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Old 04-05-2015, 11:53 AM   #41
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A charging battery willusually show lower voltagethan a fully charged one. After some charging during which the voltage will gradually rise it should show about 14.5 V when on charge.
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Old 04-06-2015, 07:27 AM   #42
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Originally Posted by BlueYonder View Post
Electronics and such have low current demands but run for extended periods of time. The house bank is where they should be.

Yep, that's a good point, too.

Design issues aside, I only meant to suggest that "problems" are sometimes actually lightly disguised "opportunities."



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Old 04-06-2015, 10:08 AM   #43
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Or.....his batteries are just fine and he has a charging system where, once the batteries get below a certain state of discharge, the Balmar engine charging system can't get them charged back up again because it's calling for more than 30A of charge current and shutting down.

Load testing the batteries is good, and you might well find a bad cell or two.

And beefing up your battery system is probably a good idea too.

But if your charging system works the way it's been described, I think you will just end up right back where you are now. So I'd check real carefully to be sure the Balmar engine charging system isn't shutting down when your batteries are heavily discharged.
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Old 04-06-2015, 10:45 AM   #44
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So maybe the batteries are charging, but just old and weak?
That's my bet
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Old 04-06-2015, 10:58 AM   #45
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So maybe the batteries are charging, but just old and weak?
Or maybe the batteries are fine and not charging once drawn down below a certain level.

This is what you need to figure out. You can guess, then replace parts and see what happens. Or you can do some test and experiments to really diagnose the problem.

Isolating each battery, checking its voltage, and load testing is a great step to assess the batteries themselves.

But even if you find one or more bad batteries, I'd carefully check the engine charging system, especially with respect to the Duo Charge (I think that's what it's called) and what happens if it starts shutting down when more than 30A is called for. If that happens, how will your batteries ever get recharged? If nothing else you need to know how to detect if this is happening, and have a way to recover from it.
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