GoodWe GW100K-ET-G10

Compatibility

Compatible through Modbus RTU

GoodWe documents the EMS RS-485 connection and publishes a read-only monitoring table within its third-party EMS protocol. This is a documented integration path, not a physical qualification or downloadable Edge template.

GW100K-ET-G10 in the July 2026 EMEA datasheet, ET 50–100kW user manual V1.2 of 2 July 2026, and Third-Party EMS Protocol MODBUS V1.1.1 linked by GoodWe for this family. No minimum firmware version is specified in the retained protocol. Confirm installed firmware and map availability during commissioning; older ET, ET G2, BT and other regional variants are separate scopes.

Connect it with

• 
  Modbus Interface ZMB-3X
  From €399 ex VAT Configure Modbus Interface
• 
  Gateway ZGW-20
  From €899 ex VAT Configure Gateway

Models

Specifications

GW100K-ET-G10 is the 100 kW selection in the EMEA ET 80–100kW hybrid range. It has eight MPPTs with two PV strings per MPPT and two high-voltage battery inputs. The July 2026 regional datasheet specifies 300–800 V battery operation and 110 A maximum continuous charge or discharge current per battery input. These are inverter limits, not permission to use an arbitrary battery: the battery system and BMS must also be compatible. Backup operation needs the separately specified STS box or cabinet.^1, 3

Regional scope

GW100K-ET-G10, EMEA July 2026 datasheet³

Nominal AC power

100 kW, three-phase 220/380, 230/400 or 240/415 V³

PV inputs

Eight MPPTs, two strings per MPPT; 1000 V maximum input³

PV voltage boundary

160–950 V MPPT operating range; 950–1000 V enters standby under datasheet footnote 1³

Battery inputs

Two; 300–800 V operating range; 110 A maximum continuous current per input³

Local EMS connection

Port E: pin 1 RS485-A1, pin 2 RS485-B1¹

Serial defaults

9600 baud, 8 data bits, no parity, 1 stop bit; address 247 before configuration²

Protection and environment

IP66; -35 to +60 °C; stated maximum operating altitude 4000 m³

Backup topology

Requires the specified separate STS box or cabinet³

Interface

Documented measurements and integration boundaries for GW100K-ET-G10.

• PV input voltage and current with the scaling stated for each register.
• Individual MPPT power, distinguished from total inverter and grid power.
• Battery and system operating status where supported by the installed firmware.
• Device serial number and external model name for identity checks.

Setup

1. Identify model, region and firmware

   GW100K-ET-G10 in the July 2026 EMEA datasheet, ET 50–100kW user manual V1.2 of 2 July 2026, and Third-Party EMS Protocol MODBUS V1.1.1 linked by GoodWe for this family. No minimum firmware version is specified in the retained protocol. Confirm installed firmware and map availability during commissioning; older ET, ET G2, BT and other regional variants are separate scopes.

2. Use the EMS port

   Follow the installation manual for the dedicated EMS port E, pin 1 RS485-A1 and pin 2 RS485-B1. Verify bus ownership before adding a client. Do not attach the polling client to the battery CAN, meter or transfer-switch communication connections.

3. Match the configured serial settings

   The protocol specifies 9600 baud with 8 data bits, no parity and one stop bit. Addresses are 1–247, with 247 as the factory default. Read the installed setting instead of assuming a default address is still valid.

4. Begin with identity and one monitoring read

   FC03 at literal address 35103, quantity 4: PDU 03 89 1F 00 04. This reads PV1 voltage (U16 ÷10 V), PV1 current at 35104 (U16 ÷10 A), and MPPT1 power at 35105–35106 (U32 in W). Synthetic words 1838 0064 0000 1838 give 620.0 V, 10.0 A and 6200 W. Combine the two power words most significant first; do not divide the watt value by 10 or treat it as Float32.

5. Check scaling and freshness

   FC03 address 35137, quantity 2: PDU 03 89 41 00 02 reads Total Inverter Power, signed S32, scale 1 W. Synthetic 00 00 30 39 gives 12345 W; FF FF CF C7 gives -12345 W. Join both words before signed decoding. The map lists a one-second read cycle; retain sign and compare a fresh value with the local interface.

6. Keep the first integration read-only

   Use only the monitoring table. Do not copy the protocol’s third-party control sequences, heartbeat settings, charge/discharge commands or RTC writes into a monitoring client. The protocol includes inconsistent CRC wording beside CRC frame fields; use standard Modbus RTU CRC16 through the client, never disable frame integrity checking.

Common questions

Is this a guide for the older 10 kW ET?

No. GW100K-ET-G10 belongs to the current commercial platform. Legacy ET and ET G2 ratings and protocol maps must be matched separately.^1, 3

Does WiFi or SEMS+ access provide this local Modbus connection?

No. Vendor remote monitoring and the dedicated EMS RS-485 connection are different paths. The datasheet also lists Modbus TCP, but this guide does not infer TCP settings from a cloud connection.^1, 3

Can I add this client beside an existing EMS?

Not as a competing master on the same serial bus. Coordinate with the existing EMS owner or obtain measurements through its supported interface. Meter, battery and transfer-switch communication are separate connections with their own roles.¹

Why does the guide avoid control registers?

The published document contains operating-mode and battery dispatch commands as well as measurements. Reading voltage does not validate their safety or the interaction with site controls. This guide stays within the read-only monitoring table.²

Is there a documented minimum firmware version?

The retained V1.1.1 simplified protocol does not state a minimum inverter firmware. Record the installed firmware and verify the intended monitoring entries during commissioning rather than inventing a universal firmware floor.²