That's a cool fridge. I swear I didn't mean that as a pun, I swear. Fridge tip: keep it as full as possible, because chilling empty space (air) requires more energy than if there's an object there.
It's too bad other devices weren't propane powered. Or are they? A propane generator, if there's such a thing, could give you emergency power. The solar paneling is a good long term solution though.