I’ve Been Riding my board reliably for a few months, but when on a ride the other afternoon, my board completely shut down.
I restarted the board and it worked completely fine on the way home.
However, the day after that, my board shut down and wouldn’t turn on…
When I tried to power back on, the battery meter went from 4% to 0% slowly.
However, when I tried to power it back on after the the fifth time, with my board upside down, my board shut on, and went back to 74%. But shortly after, my board shut down again, doing the same thing…
I went to go open up my board, and I measures the battery pack’s voltage, 47.2V, okay.
Then I went go go measure the B- port on my bms, and that, too, read 47.2V. But, when I went to the P- port, the voltage read 3.3V…
I’m thinking the bms has a problem, but I cannot flip the BMS upside down due to how its secured to the enclosure.
But, if I have to, I will take the BMS out.
Do you guys think the BMS is toast? Or should I take the BMS out and see if anything is burnt, because from the top (Heatsink side), It looks okay.
Any advice is greatly appreciated!
I agree. Sounds like a loose connection. Especially considering the upside down board “test”. Check solder joints in xt60/90 if you are using them. Check at the bms connection too.
I’m using 2x 8000Mah Lipo batteries in series.
I do agree that a cold/loose solder could be the issue, but when I measured the B- (input) terminal and the positive end of my battery, I got a voltage reading of around 47V, but when I measured the P- (Output) terminal of my bms, it read about 3V.
So I think the issure is between the B- terminal and the P- terminal, and the BMS is right in between those…
I am going to go re solder the B- and P- connections later today and see if that solves the issue, if not, I’ll take out the bms to inspect it.
I have a 80Amp Bestech BMS. (Not Bypassed)