I have a small 12-volt cooler, it takes 4 ½ amps to run it, that is a serious amount of power for a solar panel to produce. That comes to about 55-watts, you need a panel that is more then this to make up for clouds and shade. It would take about $800.00 to get a good 75-watt panel. A 75-watt panel is also somewhat large, about 2 foot wide by 6 to8-foot long.



Solar power is great, but it’s still very expensive when you want any real power out of it.



PS a 12-volt cooler plugged into a car cigarette lighter socket without the car running will kill the battery enough that the car will not start in just a few hours of the cooler running.