Growatt inverter the worst product

The most useless inverter I have come across, I Haber had it 7 months and just broke for the 4th time, they just say bring it in, I am not the instaler. Read in they replaced a 5kva main board with a 3.5, went on again, got new main board, went well and just blew the main board again. It is a poor product and I have proof of the above. I will take this further.