Fardriver 72300 disconnects randomly and won't reconnect.

[2darnfa5t]

I recently purchased a Fardriver72300 and followed all the autolearn steps, watched numerous videos, and even reset it the other day. However, I'm encountering an issue. When I plug in the controller, it functions normally at first. But if I go for a ride or leave it connected without doing anything, the controller disconnects. Once it disconnects, it won't reconnect for some time, seemingly until a specific condition is met. My guess is that it reconnects when all the voltage is drained because I put some resistors on it, and it reconnected once.
The second part of the issue is that with the battery at 64.9v once it is connected to the controller it fluctuates between 34-36V when it won't connect. I should probably add, that when I say it won't connect it also does not power the motor at all. The third-party seller hasn't been much help, and I'm considering returning it while I still can. I just wanted to see if there might be an easy fix before going through all that trouble. Any help would be greatly appreciated.

 

[amberwolf]

If the battery voltage actually drops that much, as measured with a separate voltmeter or multimeter, there's something wrong with the battery itself that can't support any load, or something in the controller (blown FETs, reversed wiring, etc) is placing such a high load on it that it's BMS turns itself off.

If what you are seeing is only thru the controller display / etc, it could be a fault there in what it detects ratehr than reality, and you should make sure that the battery voltage really is, as measured at the controller/battery connection point (on the controller side of it).


If the battery drop is real, then it is probably what is keeping the controller from working normally. (or the ocntroller is damaged and ti's what is causing the battery problem)

 

[2darnfa5t]

If the battery voltage actually drops that much, as measured with a separate voltmeter or multimeter, there's something wrong with the battery itself that can't support any load, or something in the controller (blown FETs, reversed wiring, etc) is placing such a high load on it that it's BMS turns itself off.

If what you are seeing is only thru the controller display / etc, it could be a fault there in what it detects ratehr than reality, and you should make sure that the battery voltage really is, as measured at the controller/battery connection point (on the controller side of it).


If the battery drop is real, then it is probably what is keeping the controller from working normally. (or the ocntroller is damaged and ti's what is causing the battery problem)

Well the only thing keeping me from thinking it is the battery is that it does this with my normal pack and also my new pack. Old pack is a 16s9p 32ah 100a constant 140a peak and my new pack is a 16s1p LG E66A 64.5aH 200a constant 500 peak. Also if I leave it disconnected for some time and I go to connect then pair I can go in and auto learn or what not. I even made it .5miles down and back to the store the other night. But sometimes I can’t make it out the door before it disconnects. It does that with or without the bt dongle too.

 

[2darnfa5t]

If the battery voltage actually drops that much, as measured with a separate voltmeter or multimeter, there's something wrong with the battery itself that can't support any load, or something in the controller (blown FETs, reversed wiring, etc) is placing such a high load on it that it's BMS turns itself off.

If what you are seeing is only thru the controller display / etc, it could be a fault there in what it detects ratehr than reality, and you should make sure that the battery voltage really is, as measured at the controller/battery connection point (on the controller side of it).


If the battery drop is real, then it is probably what is keeping the controller from working normally. (or the ocntroller is damaged and ti's what is causing the battery problem

Well the only thing keeping me from thinking it is the battery is that it does this with my normal pack and also my new pack. Old pack is a 16s9p 32ah 100a constant 140a peak and my new pack is a 16s1p LG E66A 64.5aH 200a constant 500 peak. Also if I leave it disconnected for some time and I go to connect then pair I can go in and auto learn or what not. I even made it .5miles down and back to the store the other night. But sometimes I can’t make it out the door before it disconnects. It does that with or without the bt dongle too.

Now that I read that and think about it a little more it could be the FETs are damages but not completely and pulling that power and the controller low voltage is shutting it off. Because my low voltage is set to 45v i will trouble shoot that some more. Thanks for your insight.