Many coaches do not charge the chassis battery from shore power. I added a trickle charger to my chassis (diesel starting) battery bank so it could be maintained from shore power since I was living in it full time over the winter and driving it only once every 3 months or so for a brief one day trip. Battery maintainers like the quality trickle chargers and the sophisticated electronics in an inverter/charger that serves the battery bank for the inverter are pretty good and not overcharging and needlessly driving off battery water...but the 12 volt converter/charger on most house battery banks will definitely tend to de-water the batteries. I used the manifold filling accessories on each of my battery banks to allow a squeeze bulb to easily add distilled water without overfilling and simply made a routine of doing so every couple of months to ensure the levels were always at or near full.
There were eight total heavy batteries in my Tour Master, so taking them all out over a winter would be a lot of work and the above methods gave me years of service on each quality battery.
Chuck
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2007 Tour Master T40C
Acura MDX toad
"It takes a great deal of time to recover from any improvement..."
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