BMS 4s - 20P

[nicolaspumis]

I am working on a 18650 battery 4s 20packs total of 800 wh
what bms should I use

 

[kdog]

Bms's are rated by 3 factors
Chemistry
No. of series groups
Max and continuous amp limit
Chose one that suits your needs based on this.
Give yourself 50-100% headroom on amp limit as its usually overrated.
Without details on your specific needs this is all I can give you.

 

[john61ct]

20 packs?

or 20P4S, 20 cells in parallel, 4 groups in series