1. intro

important modbus references:

  • 30845 soc

  • 30851 battery voltage

  • 40150 charge

  • 40151 activate mode

2. install modpoll

https://www.modbusdriver.com/modpoll.html

3. get battery voltage

modpoll -0 -a 3 -r 30851 -c 2 -1 192.168.0.41
///
[30852]: 0
[30853]: 20929

4. get the soc

modpoll -0 -a 3 -r 30845 -c 2 -1 192.168.0.41
///
[30846]: 0
[30847]: 10

5. set the soc

modpoll -0 -a 3 -r 30845 192.168.0.41 0 12
Written 2 references.

6. turn on the write modus

modpoll -0 -a 3 -r 40151 192.168.0.41 0 802

7. charge

10A

modpoll -0 -a 3 -r 40150 192.168.0.41 65535 63535

20A

modpoll -0 -a 3 -r 40150 192.168.0.41 65535 61535

30A

modpoll -0 -a 3 -r 40150 192.168.0.41 65535 57535

8. turn off the write modus

modpoll -0 -a 3 -r 40151 192.168.0.41 0 803

9. references

https://community.home-assistant.io/t/modbus-write-register-settings-sma-battery-invertor-using-service-modbus-write-register/325668