Yeah we have dual deep cycle batteries for the MH. A couple times i drained the batteries on cold evenings when the furnace would go on and off during cold nights on top of light usage at times and powering the water pump etc. I bought the big 100watt solar panel early last year and those suckers have never gone down past about 75% no matter how much usage was going on during the day. Best investment that i have made for the unit, bar none.
More importantly we have a built in generator that also needs the batteries to fire up, which in turn can run everything in the unit using very minimal fuel doing so. Problem was when the batteries died, I didnt have the cranking amps to fire the gen. so it was a crappy catch 22. I would have to boost them with a power pack or unhook the main MH battery and boost.
Long story short, get a solar panel and never worry about battery life.
As for the propane thing, we fill a 50LB tank at the beginning of the summer and never ever run out before seasons end, and we dont go to paid camping/plug in sites. All off-grid stuff.
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