Korishan said:
P+ (3 & 4) is common Positive leads.
A- and P- are your negative lines
I would guess that P is for Pack.
If you look at the traces, 3 & 4 are the same terminal as the green trace runs around the right side of the board. All the FET's are connected to the common Pos side.
It looks like there is a current shunt between 1 & 2 and that is how it monitors the amps coming in and going out of the pack.
Again, that's a guess
Ahh yes.
A- could mean Ausgang - (German for output).
So most likely:
1: output -
2: input - (from battery)
3:
4:
does it matter which + is connected at what P+ (3 &4)?
Well I carefully wired it up and its reading a correct voltage out of the socket. So thats seems to have been correct. No sparks or smoke or anything
However its not charging so, There was this other cable with the BMS that goes into a slot next to the A-. The wires are the exact same arrangement as the ones coming out of the other socket I have. So im guessing there is a communication that needs to take place between the charger and BMS. Thats how the other BMS does it that I have from the same company.
I got this 36v pack, it was discharged to 14V :
So I carefully had it plugged in to a charger and I turned it up to 22V and 0.6A. Then i turned it up to 38V and it automatticaly increased amperage, dont know how much but it was a lot and all of a sudden the pack was at 30v...
So my plan of carefully psuhing it up failed.
Plugged in that other BMS i had and started charging. Two banks of 4 cells shot up in voltage and the otherswere somewhat similar. So there was an issue somewhere. Not sure if maybe these cells are just crapped out now :
trying this BMS instead, this one was the original one for this pack.