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In the 2 years we have owned Vegas, I have only filled house batteries once.
A good portion of the time it is plugged in to shore power. I keep a tattle tail voltage indicator in power port off chassis battery. It ranges 12.4 to 12.8. I have looked in AM and saw 12.4, then in afternoon it will be 12.8. Not every day but serves as quick check. I have never needed to add water to this battery.
The house batteries stay at full on indicator unless we are parked at racetrack in cool weather overnight. During high heat demand, 40 degrees or less and showers/lighting/furnace/fridge I have seen 2 lights in morning. I would fire either internal or race trailer generator and it would recharge house batteries while I make coffee. I will also sneak out and watch a DVD/Bluray through 700 watt inverter to cycle house batteries some, if I take it down to 3 lights, 2 movies, it recovers pretty quick.
I did have to replace power supply board for converter once, both give same voltages and charging characteristics.
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