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I have to mention that manually bottom balancing a 18 cell pack once a month (if it even needs it) can be pretty trivial, next to being a guniea pig. Usually you take 18 readings with a voltmeter before hooking up the charger and see if any need to be bled down with a resistor and some alligator clips.
You don't get any guarantees with the experimental approach. But if you are up for it and mechman wants to experiment w/the hardware then have at it.
I forgot current sensor FYI, and a relay if this is going to override the contactor. Guess you have room for amps in the lower right.
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