question

ronster avatar image

SmartShunt reset SOC reset problem

I have Smart Shunt installed on my boat with Lithium SuperPack 25,6V battery for trolling motor use. All is working well when using the motor, but somehow Smart Shunt keeps resetting SOC to 100% after use. For example, yesterday after use SOC was 80% and today it showed 100% instead of the correct SOC 80%. What causes this automatic resetting to 100% after a while? Meanwhile there is no current drawn from the battery except what the SmartShunt itself draws nor it’s charged. I have disabled the Battery starts synchronized option (it’s OFF) and haven’t disconnected the shunt from the battery. I think I may have some option or setting incorrect, so what would be the ideal settings for the battery in question? All the help would be greatly appreciated, because the correct SOC reading is very important when out fishing so not to drain the battery completely.

smartshunt
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3 Answers
borowar avatar image
borowar answered ·

Hi! I have the same problem!!!!
I've just installed this week the Smart Sunt 500a on my van. Every time that I restart the Victron Connect app (iphone) the State of Charge is 100% but I know that isn´t correct because i'm seeing the voltage. The Shunt is always connected to the battery.

I´ve read the manual but i don't know what is the better setting. Battery starts synchronized ON or OFF or maybe manually set the state of charge value every time?

Thanks in advance.

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JohnC avatar image
JohnC answered ·

Hi @Ronster

The Smartshunt/BMV will synchronize when the 'Charged Voltage' is exceeded and the charge A is lower than the 'Tail Current' (for the Charged Detection Time).

You can't turn that off, but you can raise the CV higher so it doesn't happen. If you still want it to sync automatically under charge, you'll need to find the right V by watching your batts and determining a suitable level. With Li's this might take a little trial'n'error, as the range you have to work with is far smaller than Pbs.

Or just sync manually when you know they're fully charged.

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ronster avatar image
ronster answered ·

Thanks for the help! I think I found the reason which is that I have accidentally left the charged voltage at the default setting 0.0V. It should be 26,7 for my battery if I understood the specifications (battery float voltage 27V and setting should be 0.2-0.3 below that).

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