"ONE MORE TIME" is not necessary 16ACE27, this is your first entry to this thread. Thanks for the photo but mine is absolutely nothing like that.
For any others, I know of no "Power Center" in my coach. At the foot of the bed there are two separate panels 1 has 12v fuses the other has 110 v circuit breakers. there is no access adjacent to them.
A different thread said the invertor may be the "Converter" looking at the Xantrex 1800 specs it does not have any DC out so it could not charge the batteries. Thank you