I agree there are cloudy days. But the OP has an onboard generator and either has or will have a PV array. I don't see any ROI for incurring the added costs of adding yet an additional charging source to the two existing...which by the way can only be used when hooked to the TV and it's running.
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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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