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Balancing 8x6v (48v) system with two balancers

first time poster looking for help with battery balancing


I am working on an electric boat conversion using 8 golf cart batteries (flooded lead acid 6v) wired in series. I purchased two of the HA02 balancers (https://www.amazon.com/dp/B07L8WKKC3/ref=cm_sw_r_cp_tai_LG1AFb4RAXD3P) which each can balance 4 batteries of up to 12v each. i have wired the first to batteries 1-4 and the second to batteries 5-8. This is working well but it does still allow imbalances to occur between the first 4 and last 4 batteries in series.

I have seen people mention that it might be possible to balance all 8 batteries but it would require a 3rd HA02. I am not sure exactly how the wiring would look on this. Can anyone help me out?

second - I was thinking through how it might be possible to balance across the entire bank without adding a third balancer. I was curious if it might be possible to sort of parallel the Two balancers to monitor all batteries. My thought was to wire each input to overlapping pairs of batteries (therefore giving each 12v). This would be wired as:

balancer 1: 1/2, 3/4, 5/6, 7/8

balancer 2: 2/3, 4/5, 6/7, blank

in your opinion, would this work and be safe? Or are there other issues I am not seeing?

Battery Balancer
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