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Solarmon

A simple Python Script for reading Growatt PV Inverter Modbus RS485 RTU Protocol and storing into InfluxDB

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
  • Install InfluxDB
  • 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)
  • Install Grafana
  • Go to http://localhost:3000/dashboard/import or equivalent for where you installed Grafana and import grafana/dashboard.json

Inverter Grafana Dashboard

Reading from Multiple Units

To read from multiple units add a new section to the solarmon.cfg config with the unit's id and the measurement name to store the units data in influxdb

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

Example:

[inverters.unit2]
unit = 2
measurement = inverter2

To view the data using a Grafana dashboard simply import the template like described above in "How to use" and then change the measurement variable at the top of the page to match what you put in the config, in the example that is 'inverter2'.

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.