MG 4 (EH32 platform) + GoodWe ET / EH

Pairing a MG 4 (EH32 platform) pack with a GoodWe ET / EH hybrid inverter through a BMS-EV controller: what the voltage windows allow, which protocol is emulated, and what to check before commissioning.

Direct answer. A complete MG 4 (EH32 platform) pack (~400 V nominal, operating window Varies by chemistry — LFP and NMC variants have different cell voltage limits) pairs with the GoodWe ET / EH (200–800 V DC (ET) / 200–865 V DC (ETC G2) / 85–460 V DC (EH single-phase)) through a BMS-EV controller. The original MG (SAIC) battery management system stays in the pack and keeps executing cell balancing, protection and contactor control. The controller reads its CAN telemetry and re-encodes it as BYD Battery-Box derived frame set over CAN 500 kbit/s.

Verification status: PROTOCOL VERIFIED. BMS-EV builds and bench-tests firmware for this pair against the documented pack protocol and the inverter datasheet before dispatch. There is no publishable field-verified customer installation for this specific pair at the time of writing. See verification levels and Case Studies for what is deployed today.

Voltage window match

Pack nominal voltage	~400 V
Pack operating window	Varies by chemistry — LFP and NMC variants have different cell voltage limits
Inverter battery DC window	200–800 V DC (ET) / 200–865 V DC (ETC G2) / 85–460 V DC (EH single-phase)
Inverter channel note	ET and ETC are three-phase; EH is single-phase with a lower ceiling
Inverter datasheet source	en.goodwe.com ET/ETC series datasheets; emea.goodwe.com EH series

Confirm the actual full-charge and empty voltages of the specific pack you are installing. Pack revisions within a family can shift these figures, and a window that fits on paper can be marginal in practice at the top of charge.

Pack architecture

Variants covered: MG 4 EH32 51 kWh (LFP), 64 kWh (NMC), 77 kWh XPower (NMC)
Cell configuration: Prismatic cells; 51 kWh variant uses LFP, 64 and 77 kWh variants use NMC
Chemistry: LFP (51 kWh) or NMC (64 / 77 kWh) — chemistry differs by trim
Thermal management: Liquid
Source: SAIC MG technical documentation; dalathegreat/Battery-Emulator MG target

Full pack detail: MG 4 (EH32 platform) battery reference page.

Protocol and contactor architecture

Pack side: MG (SAIC) native CAN at 500 kbit/s.
Inverter side: BYD Battery-Box derived frame set over CAN 500 kbit/s.
Contactor control: SAIC pack CAN at 500 kbit/s. The pack BMS retains contactor control; the BMS-EV controller wakes it and reads telemetry.
Controller role: the BMS-EV controller wakes the pack BMS, reads state of charge, cell voltage extremes, temperatures and the BMS-reported charge/discharge current limits, and re-encodes them for the inverter. It does not command cell balancing, does not set its own current limits and does not drive contactor coils.

Protocol background: EV battery CAN communication · GoodWe inverter reference.

Known limitations

Chemistry differs between trims. An LFP 51 kWh pack and an NMC 64 kWh pack need different charge cut-off and taper settings — a single "MG 4" firmware profile is not valid across both. Specify the exact capacity at ordering.
Public teardown coverage of this pack family is thinner than for Tesla, Leaf or i3. Several architecture details are marked NEEDS VERIFICATION on the battery reference page.
Salvage availability in Europe is still building, so pack supply and pricing are less predictable than for older families.
Cable, fuse and disconnect sizing shown anywhere in this documentation is an engineering example. Final sizing must be calculated for the actual pack, maximum current, cable length, installation method, ambient temperature and applicable local standards (IEC 60364-7-712, VDE-AR-N 4105, NEC 690).

Before you order

Confirm the exact pack variant, capacity and model year — firmware differs across variants within this family.
Confirm the exact inverter model, not just the family — battery DC windows differ across models in the same range.
Measure pack state of health and isolation resistance before commissioning. See Safety.
Check that the installation meets the system-level requirements for stationary storage in your jurisdiction. OEM automotive validation of the pack does not carry over to a stationary ESS — see Compliance.

Order this configuration

MG 4 (EH32 platform) + GoodWe ET / EH — firmware configured and bench-tested for this pair

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Last updated: 2026-09-19

Last technically verified: 2026-09-19

Current firmware: 16.5.0

Verification status: PROTOCOL VERIFIED

Technical author: BMS-EV engineering team (Clima Boost Jakub Lipiński, Poland)

Reviewer: Jakub Lipiński, founder/lead engineer BMS-EV

Revision: 2026-09-19 — page created from the canonical compatibility dataset and verified inverter datasheets