No it’s always worked completely fine, just the display reporting bad information.
The guy at RoadPro lives local and has said he’ll come around anytime I need him, can’t fault them.
The socket is due to it being on the fridge circuit which the
inverter doesn’t power, once on EHU it’s fine.
Run the kettle several times this afternoon and put all the lights on etc at the same time, didn’t miss a beat and the display hasn’t been an issue