Auxiliary Battery Wiring for Portable Fridge

landyacht318 - thanks for your comments, but.... Just unplugging it at night without an auxiliary battery will shut down the fridge with no cooling. Not a satisfactory solution even though it should maintain its cool for quite a while. The factory cords are very expensive and proprietary so I hate to buy a second cord (yeah I can afford it but hate to be ripped off). 18 gauge is fine for 10 amps (over double the fridge draw). My concern was adequate voltage to charge the battery - don't see the voltage reaching the fridge as an issue. The Group 34 battery is good for over 50 amp-hours so the draw down in a 24 hour period is not that great although I'm not the type to go a day without driving some. Being in South Central Texas regardless of which way I'm headed, my first day is 400 to 600 miles so even if I don't put it on a charger before hand I would expect to be pretty much fully charged as the trip commences. I believe the Edgestar fridges are designed to shut down on low voltage to conserve the vehicle batteries for starting. Hence the reports.