Sunday, May 8, 2022

Re: [electricboats] LifePo4 build questions

Definitely build a single 36 volt pack with a single BMS. That's the only way to balance cell voltage across all the cells. To determine the the number of cells, divide the charger's open circuit max voltage by 3.5 and then round up to the whole number. I recommend a JK-BMS with active balance. It's a-ok if it supports more cells than you need (eg, a 16S BMS for a 36v 11S BMS battery). I suggest going over your anticipated current requirements by 100% so that the cells and BMS is not stressed during heavy loads.
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