Conversion kit
I've been using a Norcolder icebox conversion kit for several years now, no problems to report. At the time, this was the only unit I could find within my budget that would run on both 110V and 12V. It automatically switches over when you plug in the shore power. Maybe one problem: sooner or later you'll freeze a beer, split a can open, and make a mess. I was forced to switch to bottled beer.