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What's the make & model? That sounds extremely low for an entire night.I mainly use it while camping with a CPAP. Which draws about 1ah.
So your are saying that Andrew White (in the video ) is wrong
and there is another reason that my DC charging using a dual setup / battery isolated failed to maintain a proper charge during my 3,000+ mile trip this summer?
It depends on the model, but many CPAPs use about 3-5A, or about 30AH per night. There is a lot of variance though. There are many poor chargers that go to float WAY to soon. This can have a major impact on the life of a battery. So you may want to make sure the charger is doing its job, and holding the absorb voltage for at least a couple hours after a discharge that deep.
Dunno. Didn't watch the video. Don't need to since I know exactly how this stuff works. But if you were repeating what he said, then yea, he's wrong.
Dunno. You said you used an isolation transformer. Since that can't possibly be correct, you must have something else. But since you have not accurately described whatever it is that you actually have, there's no point in trying to troubleshoot it.
using the vehicle's alternator and an isolation transformer
oops. my mistake. thanks for catch that. I meant battery isolator.Just saying.
But let me throw a guess at it.
Perhaps what you actually have is a diode-type isolator. These are sold at any auto parts store. They have a big heatsink for the diode. They are notorious for having about a half a volt drop through the diode.
Perhaps you also have a Toyota vehicle. Notorious for maintaining the electrical system at about 13.9v.
Combine those two problems and perhaps your batteries are only presented with 13.4v as a charge voltage. That might be enough to top off the 0.2 amp hours used from the cranking battery to start the engine, but is nowhere near the 8 hours at 14.5v needed to fully charge a house battery.
I believe it was voltage. Time shouldn't have been a problem Driving from St. Louis, to Big Bend National park in south Texas, to New Mexico, and to the east coast. and back.That's not a diode-type, which is good. That's a solenoid-type, a.k.a. "split-charge relay".
So with that, failure to fully charge the battery is narrowed down to, A) inadequate voltage, or, B) inadequate time for the battery to fully absorb.