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When you are running the RV the alternator is charging both the cranking battery and house battery(s). Since the batteries are in parallel the alternator senses this combination. There is a slight difference between the house and cranking batteries because of wiring but the alternator provides for most part the equivalent of the lowest battery. For automotive charging systems 14.1 or 14.2 volts is perfectly normal the whole time the engine is running. The other part of the equation that is being overlooked is the amount of current the alternator is generating. This starts out high and tapers off over time.
You typically don't see the voltage this high from the convertor because they are not true chargers. For in depth information check out batteryfaq.org and battery university.
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2016 Axis 24.1 E-450 6 spd tranny
300 watts portable solar.
200 watts solar on the roof.
Wrangler JK dinghy
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