Which BMS for a 10S battery ?

[jallart]

Hi guys,

I got a 10S 5000mAh (2x[5S 5000mAh](http://www.hobbyking.com/hobbyking/store/__35809__ZIPPY_Flightmax_5000mAh_5S1P_20C_EU_Warehouse_.html)) and i would like to add a BMS on my board to make the recharging easier.

My motor is the APS 6374 170kv 3200W. If my motor is at is power max, i got 86A in the BMS (my weight is 200lbs).

So should i choose a BMS with the ability to reach 100A continious charge or a 60A will be enough because we will almost never reach this full power ?

I was thinking about to take this model : http://www.batterysupports.com/36v-37v-42v-10s-60a-10x-36v-lithium-ion-lipolymer-battery-bms-p-267.html what do you think about it ? Not too cheap ?

I found a lot of tuto for BMS cabling with home-made 10S3P but never with classical battery. Do you guys have a link to be sure to do well the cabling of the balance part ?

Thanks !

 

[jallart]

not so much success...

 

[Hillso]

you can buy much cheaper BMS if you bypass it for discharging. here is a diagram:

diagram for balance: http://imgur.com/SLHv2GK
[strike]or this: http://imgur.com/FrjRV4o[/strike] balance are wrong here

 

[jallart]

Thanks for your answer !
I only using 2 lipo batteries in serie so it will be easier
Question is, each lipo got a 6 wires balance connector, which ones of them are the 4 that I need tu connect to the BMS from each lipo ?

 

[Hillso]

oh sorry, my diagram is for 4s. you don't need to connect the first black wire to this specific BMS from aliexpress, so you only have 5 wires from each battery. you need to remove the farthest black wire. you can buy 2x 5s these and connect them to the 10 pin jst xh that comes with the BMS

 

[jallart]

Hi guys,

Thank your very much Hillso, i received my BMS and the JST XH yesterday and soldered everything.

I checked everything during the process, all the voltages were good on each wire (1-2-3-4-...) and between B- and B+ i got 37V perfect.

My problem comes from the P-, i soldered a DC 2.1 for my charger and checked the voltage. I got 31.4V... so i checked directly at P- and i also got 31.4V....

Is it a normal behaviour from this BMS ? Should i get 37V between P- and B+ ?

Thanks in advance for your help.
Julien

 

[Ryuudan]

I'm interested in that bypassing idea so you can use a 5A BMS instead of a 100A BMS making it much more affordable.

Does anyone have a full diagram of this bypassing AND the wires to the battery, esc and battery? I'm kinda confused, could be because its 2am though.

Gonna try and sketch something.

Should i get 37V between P- and B+ ?

I'm not sure what P- means, but it sure makes sense to read 37V from ground and B+ unless its somehow ignoring 2 cells.