Checking 12V from outside the rig
My RV is parked on a gravel pad next to our house and is plugged into a 30 amp socket to allow the television to be powered on all winter and keep the converter charging the battery. I can see it from...
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How far? It would be cheesy but I'd just extend the leads on a cheap voltmeter into the house. there would probably be voltage drop but you could gauge that to just make sure the battery was staying up. Bt the time you noticed a light not being on, your battery would be dead.
