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Very good analogy John, I might also add that your rig is NOT designed to run without 12 volt. Your rig needs 12 volt power to power the circuit boards on your fridge, your furnace, water heater, and again fridge need 12 volts to power the igniters for the gas burners, and the propane and CO detectors need it for their power. As John said the slide pump and landing gear motors are also 12 volt units. The fan on the converter kicks on when the converter is working hard to "catchup" with the current draw from the battery. While talking to the tech from IOTA the other day he stated that a converter should be rated at about 10% of your rated battery current. 75 amps for a battery rated up to 750 amps and so on. I asked about two golf cart batteries and he said a 75 amp unit would handle 4 6volt golf cart batteries easily... Dave
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