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Thank you, I will look up those Fridges. I know the Ice-less or Coleman cooler will drain the battery overnight. For camping purposes I would pack a 100w or more solar panel to assist with recharging the battery during the day.
I have tried to use a cooler like this when it is around 100°F. It does not work so well at that temp. I believe it cools to about 40°F below the current ambient temperature. So, if it is 100°F it will cool to about 60°F. Cool enough for beverages, but not perishables.