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Old 10-26-2014, 01:39 PM   #29
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If your batteries will only charge to 12.5 they are going south. May be time to replace. They need to charge up to 13.8 -14 volts.
They show 12.8 after being disconnected for a few hours and we're installed 3 months ago. My old one topped at 12.6.
When plugged in they go 14.6 for a short while, then drop to 13.6 for a few hours before going to float mode of 13.2.
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Old 10-26-2014, 03:26 PM   #30
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I would take them back.
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Old 10-26-2014, 04:06 PM   #31
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Dry Camping in Cold Weather

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I would take them back.

Why?



"When plugged in they go 14.6 for a short while, then drop to 13.6 for a few hours before going to float mode of 13.2"

The OP is observing exactly what happens with a 3 stage charger.
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Old 10-26-2014, 04:20 PM   #32
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Chief, 12.6 volts is a fully charged battery when not being charged. The batteries aren't a problem. My problem was simply not understanding what I was looking at, plus blocking furnace air flow.
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Old 10-26-2014, 06:17 PM   #33
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I guess I missed something. I thought the complaint was they were dropping off below 12v unless on charge. I can run my furnace on my 6 volt series set-up for 2-3 nights depending on how cold is gets. It seems if he is only getting a few hours out of 3 month old batteries that there is a problem. Batteries or charging system.
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Old 10-26-2014, 06:25 PM   #34
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If your batteries will only charge to 12.5 they are going south. May be time to replace. They need to charge up to 13.8 -14 volts.
That's been my experience as well. Not to mention they're going to start using a lot of water. The charging systems are calibrated to taper off/shut down at something over 13v. If your batteries can't/won't get to that, they're going to be charging constantly - thus using water.
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Old 10-26-2014, 07:12 PM   #35
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With your batteries in front and the charger in the rear I would be concerned about what is actually making it to the batteries. On a good note; the Alternator is close and should do a great job while driving.
If you want to remove all doubt about your batteries and the charging current making it to the batteries you'll need some type of meter and shunt installed. Once you have one you won't own a coach without one again. The Trimetric 2025 is what many of us have. It's very useful being able to see that the batteries are at 98%, the furnace is drawing 7amps, etc.
It wouldn't surprise me that the size cable from the charger to the battery bank is undersized.
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Old 10-27-2014, 05:55 AM   #36
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With your batteries in front and the charger in the rear I would be concerned about what is actually making it to the batteries. On a good note; the Alternator is close and should do a great job while driving.
If you want to remove all doubt about your batteries and the charging current making it to the batteries you'll need some type of meter and shunt installed. Once you have one you won't own a coach without one again. The Trimetric 2025 is what many of us have. It's very useful being able to see that the batteries are at 98%, the furnace is drawing 7amps, etc.
It wouldn't surprise me that the size cable from the charger to the battery bank is undersized.
The 2030 is on my wish list, but it is tough to convince DW of the need. I also wouldn't be surprised the cable is undersized, but I am not crazy about dropping the coroplast (sp?) to run larger cable. With full heat and air flow from the furnace now, and my bank topping off at 12.8, I think I am good.
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Old 10-27-2014, 07:22 AM   #37
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The 2030 is on my wish list, but it is tough to convince DW of the need. I also wouldn't be surprised the cable is undersized, but I am not crazy about dropping the coroplast (sp?) to run larger cable. With full heat and air flow from the furnace now, and my bank topping off at 12.8, I think I am good.
It's funny my DW could have cared less about the 2025 we installed but now she loves knowing what all the lights, furnace, alternator, solar, ETC are doing. ( Does that help! )

I reread you earlier post and I agree that it looks like your bulk voltage is in the right range.
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Old 10-27-2014, 07:59 AM   #38
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I guess I missed something. I thought the complaint was they were dropping off below 12v unless on charge. I can run my furnace on my 6 volt series set-up for 2-3 nights depending on how cold is gets. It seems if he is only getting a few hours out of 3 month old batteries that there is a problem. Batteries or charging system.
They did drop below 12.0 WHILE the furnace was running. Since I hadn't looked at it prior to this, I panicked and thought I had a problem. It was a momentary reading and really wasn't a problem, but blocking the intake with a recliner chair in stowed position was a problem. Lesson learned.
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Old 10-27-2014, 08:39 AM   #39
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Glad you have it all working. Good luck.
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