Thx Bo,
I am very much a newbie with this, I didn’t realise that HA already supported Modbus, nor understand the need to add the code to configuration.yaml. I am very much a graphical user!
I am now using Modbus Client app (on my Mac) to test if I can retrieve any data. I suspect that I may have issues due to the encryption that has been reported being used by Sungrow.
But you have certainly answered the immediate question 
I am sure I will have more