bob_nestor wrote:
... at most the unit can probably create about a 40 degree F temp difference, ...
I think that number is a bit optimistic, but the bottom line is you won't be getting "ice cold" beer out of one on a 90F day !
12VDC compressor refrigerators DO EXIST !
However, a good, Energy Star, high efficiency
residential refrigerator, an inverter, some decent house batteries
(minimum TWO 6V golf cart batteries, 4 is better) so solar panels
(or a couple of hours with a generator and battery charger) and you will be a much happier camper.