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It's combination of your alternator capacity and the wire you intend to use to feed the DC to DC charger. You can go to Victron's website and download and view the installation manual for the various offerings. There will be sections on wiring. Other manufacturer's may offer the same ability.
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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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