BMV-712 shows SoC at 1% even after I fully charge and manually reset to 100%

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thomaspline asked Sep 22, '20

BMV-712 shows SoC at 1% even after I fully charge and manually reset to 100%

Hi all! I have a van electrical system that is based off of this:

I have two 200ah AGM batteries and two 175w solar panels. My solar charge controller is a MPPT 100|30 (which I have a bluetooth dongle for). The battery monitor is the BMV-712 which is connected via the shunt included (which connects the negative side of my battery bank and the negative bus bar).

My problem is that my state of charge permanently shows 1% even after fully charging using my shore power plug-in. Nothing happens when I press the "synchronize SoC to 100%". When I manually set the SoC to 100%, it changes for about 2 seconds and then automatically reverts back to 1%.

Any ideas?

BMV Battery Monitor

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michelg commented · Sep 26, 2020 at 01:46 AM

Hi Thomas ! Ok, I will change charge efficiency factor to 80%, then current threshold to 2.0A, and time to go to 30 minutes. I have such kind of parameters in my setup if I remember right.

I'll check tomorrow, and let you know the exact details.

Michel

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Modifications Space

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Answer 1 · 2020-09-22T18:01:26Z

michelg answered · Sep 22, 2020 at 06:01 PM

Hi Thomas... Not sure, but if I remember right there is a direction flow with the BMVs and shunts. I suspect you inversed it ... Take a look at that picture, it might help.

Michel

schema-montage-bmv700.png (576.7 KiB)

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thomaspline commented · Sep 24, 2020 at 05:37 PM

Thanks for the response. I checked the direction of the shunt and it is correct. I have it oriented as you do in your diagram with the battery on the left, the connection to the solar charge controller on the right, and the connection to the read-out panel from the bottom. Any other ideas? I feel like switching back to 1% is a huge clue, but I have no idea what it means.

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Answer 2 · 2020-09-24T18:40:43Z

Cyrille GIRARDOT answered · Sep 24, 2020 at 06:40 PM

and all configuration settings are correct?
and all other readings, voltage, Ah, middle voltage, are ok?
very strange !!

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Answer 3 · 2020-09-24T20:09:33Z

michelg answered · Sep 24, 2020 at 08:09 PM

Hi Thomas ! any chance to get the parameters from the BMV-712, using the VictronConnect App (bluetooth) and publishing all the captured screens here ?

Thanks, Michel

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thomaspline commented · Sep 25, 2020 at 11:10 PM

**note** The black/red 4g wire that is coming from the white sterling battery to battery charger (via a fuse) goes under the floor to the front of the van and hooks to the starter battery and thereby the alternator.

Hope these images help!

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klim8skeptic ♦ thomaspline commented · Sep 26, 2020 at 12:03 AM

You have State Of Charge set to 1%.

It might be worth setting this to 100%.

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bmv-soc.png (50.2 KiB)

thomaspline klim8skeptic ♦ commented · Sep 26, 2020 at 02:23 AM

When I manually set the SoC to 100%, it changes for about 2 seconds and then automatically reverts back to 1%.

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klim8skeptic ♦ thomaspline commented · Sep 26, 2020 at 02:42 AM

You are manually resetting your SOC to 1%.?

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bmv-soc-2.png (56.5 KiB)

thomaspline klim8skeptic ♦ commented · Sep 26, 2020 at 03:03 AM

I type in 1% and it automatically changes to 100%. It changes on it's own.

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