Batteries, Chargers, and Battery Management Systems.
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rupy   1 mW

1 mW
Posts: 11
Joined: Sep 24 2016 6:26pm


Post by rupy » Apr 05 2018 6:07am

Does the BMS handle cutoff voltage?

How come a 36V pack and BMS require a 42V power supply?

GalFisk   10 mW

10 mW
Posts: 22
Joined: Aug 30 2014 11:48pm
Location: Sweden


Post by GalFisk » Apr 15 2018 1:33am

The BMS normally handles overvoltage, undervoltage, overcurrent and short circuit in addition to balancing. Check out the specs to see that the one you buy actually does all that.
36V is the nominal voltage, which is the voltage when the battery is about half full. You ned 42V to get it completely full, and the low voltage cutoff is at maybe 27 volts. Li-ion has a pretty big voltage range from full to empty, and wear out rapidly if taken outside the limits (even being near the limits causes wear, but some wear is deemed acceptable in order to get good capacity).

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