DRKNAPP - Well your water heater is 110V and your furnace is running off the 12V battery. So it's a combination of the load from the water heater and the converter that charges your batteries. What was your power source that the RV was plugged into - 50 Amp, 30 Amp or 15 Amp?
In my case the furnace and the lights were all 12V and I was plugged into 15 Amp. So it was just the load that the converter was drawing.
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