New Batteries: Low voltage despite low usage

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leavenotrace asked Jun 29, '20

New Batteries: Low voltage despite low usage

I just installed 2 new Duracell AGMs (100ah) in my camper. I reset the history on my BMV700. Watched a few hours of TV last night, ran the water pump a few times. Wake up in the morning to my batteries at 12.24V.

BMV shows SOC at 94% and only used 19AH. Why is my voltage so low? Did I get bad batteries?

BMV Battery Monitor SOC battery system voltage

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Alexandra ♦ commented · Jun 29, 2020 at 05:51 PM

Normally batteries do not come with a full charge.

You may need to make sure they are charged up fully then recalibrating your bmv to the full charge.

Is the bmv programmed otherwise for your specific batteries?

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Answer 1 · 2020-07-05T03:24:38Z

schlanbusch answered · Jul 05, 2020 at 03:24 AM

I think Alexandra is right.
At 12,25V your batteries are close to 50% SOC
So a good charging, and then reset the history should do it

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