Auto detection did not work on my system.
…but now it seems to work with SunSpec. The measurements that are shown look valid.
How it is done:
- 
Create “Modbus TCP Slave” wit IP and ID = 126 
 look here : Modbus binding with Sunny Boy SMA inverter - #124 by Tuny : Modbus binding with Sunny Boy SMA inverter - #124 by Tuny
- 
Create “Three Phase Inverter” Start Adress is = 40185 
 @mrbig thank you for pointing this out.
These are normal modbus registers from sma. No SunSpec.