Cool cooler hack, I needed a cooler while in Europe to keep insulin cool (Ice is hard to find).  I looked at power supplies designed to run 12v coolers and they all work on 110v 60hz (and produce 12v 5Amp).  I found an old computer power supply the produces 15v 6Amp and works 110v or 220v 50/60hz.  Put a cigarette lighter plug on it and the coolers runs great.