Hey rambler,
The A/C is a 13,700 btu basement model (116lbs). I wanted to use the cheaper lighter unit that goes on the roof, but the 3 solar panels take up most of the roof, so I had to go for the under vehicle unit.
The battery pack was the weight killer, at 600lbs, it sure was heavier than the apu's, but worth it in the long run. My water supply is 50 gals, so if I'm too heavy, I just water the lawn wherever I am, and then refill at the receiver, I haven't met one yet who won't let me hook up the garden hose.
I chose this system because it has the indefinite capacity, pretty much wherever I go, the sun charges the batteries (in conjuntion with the 65amp alternator), and when I park, I just flip a few switches, and I have all the power I need.
If the battery pack is running low, I get out the little genny, (only had to do it a few times, the rest of the time I just use it to keep it operational)
I would like to get a genny that turns itself on at a certain point, but I have not found one small enough, as you can imagine, both sides of my truck are pretty well filled up with batteries, and water tanks.
Drive safe
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