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Old 06-13-2021, 11:48 AM   #1
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House battery overcharging?

I replaced the two house batteries yesterday. Both were significantly bulging. The tech at Interstate batteries tested them and said that one was bad and the other wasn't very good. So I replaced them both. I asked what could have caused the problem and he suggested overheating from overcharging for too long. How do I avoid a repeat of this problem. It's a 2009 Sportsmobile.

Thanks, Larry
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Old 06-13-2021, 11:52 AM   #2
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What type of batteries do you have?
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Old 06-13-2021, 12:00 PM   #3
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How do I avoid a repeat of this problem. It's a 2009 Sportsmobile.

Thanks, Larry
Monitoring your battery voltage would be a start.
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Old 06-13-2021, 05:56 PM   #4
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Look into your charging system. What make and model is your converter/charger?
Tell us a lot more about your vehicle.
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Old 06-15-2021, 05:12 PM   #5
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The new batteries are sealed lead acid. Interstate Battery Center calls them "Deep Cycle Mobility". There is a Xantrex LinkPro battery monitor. The inverter is a Tripp-Lite Model MRV2012VL. The Sportsmobile is built on a 2009 Freightliner.
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Old 06-15-2021, 06:35 PM   #6
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What's the battery monitor telling you?
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Old 06-15-2021, 06:54 PM   #7
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I guess the better question was what kind were the old batteries. I would suspect that since one was bad and one not so good, that maybe you dropped a cell in the bad battery, that would cause overcharging that would then take out the second one.

I did have a bulging house battery once after I found the cable shorted.


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Old 06-15-2021, 07:25 PM   #8
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The battery monitor seems to indicate that everything is working well now. At this time of the year, the primary draw is for the refrigerator. The manual tells me that the fridge will draw about 2.5 amp hours. So a fully charged battery should power the fridge for several days. We use a little bit of light when preparing for bed, but that's minimal. We might use the ceiling fans a bit this weekend since we will be camping at low elevation and it will be hot. Usually we are camping in the mountains in Colorado and we rely on natural cooling in the evening.
The previous batteries were also sealed lead acid.
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Old 06-16-2021, 10:17 AM   #9
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The previous batteries were also sealed lead acid.
Larry

And why I asked what kind of batteries you have. Sealed wet cell batteries are not the best choice as house batteries. Wet cell deep cycle batteries often have caps that can be opened to replenish the water, but maintenance free batteries donít and do not well with constant charging. AGM types are more forgiving especially with solar. My guess is the water got low and exposed the plates.
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Old 06-21-2021, 09:02 PM   #10
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Sorry to hear about your batteries.

You never mentioned the capacity in Ah of your house bank but 2.5 Ah continuous can add up quickly, 60 Ah in 24 hrs, then consider that the usable capacity of a lead acid battery is 50% or less of rated capacity and you can degrade batteries really quickly.

In this case it could have been a bad cell or other but might be worth another look at usable bank capacity vs loads.

I also learned a hard lesson in chronic undercharging using a ACR but pretty easy to run into that issue with a dedicated charger with incorrect settings for the bank as well
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