Bad BMS?

[Blackgolem]

BMS is giving low voltage at c and b- pads is there a fix? Or is it ash canned. Was working and just ate it when I wanted to test ride my diy moped.

 

[harryS]

In BMS terminology, C- and P- are the negative terminals of the charge and discharge plugs. B- is the negative end of all the cells, The voltage from B- to either one is very low, almost zero if the BMS is working.

You're not getting any voltage across the output pins? Check your 20 cell groups, Each one has to be within 4.2 - 3.0V for the BMS to work, Otherwise, if any are well below 3.0 it shuts off the battery. You also need the B0-B20 wires to be in sequence, or the BMS doesn't work. If all of that checks out, then the BMS must be bad.

 

[Blackgolem]

Hey thanks for the reply. I solved my issue, it was a trace burned up off the board. I took the black paper off the back and the screws and cover where the trace was broken, I took 3 strands of copper, and although the trace was brass I soldered them to the trace and tada its back in service. I wouldn't have thought that. Same thing happens to 12v step-down converter when they stop working. Heck of a thing if I hadn't I'd be buying another bms. Hope this helps others with similar issues, deuces to the yn's peace to the og's.