Since you only want to charge your batteries while parked at home, maybe just hook a battery tender trickle charger to them.
That would be an easy fix unless you wanted it plugged up to a 30 amp 110VAC to run items in the RV like the A/C or convection/microwave oven.
Before I had the RV outlet installed, I bought two battery tenders, ran leads from the coach battery bank to under the hood, and another off of the engine's battery.
With an extension cord, a multiplier plug, and two battery tenders, I can tuck them all under the hood out of the weather.
I still do this over winter because I do not want rodents nesting in the cord compartment with the window for the cord open.
Just a thought.
edit:
Oh yes, and while in storage this way, I switch the stow switch to the off position.
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Rusty
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