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graham-thackray avatar image
graham-thackray asked

Battery Balancer (BMS012201000) lithium

Hi All

I have just purchased some 12v lithium batteries that have internal battery balancers but they do not connect to each other. There is two 12v batteries in series for a 24v system. In total 4 batteries 200ah each so 24v system with 400ah. As the internal BMS dont talk to each other I have installed a balancer.


System is charged from victrom MPPT solar charger with about 27amps of pannels, set to lithium


Is this a good or bad idea?

I have been getting error higher voltage on lower battery but if remove two batteries it seems to work normally, Do I get a second balancer and parallel it or remove the victron balancer from the system?

battery chargingLithium Battery
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1 Answer
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kevgermany answered ·

Firstly check the batteries are approved for series connection, some aren't.

Secondly, did you fully charge each battery individually before connecting up?

Thirdly, check all connections for tightness, cleanliness.


if you can, please check the battery voltages with a meter whhen disconnected.


On the balancer, only one is needed.

Please post a wiring diagram for us. The batteries should be cabled as shown in the balancer manual.

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