If all you want to do is power the fridge for boondocking then you can getaway with a relatively small inverter and adequate batteries with an appropriately sized solar array or modest generator. If you want to power more items for convenience you should really determine what your loads needs will be so you can have a target to design around.
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SOB
2015 Volvo VNL780 D13, iShift, 32k ET air hitch, Idle Free LiFePO4 APU
16.8KWhr LiFePO4, 2.52 kw solar, 10kva Victron split phase
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