Ed is right; the converter is powered by a 15 amp CB in the power center (Power distribution center). Younger USAF aircraft Maintance officers soon learn not to try to correct the old man's pronouncements The converter's 12 volt DC output is wired directly to the 12 volt bus (with all the 12 volt fuses). The entire 12 volt bus is connected to the house battery bank by only the stepping relay (use/store- switch or master power) and a 50 amp 12 volt CB. (The CB and power cable are larger in coaches with massive battery banks and larger converters.) The converter is much more than a computer controlled battery charger. The converter is able to power the entire coach's 12 volt power load while still continuing to recharge the batteries, admittedly at a reduced rate.
The output of the inverter is always 120 volts AC, but the input can be 120 volts AC from the power centers CB or 12 volts DC from the house battery bank and is controlled by the inverter's pass through relay.
Solar is wired to a charge controller in the battery compartment and that controller is wired directly to he house battery bank.
The engine's alternator us connected directly to the chassis battery and the chassis battery is usually connected directly to the house battery bank through some sort of charge controller (BIRD, BIM, etc)
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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