question

mardhin avatar image
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
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

1 Answer
Daniël Boekel (Victron Energy Staff) avatar image
Daniël Boekel (Victron Energy Staff) answered ·

Hi @Mardhin

What are the cell voltages when fully charged?

4 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

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.

0 Likes 0 ·
Daniël Boekel (Victron Energy Staff) avatar image Daniël Boekel (Victron Energy Staff) ♦♦ mardhin commented ·

Hi @Mardhin

That's good! if all cells are above 3.45V when fully charged (no more amps flowing in), all cells are fully charged.

for perfect balancing, leave them fully charged for longer.

0 Likes 0 ·
Show more comments

Related Resources

Additional resources still need to be added for this topic