Tesla Model 3 Battery with GoodWe EH/ET Inverter

GoodWe's residential hybrid inverter families — EH single-phase, ET three-phase, ES / EHB variants — combine mature grid-code approvals across the EU, quiet fanless operation up to 8 kW and one of the cleanest BYD Battery-Box protocol implementations on the market. This page documents the full pairing between a Tesla Model 3 or Model Y pack and every GoodWe series that BMS-EV currently supports.

Direct answer. A complete Tesla Model 3 (or Model Y) pack pairs with the GoodWe EH single-phase 3–8 kW, ET three-phase 5–30 kW, and the ES / EHB variants through the BMS-EV controller, using GoodWe's built-in BYD Battery-Box HVS protocol emulation on CAN at 500 kbit/s. The original Tesla BMS is retained. Choose EH for small single-phase homes, ET for larger three-phase homes and small businesses, ES for the older single-phase 3–5 kW installations, and EHB for the newer high-current backup-optimised residential line. Tesla's 270–410 V window falls inside GoodWe's 180–800 V (ET) and 180–500 V (EH) DC input ranges.

What works, at a glance

All four Model 3 pack variants (LR NCA, SR+ NCA, SR+ LFP, Highland refresh).
Model Y AWD / LR / Performance.
GoodWe EH 3.6/4.6/5/6/7/8 kW single-phase.
GoodWe ET 5/6.5/8/10/15/20/25/30 kW three-phase.
GoodWe ES 3/3.6/4.6/5 kW single-phase (older line, still widely deployed).
GoodWe EHB 5/6/8/10 kW single-phase (backup-optimised).
Grid codes: VDE-AR-N 4105, EN 50549, G98/G99, CEI 0-21, C10/11, NC RfG.
Backup output: full inverter rating on all supported models.
Parallel operation: up to 3 EH units, up to 5 ET units.

Which GoodWe series for which use case?

Series	Phases	Power	DC input	Backup	Typical customer
EH	Single-phase	3.6–8 kW	180–800 V DC	UPS-grade < 10 ms	Small home / apartment, 1-ph grid connection
ET	Three-phase	5–30 kW	200–800 V	< 20 ms	Standard EU single-family, heat pump + EV
ES	Single-phase (older)	3–5 kW	150–450 V	< 10 ms	Retrofit onto existing ES installations
EHB	Single-phase (newer)	5–10 kW	200–500 V	< 4 ms (true UPS)	Homes with critical loads, medical equipment

Supported GoodWe EH models (single-phase 3–8 kW)

Model	AC power	Max PV	Backup	Notes
GW3600N-EH	3.6 kW	4.68 kWp	3.6 kW / 15.6 A	Small apartment, popular UK G98.
GW4600N-EH	4.6 kW	6 kWp	4.6 kW / 20 A	UK G98 max single-phase.
GW5000-EH	5 kW	6.5 kWp	5 kW / 21.7 A	Small home.
GW6000-EH	6 kW	7.8 kWp	6 kW / 26 A	Common DE 1-ph max.
GW7000-EH	7 kW	9.1 kWp	7 kW / 30.4 A	Larger 1-ph home.
GW8000-EH	8 kW	10.4 kWp	8 kW / 34.8 A	Top of single-phase line.

Supported GoodWe ET models (three-phase 5–30 kW)

Model	AC power	Max PV	MPPT trackers	Notes
GW5000-ET	5 kW	6.5 kWp	2	Entry 3-ph.
GW6500-ET	6.5 kW	8.45 kWp	2	Standard family home.
GW8K-ET	8 kW	10.4 kWp	2	Standard 3-ph.
GW10K-ET	10 kW	13 kWp	2	Most popular BMS-EV pairing.
GW15K-ET	15 kW	19.5 kWp	3	Villa with 3-ph heat pump.
GW20K-ET	20 kW	26 kWp	3	Large residential / small commercial.
GW25K-ET	25 kW	32.5 kWp	3	Farm / commercial.
GW30K-ET	30 kW	39 kWp	3	Top of ET range.

Minimum GoodWe firmware: ARM v14 / DSP v25 for ET, ARM v9 / DSP v14 for EH. Older firmware supports fewer BYD Battery-Box variants and may refuse the > 60 kWh capacity that a Tesla LR pack reports.

Battery voltage range — Tesla 270–410 V vs GoodWe 180–800 V (ET) / 180–500 V (EH)

GoodWe's DC input windows are well matched to Tesla:

ET series (180–800 V): full Tesla voltage window fits. BMS-EV enforces a working window of 290–405 V for NCA and 320–383 V for LFP. All rated capacity is usable.
EH series (180–500 V): the 500 V upper limit is above Tesla's 410 V peak, so no clipping at the top. The 180 V lower limit is well below Tesla's 270 V minimum, so no clipping at the bottom. Full usable capacity.
ES series (150–450 V): Tesla's 410 V peak is inside 450 V ceiling, but at very high SoC + high charge current the pack briefly touches 415 V — BMS-EV clamps CCL to keep the pack ≤ 405 V on ES.
EHB series (200–500 V): similar to EH but with a slightly higher 200 V floor — still well below Tesla's 270 V minimum.

CAN protocol — BYD Battery-Box HVS emulation

GoodWe uses the BYD Battery-Box HVS protocol natively (the two companies have a long partnership and GoodWe's factory-integrated storage sold in some markets is a BYD HVS OEM'd for GoodWe). BMS-EV emulates the same protocol, so from GoodWe's point of view a Tesla pack behind a BMS-EV controller is indistinguishable from a real BYD HVS.

CAN ID	Purpose	Source
0x110	Pack voltage (0.1 V units)	Tesla 0x132
0x111	Pack current (signed, 0.1 A units)	Tesla 0x132
0x120	Charge current limit	Computed by BMS-EV from cell V + T
0x121	Discharge current limit	Computed by BMS-EV
0x150	SoC (0.1% units)	Tesla 0x212
0x151	SoH (0.1% units)	Estimated from voltage-vs-coulomb divergence over rolling 30-day window
0x170 / 0x171	Min / max cell voltage (mV)	Tesla 0x352
0x180 / 0x181	Min / max temperature (0.1 °C)	Tesla 0x312
0x190	Alarm bitmask	Derived from Tesla status flags
0x100	BMS heartbeat + operating state	Emitted every 100 ms by controller

CCL/DCL derating (matches SOFAR/Deye targets, calibrated for BYD-style protocol expectations):

NCA CCL: 50 A at 3.9 V/cell → 0 A at 4.10 V/cell.
NCA DCL: 150 A at 3.6 V/cell → 0 A at 3.2 V/cell (adjusted per inverter's own current ceiling).
LFP CCL: 60 A at 3.35 V/cell → 0 A at 3.55 V/cell.
LFP DCL: 150 A at 3.15 V/cell → 0 A at 2.85 V/cell.
All: CCL = 0 below 0 °C, CCL = DCL = 0 above 55 °C.

Wiring architecture

┌───────────────────────────┐ │ Tesla Model 3 pack │ │ 350 V nominal, 75 kWh │ └──────┬──────────┬─────────┘ │ HV+/HV− │ LV connector │ │ (CAN, wake 12 V, HVIL) │ ▼ │ ┌──────────────┐ │ │ BMS-EV │◄── 12 V aux │ │ controller │ │ └──────┬───────┘ │ │ CAN 500 kb (BYD HVS) │ │ via BMS COM RJ45 port │ ▼ │ ┌──────────────┐ └──►│ GoodWe │◄── PV strings │ ET-10K │ │ (or EH/ │ │ ES/EHB) │ └───┬──────┬───┘ │ │ Grid port Backup (BACK-UP) │ │ Grid Critical loads

Installation requirements

Engineering values below are examples. Final conductor cross-section and protective-device 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).

HV DC cabling. 16 mm² for EH 3.6–5 kW; 25 mm² for EH 6–8 kW and ET 5–15 kW; 35 mm² for ET 20–25 kW; 50 mm² for ET 30 kW. Orange sheath, 105 °C rated.
DC fusing. gPV HRC fuses in the positive rail near the pack: 63 A (EH 3.6–5), 100 A (EH 6–8, ET 5–10), 160 A (ET 15–25), 200 A (ET 30).
BMS communication cable. RJ45 straight-through CAT6. GoodWe COM port pinout: pin 4 = CAN-H, pin 5 = CAN-L. Terminator built into inverter (no DIP switch needed).
Meter (Smart Meter). GoodWe ships a GM3000 or GM330 energy meter — install on the grid feed. Do not skip this: without the meter the inverter cannot do self-consumption logic and defaults to feed-in mode.
Backup wiring. BACK-UP port outputs 230 V / 400 V during grid outage. Wire critical loads via a dedicated distribution board section.
Neutral bonding. EH bonds neutral in backup mode automatically. ET requires the neutral relay accessory for TN-S systems.
Grounding. Pack case bonded to main equipotential bar with 16 mm². Inverter chassis has its own ground.
Wi-Fi / LAN / 4G. GoodWe SEMS Portal is the monitoring backend. The included USB Wi-Fi dongle handles most residential installations.
Clearance. EH: 300 mm all sides. ET: 500 mm above, 300 mm sides. Fanless below 8 kW so wall-mount in a utility room is fine.

Commissioning sequence

DC isolator OPEN. Verify HVIL and pack voltage 280–410 V.
Power on BMS-EV controller. Wait for pack-side CAN LED at 1 Hz.
Via GoodWe PV Master app (Bluetooth pairing): Battery → Type = "BYD HVS", Model = "HVS 12.8" (regardless of actual pack — this sets the correct voltage window), Capacity = report from controller (usually 200 Ah).
Close DC isolator. Precharge + main contactors close in ~5 s. Inverter display should show battery online.
Test discharge: block PV, force a house load. Verify AC output rises and SoC drops smoothly on both the inverter display and the BMS-EV controller's HTTP dashboard.
Force a full charge from grid via PV Master (Advanced → Battery → Force Charge). Verify current tapers correctly near 4.05 V/cell.
Register the plant on SEMS Portal for cloud monitoring.

Known limitations

ES series (older): upper voltage limit 450 V requires BMS-EV to cap the pack at 405 V. In practice this means top-of-charge SoC displayed by ES is 98–99% rather than 100%. Cosmetic only.
EHB "true UPS" mode: the < 4 ms transfer only works with the specific EHB firmware ≥ v11. Older firmware behaves like EH (< 10 ms transfer).
Wi-Fi dongle disconnects under some routers with WPA3-only or 5 GHz-only networks. The GoodWe USB dongle is 2.4 GHz WPA2 only. Add a compatible 2.4 GHz SSID.
Cold weather. Below 0 °C the pack refuses to charge; GoodWe displays "Battery is warming up" (misleading — the pack does not actively heat unless you add external heaters).
Grid outage during precharge. If a grid loss happens exactly during the 5 s precharge window, the ET will time out and require a manual restart cycle. EH behaves better and retries automatically.
PV Master app quirks. Battery capacity setting sometimes needs to be entered twice to persist. Verify after configuration by reconnecting.
Multi-pack setups on one inverter are not supported: GoodWe treats each BMS as one bank. Use two inverters in parallel with two packs and two controllers.

Frequently asked questions

Does the GoodWe SEMS Portal show correct data for the Tesla pack?

Yes. SEMS Portal reads the CAN data the inverter received (SoC, V, cell min/max, T min/max) and displays it as if it were a BYD HVS. All fields populate correctly; the "battery model" shows as HVS regardless of the actual Tesla variant.

Can I set separate charge / discharge time windows?

Yes. PV Master → Advanced → Battery → Working Mode → Economic Mode lets you define time-of-use charge and discharge windows, or use "General Mode" for self-consumption. Both work with the Tesla pack because the inverter is the scheduler, not the battery.

What is the round-trip efficiency?

Measured 90% AC-to-AC on GW10K-ET at 5 kW, 88.5% at 10 kW. EH single-phase is slightly higher at low power because it is fanless: 91% at 3 kW.

Does peak-shaving work?

Yes. Peak-shaving mode on ET reads the grid CT clamp and modulates battery discharge to hold the site's grid draw below the set limit. The Tesla pack's 150 A + discharge capability is more than enough for any residential peak-shaving scenario.

Can I parallel two ET-10K inverters onto a common three-phase bus?

Yes. GoodWe supports parallel operation up to 5 ET units. Each inverter must have its own battery bank; add one Tesla pack + one BMS-EV controller per inverter, and enable parallel-master / parallel-slave via the RS485 parallel cable.

What is the maximum PV oversizing?

1.3× DC/AC ratio is the official GoodWe recommendation for all EH/ET models. In practice 1.5× works if the site rarely sees full irradiance simultaneously across all strings. The excess is clipped, not damaged.

Does GoodWe support EV charger integration?

GoodWe has its own HCA EV charger that pairs with the ET series over Wi-Fi. It behaves normally with a Tesla pack — the charger just sees a battery available for surplus PV. Other brand EV chargers work via Modbus/TCP with GoodWe's open API.

Backup output — can I run my heat pump on it?

ET-15K or larger with a soft-start compressor: usually yes, but verify the compressor's inrush current is below the inverter's backup surge rating (typically 2× continuous for 5 seconds). Most modern inverter-driven heat pumps qualify.

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Last updated: 2026-09-18

Current firmware: 15.0.14

Technical author: BMS-EV engineering team (Clima Boost sp. z o.o., Poland)

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

Revision: 2026-09-18 — aligned with firmware 15.0.14, SOFAR 180–800 V DC verification, Kia EV6 + SOFAR HYD 15KTL case study reference