Re: Xantrex 458

I’m sorry to hear about your situation. As you’re really unprepared to deal with RV maintenance and repairs. I hope your situation is voluntary. 
That said, it is about impossible to diagnose your issue as you described a whole bunch of things basically as one not too descriptive run on sentence. 
Best bet is first verify whatever source you’re using to charge the batteries is working. Next test if the batteries are actually good. 
from there, idk. You could have a multitude of pre existing issues or one issue like bad batteries causing the whole mess. 
please try to isolate what happens and when and in what order.