bbshd on the fritz...

[karphead]

motor: bafang bbshd
battery: luna cycle dire wolf 52v
display: luna mighty mini

A few weeks ago I was riding in the rain and the power cut off to my motor. I unplugged the battery and tried the other port but when I did it created an arc and there was some smoke at the connect between the battery and the wire before I was able to unplug it. From that point on, if I tried PAS or throttle the BBSHD would work for a few seconds and then crap out. The battery showed full power on the display but there was no wattage being displayed at all when I hit the throttle/PAS.

To troubleshoot I went thru these steps (I don't have an extra battery to test):

-used voltometer to check battery output, which registered at 52v
-used voltometer to check wire connections with battery connected - no dead connections found

After checking the battery and the wires I decided to order another controller in case I fried it, I replaced it and it's still the same issue, not enough power to the motor. I say "not enough" because if I have the bike on the stand it will weakly continually respond to the throttle and the PAS but if I'm sitting on the bike there won't be enough to power move it. Still no wattage reported on the display and the battery power will start at 100% but go to 0% as soon as you apply the throttle/PAS.

I'm at a loss - my next guess would be that the BMS is malfunctioning but I have no idea on how to test that and batteries ain't cheap. Anyone have any ideas on how to confirm that?

[karphead]

Is it possible to hook up the charger to the motor directly? I haven't opened up the motor side yet either, so I'm wondering if I fried the motor core somehow. Will check that tomorrow...

[huffnpuff]

You'd probably blow the charger too if you tried that I would imagine.

[AZguy]

Doubt that would bother the charger - the have current limit as their inherent operation

I would set the current limit in the controller for whatever level you are testing at (PAS1?) at less than the charger output which won't be much

E.g. is the overall current limit is 30A and the charger is a 2A charger, then the current limit would need to be <2A/30A =6.67%... so set the current limit less than 6% in this example and it would likely work... better have a long extension cord if you intend to ride it though

[karphead]

You'd probably blow the charger too if you tried that I would imagine.

what the hell, i'm on a roll, lol

Doubt that would bother the charger - the have current limit as their inherent operation

I would set the current limit in the controller for whatever level you are testing at (PAS1?) at less than the charger output which won't be much

E.g. is the overall current limit is 30A and the charger is a 2A charger, then the current limit would need to be <2A/30A =6.67%... so set the current limit less than 6% in this example and it would likely work... better have a long extension cord if you intend to ride it though

thank you for the advice. i will err on the side of caution and try calling around to some bike shops to see if someone has a battery i can use to test it out. if all else fails I might give that a go...