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If you plan to do lots of boondocking, then the first thing I would do is install a shunt based battery monitor. Here are four choices in increasing levels of sophistication: Qworks, a $50 unit from Amazon that is basic but works well. Renogy, a mid level one. And Vicron with Bluetooth connectivity.
Then measure your daily amp hour usage. It will probably be about 100 amp hours if you have a DC compressor fridge, as much as 150 Ah if a large residential AC fridge run off of an inverter, and less than 50 Ah if it is an absorption fridge and you do little TV watching.
Then determine whether you will camp in shady, tree covered areas or open areas that can produce significant solar power.
And finally how long do you spend in one campsite before you pack up and go home or drive to another campsite?
With that data in hand, you can make a reasonable determination of battery and solar capacity.
FWIW with our newish Thor Axis we use about 30 Ah daily (absorption fridge) and can go at least three days on 200 Ahs of AGM batteries before going below 50% SOC.
David
With those two
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