The ice box on my boat was inadequately insulated and did not keep a bag of ice frozen for more than a day. This long article shows how an ice box can be converted into a 12 volt powered freezer. Few tools are needed to install the equipment from a plug-and-play kit. The article also describes how insulation can be increased to reduce running times and battery consumption.
2308 words 10 pictures. Price for this article $10
CONVERT AN ICE BOX INTO A FREEZER.