very interesting
I had excluded the idea of a real fridge based on the prices and planned to run my little Peltier unit. Then I found that fridge on Craigslist for $80. It was an hour drive, but I went the same day. It's really an awesome unit.
Everyone knows that the inverter is less efficient than direct 12V operation, but the real problem is that the inverter will draw some power all of the time, even when the fridge isn't running. With dual battery and running the rig every day you could probably make it. You can probably get it set up for $150, which is practically still in the peltier (toy cooler) price range. Plus you get that tiny freezer.
Hmmm apparently there are some reasonable priced 12v fridges. I just saw one on walgreens website for $130.
And now Im also looking into making a fridge myself...
Do you mean the Koolatrons? They are thermoelectric coolers, not real refrigerators. They do cool stuff, but very slowly and the interior temp varies with the external temp. They also consume a lot more power than the swing compressor fridges (2-3x?). I assume this is the style you are talking about building, which should be feasible. I think you can buy a thermoelectric cooler for a lot less than $130.
After cleaning that out, it feels the way 4.88s should. Too bad I didn't find it until camp the last night.