Van Charging house battery
I am trying to figure out if all is ok with the van charging the house battery.
With nothing on in the house or van, the house battery sits at 12.6/7 or so. Just fine. When I am idling the van, it still stays at about the same voltage, like its not getting charged. While driving the voltage reads 13.5+. I am trying to figure out if that is ok or normal. Worrying over nothing? I am a very electrical novice.