A little off-topic but new here and not sure if I can post yet, (or how to) I have a 2007 itasca cambria and see that the "brochure" says it has a 45 W converter, but is this a single stage or multi stage? Wondering about putting AGM or Lithium in and didn't know if I would have to change converters. I guess I should dig around behind panels to find it and check model # etc.