Solarmon

A simple Python Script for reading Growatt PV Inverter Modbus RS485 RTU Protocol and publishing telemetry via MQTT

Protocol Documentation

How to use

• Some hardware running a Linux based OS with Python 3 (eg. Raspberry Pi)
• Connect your Linux based OS to the RS485 port on the inverter via a RS485 to USB cable
• Copy solarmon.cfg.example to solarmon.cfg and modify the config values to your setup as needed
• Run pip install -r requirements.txt
• Run python solarmon.py in a screen (or you could setup a service if that is your preference)

Reading from Multiple Units

To read from multiple units add a new section to the solarmon.cfg config with the unit's id.

[inverters.<name>]
unit = <id>

Example:

[inverters.unit2]
unit = 2

Use your MQTT broker and client (for example Home Assistant MQTT discovery) to view inverter telemetry.

Systemd Service

• Copy solarmon.service to /etc/systemd/system
• Modify the WorkingDirectory and User to suit your setup.
• Run systemctl start solarmon to start the service.
• Run systemctl status solarmon and ensure that the service is running correctly.
• Run systemctl enable solarmon to make the service automatically start when the system does.