar and a battery, positive and negative active power may change while the distribution board remains heavily loaded; export power in kW must not be mistaken for spare amperes on every individual phase. Your installer should identify the electrical boundary on a one-line diagram before ordering a clamp or meter.
| Measurement method | Typical strengths | Constraints to confirm | Appropriate use |
|---|---|---|---|
| Manufacturer-approved grid CT | Compact, commonly included with an EV charger | CT ratio, orientation, input, cable routing and signal integrity | Single-home load curtailment when the charger approves the arrangement |
| Manufacturer-listed direct-reading DIN-rail meter | Phase-resolved voltage, current and power; consistent digital data | Current rating, meter variant, electrical supply type, protocol, firmware | Homes with appropriate direct-connection capacity and panel space |
| Approved CT-operated three-phase meter | Measures larger services using external CTs | CT ratio, burden, CT-to-phase mapping, meter configuration | Three-phase installations with higher current or complex boards |
| Smart-meter P1/HAN adapter | May avoid adding conventional CTs in supported countries | Country-specific interface, meter activation, adapter and firmware | Ecosystems explicitly supporting the local smart-meter interface |
| General ESP32AliExpress price/Modbus/HA monitor | Rich telemetry, local dashboards, inexpensive experiments | Not necessarily validated as a safety-critical input for the EVSE | Supplementary analysis and energy automations, not the sole service limiter |
A DIN-rail meter advertised as “RS485 Modbus” is not automatically supported by another brand’s charger. Some systems require their specific registers, addresses, data formats, firmware or accessory licence. Buy the model and current-sensor arrangement that the charger manufacturer explicitly lists for your region and device revision.
Which charger, meter and controller combination should you buy?
The following is a compatibility workflow, not a claim that all these devices share one open controller. It is assembled from each maker’s current guidance. A charger with integrated load-management logic still needs the meter or CT that its manufacturer specifies.
| Charger ecosystem | Meter / CT route described by maker | Where balancing decisions live | Important buyer check |
|---|---|---|---|
| myenergi zappi | Grid CT, wired to the appropriate myenergi device; supported wired or harvi arrangements vary by required limit | zappi / linked myenergi devices using Grid Limit and Group Limit | For supply-curtailment approvals, confirm whether the DNO and myenergi require a hardwired grid CT, rather than harvi |
| Wallbox | Wallbox-approved meter for Dynamic Load Management; published model lists include differing single/three-phase devices | Charger and Wallbox EMS configuration | Power Boost and multi-charger Dynamic Load Management need the correct meter and supported feature combination |
| Easee | Easee Equalizer via a supported P1/HAN meter, or Equalizer Modbus Ready with specified third-party meter | Equalizer / Easee charging-site system | Confirm country, electricity-meter port, meter model, 24 V power where applicable and exact Easee site configuration |
| Tesla Gen 3 Wall Connector | Separately purchased Tesla-approved meter for Dynamic Power Management | Wall Connector’s approved power-management setup | A Wall Connector without the dynamic metering accessory can still have a fixed commissioned limit; the two features differ |
| Other OCPP / local EVSE systems | Manufacturer’s dedicated meter, approved controller or documented EMS interface | Could be EVSE, site controller or dedicated CSMS | OCPP capability alone does not prove a safe local load-shedding function or defined lost-meter behaviour |
myenergi zappi: the simplest CT-based starting point?
Myenergi’s documentation distinguishes Device Limit, Grid Limit, and Group Limit. Its grid CT should represent the correct supply boundary and feed the controlling device. Myenergi warns explicitly that correct CT connection is necessary for Grid Limit and load balancing. A harvi wireless sensor may be attractive for difficult cable routes, but certain UK service limits or curtailment arrangements require a hardwired CT; do not assume a wireless retrofit satisfies a network operator’s conditions. Myenergi also states that harvi has a 65 A limit for that configuration whereas the wired approach is needed to exploit higher supply limits.
For a zappi already purchased, the first question is whether its existing grid CT is correctly connected and commissioned, not whether you can save money by buying a generic Modbus meter. For two zappis or a zappi sharing a constrained submain, request a written Group Limit design rather than merely setting two independent device maxima.
Wallbox: match the EMS function to the meter
Wallbox calls its single-charger scheme Dynamic Load Management (DLM), previously widely called Power Boost, and offers a separate multi-charger design. Its support guidance says the feature requires a Wallbox energy meterAliExpress price, and the company’s EMS documentation provides a model-by-model meter table. Examples in that documentation include Carlo Gavazzi EM112 for a single-phase direct meter and EM340 for three-phase use, but not every meter works with every charger, firmware or energy feature. The Wallbox Solar Charging requirements can differ from those for basic dynamic limiting.
A buying quote must specify the meter model, current-transformer set if relevant, communications link, commissioning and how a second wallbox would be added. The installer, not a speculative Home Assistant automation, should configure the controller’s permitted main-supply threshold.
Easee: decide whether P1/HAN or Modbus Ready is viable
An Easee Equalizer can use a compatible smart-meter interface where that country and meter support it. Easee also documents Equalizer Modbus Ready, which uses listed third-party energy meters. Its developer documents distinguish P1/HAN mode from Modbus mode and publish supported external meter types. This is useful for a property without a suitable customer-accessible smart-meter port, but the Modbus kit is not just a universal RS485 dongle: power supply, matching meter and commissioning are part of the design.
Ask whether the utility meter’s P1/HAN port is enabled for the account, and whether the specific Easee charging unit and app/site software in your market support the planned function. Check the relevant product’s current national certification and sales status independently of its software features.
Tesla Wall Connector: static versus dynamic power management
Tesla’s official support page describes Static Power Management as a set maximum and Dynamic Power Management as a live adjustment using a Tesla-approved meter installed separately. A Gen 3 Wall Connector is therefore not automatically dynamic merely because it has Wi-Fi or a current-setting menu. Tesla documentation also describes multi-unit power sharing, but an EVSE-sharing configuration and measurement of other household loads solve different problems. Ask the installer to verify both if the installation has several Tesla connectors on a limited service.
Tesla’s country-specific installation manual controls the exact approved meter and circuit details. Avoid purchasing a third-party energy monitor on the assumption that it can replace Tesla’s supported accessory.
Worked example: a 60 A single-phase supply
Consider an illustrative 230 V single-phase property with a 60 A approved service limit and a commissioned 5 A planning margin. The exact approved limit and required margin must be set by the installer, not copied from this example. The charger itself may be capable of 32 A (about 7.36 kW), but the permissible EV current changes as household loads turn on.
Define the current available to the EV as: available EV current = min(charger limit, service limit − site margin − non-EV household current). The dynamic controller applies its own measurement timing, reserve and safety rules. Current offered to the vehicle may have to be reduced or charging paused where the headroom is below the charger’s allowed operating minimum.
| Household current excluding EV | Spare current after 5 A margin | Commanded EV current, capped at 32 A | Approximate single-phase EV input |
|---|---|---|---|
| 10 A | 45 A | 32 A | 7.36 kW |
| 25 A | 30 A | 30 A | 6.90 kW |
| 40 A | 15 A | 15 A | 3.45 kW |
| 49 A | 6 A | 6 A | 1.38 kW |
| 52 A | 3 A | Pause / withhold charge until sufficient headroom | 0 kW when paused |
The 6 A entry reflects a commonly used minimum AC charging current under IEC 61851-style control, not permission for the installer to override a particular car or charger specification. Below that, the safe outcome may be a temporary pause rather than a fictitious 3 A charge. Several cars also have a delay or minimum-on period when restarting; this affects convenience but does not weaken the electrical limit.
A naïve automation that samples total grid import including the EV and subtracts it from the service limit can create oscillation. A proper controller knows the present charger contribution, derives non-EV load or otherwise applies an approved control algorithm, and deals with measurement delays and hysteresis.
Three-phase: phase current matters more than a single kW figure
Three-phase homes and commercial-sized services require an explicit check of the allowed current on each phase. An overall site power value can conceal a heavily loaded phase, and a wallbox charging symmetrically across all three phases may be limited by whichever phase has the smallest remaining allowance.
Suppose the approved maximum is 60 A per phase, the planning margin is 5 A per phase, and the existing non-EV load is L1 = 40 A, L2 = 20 A, L3 = 32 A. The allowances become 15 A, 35 A and 23 A respectively. A three-phase AC EV drawing the same current from each phase must not exceed 15 A per phase, even though the total allowance seems ample. At 400 V line-to-line, √3 × 400 × 15 / 1,000 ≈ 10.4 kW AC in ideal balanced conditions. A nominal 11 kW charger will be constrained slightly below its 16 A nominal target in this example.
| Phase | Non-EV current | Service ceiling less margin | EV allowance |
|---|---|---|---|
| L1 | 40 A | 55 A | 15 A |
| L2 | 20 A | 55 A | 35 A |
| L3 | 32 A | 55 A | 23 A |
| Balanced three-phase limit | 15 A on each phase |
Single-phase EVs connected on one phase can create different site constraints. Multi-charger products may offer phase rotation or individual-phase allocations, but do not assume this feature exists. The installer must verify the supply arrangement, CT phase order, measurement polarity, neutral loading where relevant, and the charger maker’s rules for switching between one- and three-phase operation. Do not use a total import/export kW figure from a solar dashboard as a safety limit.
Two EVs sharing one incoming supply
When two EVs may charge simultaneously, choose a documented group coordination feature. Setting each charger to 32 A does not provide a 32 A combined limit. Nor will two separate chargepoints, each seeing identical “available current”, necessarily avoid requesting the same headroom.
For example, if other household loads leave 30 A for the two EVs and both vehicles are willing to charge, the coordinator might divide the allocation into 15 A + 15 A, or favour one EV at 24 A and give the second 6 A, depending on the scheme and user priorities. These values are illustrative: the site still needs fixed per-circuit protection, per-phase allowance, minimum-current logic and a tested fallback when one EV finishes or stops accepting current.
| Situation | Questions to ask the supplier | Reason |
|---|---|---|
| Two same-brand chargers | Is group power sharing built in? Does it also observe household demand? | Sharing EV capacity is not always whole-home limiting |
| Two different brands | Is there a manufacturer-approved common site controller? | Each independently calculating headroom may over-allocate it |
| Three-phase charger plus single-phase charger | Are phase-specific allocations supported? | One phase can reach its limit first |
| Cloud-based site controller | What happens if broadband or vendor API goes offline? | A safety-related limit cannot rely on an undefined cloud fallback |
| Future second EV | What extra meter, cabling, gateway or feature licence is needed? | Retrofitting may cost more than planning feeder and data routes now |
Communication links and the all-important failure mode
Meter readings may reach the charger by a dedicated CT lead, wired RS485/Modbus, an approved meter gateway or a supported smart-meter port. The link’s failure behaviour matters as much as whether it supports the correct protocol. An electrician should verify which parts still work if Wi-Fi disappears, a cloud account becomes unavailable, an RS485 device stops responding or a CT is unplugged or reversed.
Look for an explicit manufacturer statement of what the charger does on stale or impossible meter readings: pause charging, impose a documented conservative limit, raise an alarm, or otherwise remain within its fixed commissioned envelope. Do not assume it fails safe without a documented test, and never deliberately unplug a current sensor in a live electrical installation. A suitably qualified installer can carry out safe simulated communication-fault tests according to the manufacturer’s procedure.
For Home Assistant, distinguish supervisory preferences from electrical curtailment. HA can request an earlier charge window, pause charging for a high tariff, show present site import, or choose battery priorities. The wallbox’s commissioned maximum, group power budget and fault handling must remain effective if the Home Assistant host is rebooted, the router is replaced or the integration breaks after an update.
Solar panels and batteries add another measurement boundary
A solar-surplus control usually tries to allocate excess generation to charging rather than export it. Dynamic load balancing instead protects a current limit. Some integrated chargers support both; the same physical meter may feed both features only if the maker supports its installed position and phase configuration.
With a hybrid inverter, a home battery may import, export or discharge at the same moment as EV charging. A meter that sees near-zero net active power is not proof that every phase or conductor is lightly loaded. Equally, exporting 3 kW does not automatically guarantee the EV can charge at 3 kW safely when a constrained phase carries a larger unrelated appliance load. Home Assistant energy dashboards may help verify overall accounting, but manufacturer-certified load limiting takes priority.
A sensible preference hierarchy is: hard electrical limits first, then vehicle departure requirements, then tariff savings and solar self-consumption. If battery charging and the EV compete, choose that preference at the supported charger or energy-system controller rather than implementing an undocumented override to a protective current command.
What should a complete installed quote include?
A “smart load balancing” feature name is not a costed system. Price the complete, locally supported and professionally installed kit, not just a wallbox at a retailer’s headline price. The following basket helps expose the real difference between a CT-based product and a separate meter/gateway ecosystem. Costs are deliberately not filled in with unverified retail prices; obtain dated itemised quotes in your country and currency.
| Quote line | Check before agreeing | Easy-to-miss extra |
|---|---|---|
| EV charger | Exact model and SKU, number of phases, sockets/tether length, warranty | Some variants have different current limits or EMS capabilities |
| Grid CT or approved DIN meter | Exact accessory part number, CT ratio and compatible firmware | “Meter ready” often does not mean meter included |
| Additional gateway / Equalizer | Power supply, supported meter and regional smart-meter interface | Cellular/Wi-Fi gateway, dedicated supply, activation |
| Panel changes | DIN space, protection, earthing, surge or isolator requirements | Larger or relocated consumer unit |
| Cables and communications | CT lead, approved RS485 route, underground or external runs | Installation labour and electrical segregation |
| Commissioning | Documented service threshold, phase mapping, load-step tests | Specialist installer visit or later reconfiguration |
| Multi-charger expansion | Shared group budget, controller, future feeder sizing | Additional licence, gateway or separate charger |
| Ongoing support | Who fixes firmware, app accounts and meter alarms? | Remote subscription, cloud dependence, extra call-out |
Best-value choice depends on the installation: an already compatible zappi with its properly installed grid CT may need little new hardware; a Wallbox or Tesla installation might call for its approved extra meter; and an Easee site may have a suitable P1/HAN interface or require its Modbus Ready arrangement. Any claimed saving disappears if the wrong accessory has to be replaced.
Installation and commissioning checklist
Ask your electrician or chargepoint contractor to provide these points in writing before final acceptance:
- Approved supply limit: what is the property or submain’s permitted current, and does it apply separately to each phase? Has the network operator agreed to the design where notification or approval is required?
- Fixed charger circuit rating: what is the EVSE’s maximum commissioned current, and how do cable, protective devices, RCD/DC leakage protection and earthing meet the local code?
- Measurement boundary: does the meter/CT actually see every load governed by the site current limit? Are solar, battery, garage and other boards included as intended?
- Approved compatibility: what charger model, software version, meter SKU, CT ratio, adapter and communications interface are installed?
- Phase accuracy: do displayed phase currents, CT polarity and any grid import/export sign agree with independent readings in representative conditions?
- Load step: when a large household load switches on, does charging reduce within the maker’s required response characteristics while staying inside the limit?
- Minimum current: does charging pause and recover properly if available current falls below the vehicle/EVSE minimum?
- Communications failure: what documented conservative behaviour occurs for stale data, a failed meter, a lost network connection or a controller outage?
- Two-car test: if several chargepoints exist, does their combined draw stay inside every applicable group and supply limit while either EV starts or stops?
- Handover: does the owner receive the current-limit settings, wiring and meter details, compatibility documents, test record, warranty contacts and a safe procedure for future setting changes?
These are commissioning requirements, not instructions to expose live terminals or install CTs yourself. Meter tails, CT circuits and distribution boards are potentially hazardous; installation, fault simulation and verification belong with a qualified professional working to BS 7671 and local network requirements (or the relevant national standard outside the UK).
Troubleshooting without defeating the electrical limit
| Symptom | Likely category | Safe first response |
|---|---|---|
| Charger always stays at low current | Fixed charger limit, household headroom, car settings or load-limit configuration | Check displayed current budgets and approved installer settings; log when appliances run |
| Charger unexpectedly pauses | Minimum-current threshold, site limit, vehicle delay or lost meter data | Check the wallbox event/alarm history before assuming hardware failure |
| Charging seems faster than approved service allows | Wrong CT boundary, phase mapping, meter configuration or measurement stale | Stop unsafe operation and request urgent installer inspection |
| Grid readings become negative when appliances turn on | Reversed polarity/sign convention or wiring fault | Do not reinterpret negative values as safe extra capacity; ask installer to verify |
| Two EVs exceed the intended combined allowance | No common group controller or incomplete commissioning | Suspend simultaneous charging and commission the correct site scheme |
| HA says “available power” but wallbox refuses to accelerate | Vehicle limit, internal charger protection, approved EMS minimum or battery priority | Trust EVSE protection; diagnose dashboard discrepancy rather than overriding it |
| Balance feature stops after firmware update | Compatibility change or meter connection issue | Check manufacturer notices and seek supported update/recommissioning |
How Home Assistant fits into the system
Use Home Assistant for analysis and non-critical scheduling after the charger’s own dynamic limits have been commissioned. For example, a local energy monitor or a recognised integration can compare peak grid current and EV current by time of day, show whether an inexpensive tariff period was fully used, and prompt the owner when a household appliance repeatedly reduces overnight EV charge rate.
For a local energy-reading project, see our existing guides on ESP32 CT clamp energy monitoring and the ESP32 SDM120/SDM630 Modbus meter. Those are useful observability tools, but should not be silently substituted for the charger maker’s approved load-management meter.
If Home Assistant issues a charging-current preference, treat it as a request that the wallbox can further reduce when its protective logic demands. Avoid repeated setpoint commands that fight the manufacturer’s dynamic limiter. Prefer a read-only dashboard initially, compare the reported numbers against an independent meter, then enable only supported non-safety-critical controls.
Frequently asked questions
Can I use a Shelly, Eastron or ESP32 instead of the supplied meter?
Only if the exact model is expressly supported by the charger maker or by an approved site controller. An energy sensor supplying Home Assistant does not automatically satisfy the wallbox’s required registers, certification, measurement latency or fault handling. Where a supplier lists a particular Eastron or Carlo Gavazzi model, check the exact variant and connection scheme—not just its brand name.
Is solar-surplus charging the same as dynamic load balancing?
No. Solar mode manages when and how much self-generated energy to consume. Dynamic load balancing protects an electrical import or feeder-current limit. Integrated chargers may provide both, but the electrical limits must remain effective regardless of solar conditions or Home Assistant availability.
Will a 100 A-rated CT make my home supply 100 A?
No. A CT rating describes the sensor’s measurement capability in a suitable system. It does not upgrade a service fuse, cable, main switch, authorised import allowance or charger circuit. The controller must be commissioned to the actual approved limit.
Does load balancing work with a three-phase 11 kW or 22 kW charger?
Yes, if the product and approved meter support the site’s three-phase configuration, but the controller must respect per-phase limits. A total kW number alone can conceal an overloaded phase. Vehicle onboard-AC limits may also cap speed independently.
Can two different brands of charger share one current limit?
Only with a documented common controller or compatible integration approved for the installation. Each charger independently seeing the same spare capacity is not adequate coordination. Ask for a tested combined budget and loss-of-controller behaviour before buying a second unit.
What if the Wi-Fi, router or Home Assistant server fails?
The safety-related charger current limit must not depend on an undocumented software or internet link. Confirm the manufacturer’s documented behaviour and have the installer demonstrate the relevant fault response. Some vendor implementations may depend on specific connectivity or firmware; do not assume offline performance from the word “smart”.
Can I reduce my DNO connection requirement by installing a dynamic limiter?
Potentially in a scheme accepted by the network operator and installer, but rules vary. It is not automatic permission to fit a larger EVSE on an unsuitable supply. The operator may specify meter placement, a wired sensor, maximum current and testing conditions.
Is the cheapest meter kit usually the best purchase?
Not necessarily. Compare the installed total including communication hardware, qualified labour, two-car expansion and support. A cheaper unsupported meter can cost more than a supported bundle if troubleshooting requires a return visit or replacement.
Final buying verdict
For one existing home wallbox: first use the charger’s officially supported grid CT or meter arrangement. For a new installation with a tight supply: shortlist chargers on proven whole-site load limiting and a documented fault response before comparing app design or electricity-tariff features. For two EVs or three-phase power: demand group coordination and phase-resolved metering in the written quotation. If you also want Home Assistant, prefer the system that keeps protective decisions inside the approved EVSE/energy controller and exposes clean telemetry to HA.
Do not buy based only on the words “smart meter”, “Modbus” or “load balancing”. Specify the exact meter, controller, electrical boundary, failure mode and commissioning record. Those details determine whether a smart EV charging system is genuinely safe and future-proof.
Official sources and further reading
- myenergi: The Critical Role of Grid CT Sensors — Grid Limit, CT placement and wired/wireless qualifications.
- myenergi zappi installation guide — Device, Grid and Group limits; check for a newer manual for the exact hardware.
- Wallbox: Dynamic Load Management — accessory requirements and commissioning.
- Wallbox: Energy management accessories — supported families and documented installation guides.
- Wallbox: Meter compatibility table — historic reference; validate against your currently supported charger/firmware list before buying.
- Easee: Equalizer Modbus Ready — supported meter arrangements for installations without an appropriate smart-meter interface.
- Easee developer documentation: Configure Meter Type — P1/HAN versus Modbus and listed third-party meter identifiers.
- Tesla: Wall Connector Power Management — static versus dynamic operation and separate approved meter.
Editorial note: This guide describes electrical design choices, not a DIY mains-wiring procedure. Device features, local regulations and compatible meter part numbers may change. Obtain confirmation from an authorised installer and manufacturer for the exact equipment supplied.
