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Yes two 6 volts are better than two 12 volts, but one Lithium is the best. If you are going to get a Residential fridge, you need a lot more if you are going to day camp at all. Residential fridge will use around 300 to 340 AH in 24 hours. So if you have a long travel day, you could easily have two 6 volts or two 12 volts batteries very close to the 50% discharge by the time you arrive at you campsite with power.
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