This is probably a dumb idea but I am wondering if anyone has used the mobicool soft cooler or something similar. These are the soft coolers that plug into a cig. lighter on your car. They are really cheap so my thought was to take the cooling unit and install it in my ice box on the boat to make a cheap 12V fridge. At around $50 it seems like a good idea. Don't know how many amps they pull though.