Sungrow-Modbus

TCP Client for Sungrow Devices with AES128 ECB encryption

Class based on pymodbus.ModbusTcpClient, completely interchangeable, just replace ModbusTcpClient() with SungrowModbusTcpClient()

Home Assistant Custom Component

• Tested with HASS docker v2025.8.3 and Sungrow SG4K inverter

• ALL the component code was ripped from the modbus custom component dev repository https://github.com/pymodbus-dev/homeassistant_modbus. Unused code was removed.

• Copy the folder sungrowmodbus into your custom_components folder and add the integration to configuration.yaml. Example config provided for SG4K inverter in sungrow_sg4k.yaml

• For standalone use (outside home assistant): copy the sungrow.py file into your project and import the class AsyncSungrowModbusTcpClient. It is a decorator on top of the async modbus TCP client (AsyncModbusTcpClient) that handles encryption transparently.