Hi Pete and welcome!
There are a lot of threads here discussing the inverters and battery chargers. Just do a search in the forums.
As I recall, the built-in chargers won't charge up a dead battery, but will take one that's down to no more than 10.5 volts, back up to full charge overnight. That's a little longer than a couple of hours.
I'm heading your way in about a month. Please see my http://www.airforums.com/forums/f42/...rip-34762.html
thread. If you can provide any suggestions, I would live to have them.