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ddrueckh avatar image

SmartShunt Settings

I have a question regarding the SmartShunt. It says to set the charged voltage to .2-.3 below the float voltage set on my SmartSolar MPPT 100/30 controller. I am using two 6 volt GC2 batteries and have my controller float set to 13.5. Therefore the SmartShunt charged voltage is set to 13.2. With this setting, it seems that my shunt resets to 100% full when the controller is still in bulk charging and above 13.2 volts. Shouldn't the shunt show a 100% charge only after the controller finishes charging and switches to Float? Thanks.

BMV Battery Monitor
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Paul Green avatar image
Paul Green answered ·

I am not sure of this answer, but let me try and see if anyone corrects me if I'm thinking wrong.

The SOC is not dependent on what the charger is doing. It's based on actual voltage not charging voltage or surface charge in the battery bank.

A fully charged battery is between 12.6v to 12.8v. So, that's 100% SOC. Battery chargers routinely apply voltages higher than this to fully charge the battery. But the Shunt should not read that voltage but only your battery bank's actual voltage.

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