OP
silva.foxx
Take a look at page 86, parameter P297... switching frequency. Decrease it. I have seen in IMO manuals that switching freq. contributes to RCD tripping.
I must be on another planet.
Of course taking the inverter out... nothing would happen... just like taking your chain off your motorbike! You wouldn't ride the bike (machine) without it, would you? But you may prove something is not wrong with your engine, clutch and gearbox.
You've stated that the inverter is the definite cause of the RCD tripping, yet have you proved it really?
You've replaced/removed the socket RCD. The machine is running. Why fit an RCD at all now then?
Why is a 30mA RCD fitted? Additional personal protection?
Will a 300mA give this protection? Is 50mA the fatal limit to keep below?