How did you get on?
My ac50s which looks very similar won't charge, so im looking at some similar salvage operation, although probably just mains charging for me.
My Bluetti / power oak ac50s (just under 2yrs old) seems to have stopped charging whatsoever, from car, solar or mains brick. Been searching high and low on net and YouTube etc, can't find a fix, anyone had any ideas?
Ive opened it up to double check anything obvious, the battery fuses are ok...