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Do it yourself battery management system for Lithium ion battery packs/cells

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hi, can someone help me with an advise ?
i am close to finishing my batteries which contain of 4X14s200p li-ion cells… how many BMSs and control boards do I need in order to monitor my batts?

one for each cell group, and then one controller.
so 56 cell modules and one controller.

Correct me … it turns out that will not work balancing in each group where 200p? Only how will the balancing work between groups…

There is no balancing between the 4 battery packs.

Every cell board is responsible for it’s cell.
As soon as a cell over volts the board begins to burn energy.

This is reported to the controller.

If installed the controller communicates by can or 485 with the loader.
And limits the current.