anybody had any first hand experience with this???? Air only cannot be reversed. It would be enough to just cool the cabin a little and not have to run a generator.

http://www.kooleraire.com/

I don't have the name, but Concept puts a unit in that runs off of ice and seems to work well.

I've been following the DC versions for a while. They do seem to be improving but IMO not there yet. The best I could tell is if you have "house" batteries just for the AC unit, set the t.stat to the most efficient setting, went to bed @ midnight and got up @ 6:00 AM you'd get up to two dead batteries. T.stats on timers might solve this but don't think I saw them yet??
I love the idea. Set to cool early then back off through night and back to cool at early AM.