0V on BMS P- terminal
I've got a commercially manufactured 36v battery that has 0 v on the outgoing power terminals. I took the cover off and found 38v on the actual battery terminals and of course 38v going into the BMS. I figured it had to be a BMS failure so I replaced it with one of your BMS's. Same problem. Call this BMS A. I figured I must have gotten unlucky and had two bad BMS's so I opened up a working DIY battery and took the BMS out of it (call this BMS B) and swapped it with BMS A. BMS A worked fine when I attached it to my DIY battery; 38v on the output side just as I would expect. I hooked up BMS B to the manufactured battery and it had 0V on the output side! As you know the wiring is simple. I have the wire from the ground side of #1 bank of the battery going to B- on the BMS and I'm looking for voltage between the positive terminal of battery bank 10 and the P- terminal on the BMS. I've tried the setup with the balancing wires connected AND disconnected. No change. Any ideas?