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Daly Waterproof 20S 100A Lithium Ion BMS, with Balancing
Daly Waterproof 20S 100A Lithium Ion BMS, with Balancing
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Daly Waterproof 20S 100A Lithium Ion BMS, with Balancing

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A battery management system (BMS) is essential in a lithium ion battery build. Li-ion batteries are much more sensitive to voltage than lead acid, and can be dangerous if over- or under-charged. It protects against over- and under-voltage as well as over-current, and ensures that the cells are balanced. This BMS is for a 20S (74v nominal) lithium ion battery, and allows 100 amps continuous discharge and charge current. That's 7200 watts of continuous power. Wow!

To wire, you will need to solder battery and charge/load ground to pads on the board. You will also need to tie each of the balance leads into the individual battery cells. Note that this does NOT have provision for separate charge and load, as some boards do. Balance wiring is not shown, but is included.

This BMS is suited for big projects, but don't expect it to be adequate to protect a large build such as an off-grid power wall. This is perfect for eBikes, scooters, electric karts, etc., up to 7200 watts. And the case is waterproof, so you can ride anytime, anywhere.

 

See photos for specifications.