I have the coleman 12 volt/elec. chest
fridge. I use it at home when the power goes out. I use it in the
fall when I go camping for a week. I stay mostly at an electic site and then plug the chest into 110 outlet, Putting it on a table outside the camper and turning it verticl like a
fridge. It really does give you more fridge space. You do need to watch it as the condenser sometimes freezes up, so you let it rest to thaw. Have never used it in the 12 volt, I think it would draw too much current for my use. Only have one
battery. You also have to put ice bottles in it or cold things when you first turn it on because it takes a long time to get cool, then it is great.
You got a great buy at the auction, congrates!
I paid around $79.00 for mine at Walmart about 10 years ago.