When I store our motorhome, it is plugged into shore power. Should the 12V disconnect switch be on or off. I don't have any need for any power while in storage and see no reason for the switch to be set to the on position. My thinking is that the batteries are still getting charged but with the switch off there is no draw on the batteries. Is this correct?
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Not sure of the rig that you have but on mine I keep it plugged in when not in use & switch in the on position. I use a Iota 45amp 3 stage converter & all 3 batterys cruise @ 13.62 volts w/a battery separator installed this has worked very well for the last 18 months have not added any water to the batterys you might want to check your batterys with the switch on then in the off postion to see if it makes a difference on your volt meter.From what I have read on this forum the electronics are very voltage sensitive.
I keep my coach plugged in and the master 12v switch "on." This has worked well, the draw on the batteries is very little...propane leak detector, main power to TVs, and a couple of smoke detectors. Also, I do not have a converter, I have an inverter/charger.
2014 American Eagle 45T
Pulling a Honda CRV
You can leave the switch on - there is no benefit in turning it off when on shore power. And in some rigs, the battery won't charge if the disconnect switch is off (the disconnect is between the charger and the battery). It all depends on how the factory designed the wiring.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL