Copyright (c) 2021 Pontus Nordin
A python 2.7 script to allow direct monitoring of sungrow inverters (tested with SG20KTL-M) over LAN TCP modbus connections and publish to MQTT (Home Assistant)
Based on a copy of thomasfa18's Sungrow Monitor script
MQTT stuff stolen from all over the internet
First try with python... not good looking and probably not efficient or totally failsafe
First try with MQTT... probably not doing it right... lots of problem with publishing state after X number of messages, return code = 4 Probably not handling network loop correct...
Has been running fine for some time now
- Install python 2.7
- Install the required python modules
- requirements.txt
- Modify config.py so that it matches your environment
- Run the script
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- This has been tested on a sungrow SG20KTL-M inverter only with the script running on a Raspberry PI 3b+ with Raspbian 9 Stretch
- A list of "valid devices" is included at the top of the modbus map, this came from the sungrow modbus specification document directly. It may work with other devices, I do not know.
- The script only performs reads of the input registers (function code 04), if you do not know anything about modbus I would highly dicourage you from making changes.
- In short, you are welcome to use this, but if you do you are agreeing that if something bad happens then it was not my fault and you can't sue me.