Wired it as my other XYS-AT1 unit and the same as Routercnc did in his video. Got the 2 page manual, looked at it after I had wired it, no load just the three mains wires. The manual says different than the board?! Routercnc mentions in his video a similar issue with another inverter. UK seller has agreed to take it back for refund, annoying as it was £30, guess I know why :)

https://www.youtube.com/watch?v=NiXFlVzR29Y