You could for sure. The biggest drain is the fridge. I found if we're winter camping (less solar) or in the deep woods with little sun, and don't want to run the generator a lot during the day, we turn off the fridge when we go to bed, and then turn it on when we wake up. The fridge has great insulation- I can turn it off all night and the ice cubes and ice cream are still frozen in the morning. We originally (before the extra batteries) bought several of the plastic ice thingees you put in lunch boxes, and would stick them in the fridge at night, but we found it was unnecessary.
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