I have 3 Multiplus 2 inverters with 3 phase connection. The problem is that the AC output voltage of one of the inverters has reached a value of 300V and reached 190V on another one ( the output voltage is set to be 230V)
This problem caused great damaged to the clients electrical equipment.
The problem only occurs when Grid power is ON. I tried disconnecting the grid and everything went back to normal.
I tested the AC input voltage and it has a value of 230V so the input power could not be the problem cause.
Tgere is nothing wrong with the inverter connections.
What might be the problem?