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BMS confussion 16S or 17S -- CF-20S90A-A

Posted: Jun 01 2019 9:10am
by damnub
Hello!

I wanted to wire up my (what i thought was 16s) BMS to my 16S Li-ion pack but Im thinking that it might be 17s. The serial number is CF-20S90A-A. which would be 20S but 3 diodes are not soldered. Image

The balance wires are also confusing to me, it has 19 pins but 2 of them are seperate:
Image

the only wiring diagram i found online is this one: Image

Here is the full album of images: https://imgur.com/a/qqUmyvR

Im wondering if anyone here used the same bms and has some tips.

Thanks for reading all of this.

Re: BMS confussion 16S or 17S -- CF-20S90A-A

Posted: Aug 07 2019 9:21am
by evwayne
yeah bro, i've got the same board with same confusion with same problem. i've ordered 16S BMS, and they send me this. and it already took 1 month to get delivered, now I'm stuck with this. kindly help me if anyone have the any idea about how to connect this.
my mail id: lyricsworld96@gmail.com
and
this is where I bought : https://www.banggood.in/60V-16S-45A-Li- ... rehouse=CN
Thank you in Advance guys.

Re: BMS confussion 16S or 17S -- CF-20S90A-A

Posted: Aug 07 2019 12:10pm
by damnub
ahh exact same problems I see..

I actually fixed it by buying another 16s BMS with clear instructions, kinda the cowards way out but atleast my battery is charging right now!

I bought this one: https://nl.aliexpress.com/item/32889172 ... 4c4d6oB16y
it arrived with a instructions printed on paper.

I dont know where you are located but a tip, if you select aliexpress priority shipping it arrives in 5 work days (to me atleast) and its only 50 cents more :)

Re: BMS confussion 16S or 17S -- CF-20S90A-A

Posted: Nov 29 2019 12:26pm
by geoff57
I have the same bms configured as a 14s 45a.
I have no problem with the number of cells it works with and an wire up the balance wires with no problem, from using previous similar bms boards I know how to wire up the positive power wires. The problem I have is with the negative power wires. I presume the negative from the battery goes to B-, charge negative goes to C-. Where does the discharge wire go I would guess at C- as well.
Could anyone that has used this bms give me an opinion on this.
Geoff

Re: BMS confussion 16S or 17S -- CF-20S90A-A

Posted: Dec 16 2019 3:33pm
by Darren2018
B is for the battery negative and C is for discharge. You can wire these up for any number of cells in series providing the components are on the board as each line has its own DW01 style IC. Cut off the remaining cables that you don't use when you get to the last connection of your pack.

Re: BMS confussion 16S or 17S -- CF-20S90A-A

Posted: Dec 16 2019 4:33pm
by john61ct
All that assumes a "common port" design where the same FET controls charge and discharge protection.

Exactly the same board may be sold as "separate port", with different wiring at the pack level

just FYI