Hey folks,
I installed a KT36/48SVPR-20A with a 48V battery on an old Wisper bike with a BFUN8 250W, and it's been running great until the other day.
Suddenly (after my wife used the bike to pull a heavy trailer) the power cuts out as soon as the load increases slightly.
I noticed this happens both on throttle operation and PAS. But it happens only when the bike is on level 5 of PAS (max). On throttle it occurs regardless of power level set.
If I pedal (on 5) it cuts out pretty much right away. On throttle I can ease it into running if I increase it very very carefully, but as soon as it's not flat or I pull it just a little too fast it cuts out right away. I then have to release the throttle and start over.
What could be the problem? (I've pulled heavy loads with the bike before, but probably more carefully than the wife may have done - I mention this as I have nothing else to go on that may have caused the problem, but not sure this is related to the heavy trailer)
Some suggestions I have had earlier:
1. Battery
It seems unlikely to me as it's a quite new battery Hairon 48V 14.5ah with LG cells. I should mention the battery was in storage for about 18 months before being installed. It has been running flawlessly for 6+ months though, and charges up to 54.9V.
2. Damaged wires to the motor
I have not found any.
3. Damaged FET(s) in the controller after overheating due to pulling heavy load.
I am sortof "hoping" it's the controller, as this is way cheaper to replace than the battery, but if eveything points to the battery, maybe it's not worth buying a new controller?
Thoughts anyone?
Thanks
chris
I installed a KT36/48SVPR-20A with a 48V battery on an old Wisper bike with a BFUN8 250W, and it's been running great until the other day.
Suddenly (after my wife used the bike to pull a heavy trailer) the power cuts out as soon as the load increases slightly.
I noticed this happens both on throttle operation and PAS. But it happens only when the bike is on level 5 of PAS (max). On throttle it occurs regardless of power level set.
If I pedal (on 5) it cuts out pretty much right away. On throttle I can ease it into running if I increase it very very carefully, but as soon as it's not flat or I pull it just a little too fast it cuts out right away. I then have to release the throttle and start over.
What could be the problem? (I've pulled heavy loads with the bike before, but probably more carefully than the wife may have done - I mention this as I have nothing else to go on that may have caused the problem, but not sure this is related to the heavy trailer)
Some suggestions I have had earlier:
1. Battery
It seems unlikely to me as it's a quite new battery Hairon 48V 14.5ah with LG cells. I should mention the battery was in storage for about 18 months before being installed. It has been running flawlessly for 6+ months though, and charges up to 54.9V.
2. Damaged wires to the motor
I have not found any.
3. Damaged FET(s) in the controller after overheating due to pulling heavy load.
I am sortof "hoping" it's the controller, as this is way cheaper to replace than the battery, but if eveything points to the battery, maybe it's not worth buying a new controller?
Thoughts anyone?
Thanks
chris