question

farmlad avatar image
farmlad asked

BMV 700 showing Volts but no battery %

All my negs. go to correct terminal of smart shunt-mppt inverter fuse box. Smart shunt neg. to 200ah LifeOp4 battery.

BMV 700 display shows 13.14 volts

0.0% battery. Battery graphic is outline only not solid.

All parameters are set for LifeOp4.

Battery terminals read 14.33volts with meter

What am I missing?

BMV Battery Monitor
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1 Answer
Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

What do you have? BMV-700 or SmartShunt?

After the installation you have to do a full charge cycle to synchronize the SOC to 100%.

Can you show us the settings?

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farmlad avatar image farmlad commented ·

So I connected VE Bluetooth to bmv 700 (not done before) & entered % value for 13.14 at 97% (guess) & all good. I think I must have reset everything when I removed battery to charge via shore line 240v

(v cloudy recently ). I left for 2 weeks with no power draws, mppt still charging & battery percentage was at 4%.

Bmv 700 with the shunt, not smart as I said.

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Matthias Lange - DE avatar image Matthias Lange - DE ♦ farmlad commented ·
After disconnecting the battery the BMV will lose the sync and it needs to be synchronized again.

Is the negative of the MPPT is going through the shunt to the battery?
Nothing is bypassing the shunt?

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farmlad avatar image farmlad Matthias Lange - DE ♦ commented ·
Correct. All to shunt. So I need to hit synconize?
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Matthias Lange - DE avatar image Matthias Lange - DE ♦ farmlad commented ·

If you know that your batteries are at 100% you can do that manually.

But if all settings are correct the BMV should do that automatically if you do a full charge cycle.

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farmlad avatar image farmlad Matthias Lange - DE ♦ commented ·
I’m on the right path. Thanks for verifying. Bring the sun. Rain is falling in buckets in Somerset uk.
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