Hello
Old revival here, sorry for that but I'm in a similar situation.
Context: Axpert 5kva 48v, battery pylontech us2000c, In EU (240v here, not 120v) with 3000w solar array
I have the exact same issue as your but only in SBU mode (when using battery even if grid could be used, I do it to optimize off-peak usage)
I would like to see a full schematic with all grounding wires (The one from Grid, solar panels, battery, all of them) So I make sure my own wiring is correct. Is that possible?
Thanks 😃