Re: 12 V cooler

Depends on your battery size, amp rating. Reserve rating of battery should show 20 amp draw for so many minutes, say 100 minutes or so. At a 6 amp draw at this example you would get about four times the use use. Perhaps 400 minutes or about 6 hrs of use. You should be fine for about 4 hours of run time and still start your vehicle. Take a chance and live life on the edge.