question

Hi Trend23,

I am using the same kind configuration. In my case, I have a 2s2p setup instead of 2s3p setup like yours. I have 2 battery balancers (BB): one for each 24v serie.

Be sure you have the "24V" of each BB directly connected to the positive post of the top battery of the monitored series. Same for "0V". In your current diagram, you connected the "24 V" of all BB to the same top battery and you connected the "0V" of all BBs to the same bottom battery. In high current application, you can have small voltage drop in cables. So, it is preferable to connect the 24V and the 0V of each BB as close as possible to its associated series.

There are 2 approaches wiring approach when dealing with multiple 24V series in parallel.

A) Without cross-connect midpoint (the blue wire in your diagram)
B) With cross-connect midpoint

For option A, you need to have one battery balancer per series. This what you have.

For option B, you might need just a single battery balancer. Howerver, you MUST to have a SmartShunt with midpoint voltage tracking in your setup. This is required per Victron doc.

Personally, for battery bank monitoring purpose, I prefer to NOT connect the middle. It costs extra BBs. However, you can easily have access of the volatge of each battery with a multi-meter. In my opinion, a cross-connected midpoint just put dust under the carpet. Some people might disagree.

Regards,

-François

Thanks, I will use Option A. Good point on moving to the positives of each bank. Option A also allows me to individually check the voltage of each battery where my balancers are located. This is much more convenient for me than where my batteries are located.