@Hedges
Ok was not aware that running from battery essentially isolated me from neutral.
>Which may be required in your location, because with ground bond at an unknown distant location, Neutral can become hot.
I will find out in more detail about how neutral is bonded here in Japan. Really appreciate you bringing that to my attention.
>Maybe you also should have RCD between inverter and loads?
> Find out what is proper in your area.
Yep I'll research that and also discuss with
@Daddy Tanuki.
Massive thanks to you, you've added a lot more clarity to this!!
Going back to your previous point, you said:
"If it was me I would bond all chassis together and to ground rod and/or pipes. But then I'm familiar (too familiar) with shock hazards in the US."
I'll consult with a local electrician but is there any harm in just following this advice anyway?