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

   Read the serial number at 35003 as eight registers and the external model name at 35060 as sixteen registers. Then use FC03 at literal decimal address 35103, quantity 1, for PV1 voltage. Do not subtract one from the documented address.

5. Check scaling and freshness

   Decode the selected value as unsigned 16-bit, most significant byte first, and divide by the stated scale factor of 10 to obtain volts. The table lists a one-second read cycle for this point. Compare with a simultaneous local reading and keep stale or unavailable responses separate from zero.

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