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withalligators avatar image
withalligators asked

Battery SoC entering float at 95% within last few days with 150/85 and BMV700

Hey folks,

I have 981w of PV on my sprinter, going to a 150/85 and 400AH of lifepo (4 x 100AH battleborn units). Within the last few days, the charger has started floating the batteries at 95%. The system is just less than a year old.

Settings are 14.4V absorbtion for 1hr20m. Float at 13.6 for a while, it was floating about 0.2V higher, so I had it down to 13.4, but it eventually started floating at 13.4 so I turned it back up to 13.6 and it seems stable there.

Any ideas on addressing the 5% of the batteries the charger won't Bulk?

battery capacity
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2 Answers
nebulight avatar image
nebulight answered ·

What is your charged voltage, tail current and charged detection time set to on the BMV? It's not that the battery isn't charging to 100%, it's probably that the BMV settings need adjusted for it to register 100 SOC.

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withalligators avatar image withalligators commented ·

Charged voltage is 14.4, tail current is 4.00%, charged detection time is 3m. These are the settings Battleborn recommend for this bmv. It was reaching 100% a few days ago. The change is kinda sudden, and interesting it's a full 5 percent.

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withalligators avatar image
withalligators answered ·

Now it's hitting float at 94% the last 2 days. I also don't think it's entering an absorb state. If it is, it's very quick and definitely not the 1hr20min it's set at.

Because it's not hitting 100%, it's reading my last discharge as one from several nights ago.

Guys, is this something I can nip in the bud before it gets worse? I'm starting to get concerned.

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klim8skeptic avatar image klim8skeptic ♦ commented ·

Look at the history of the Mppt, and what firmware version?

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withalligators avatar image withalligators commented ·

MPPT is firmware 1.37, here is the history from it:

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