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mardhin asked

Smart Lithium Battery in Series not Balancing

we have 4 Smart Lithiums batteries 12.8V in Two Strings parallel in Series for an 25,6 V Systems. We have charged all Batteries to 14.2v and then put them togehter. After 30 days the Batteries at the negative Side get charged between 14.27 to 14.35 and the Batteries on the positive Side get charged only between 13.98 to 14.07.

After 8h of balancing the difference is getting better but only a little bit. We tested all Connections and Charched the Batteries again seperatly.

But the Problem is still there. Now our Victron Dealer told us to install an Balancer!!!

Lithium Battery
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Daniël Boekel (Victron Energy Staff) avatar image
Daniël Boekel (Victron Energy Staff) answered ·

Hi @Mardhin

What are the cell voltages when fully charged?

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mardhin avatar image mardhin commented ·

They are in an range 3.49to 3.54 in the low charged batterys and 3.54 to 3.61 in the high charged batterys. The difference between the cells in one battery can be up to 100mv and after balancing more times and over 2 h still 30-50 mv.

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