hyperdrive
1 mW
- Joined
- May 9, 2018
- Messages
- 13
I've been commuting with a BBSHD bike using 52V packs for over a year now, putting about 800 km a month on the bike, on average. I'm running the full 30A (1500W peak), but usually average closer to 300-500W while riding. So far I have fried 4 controllers on two different drive units. Three of the failures appeared to be power FET related (just no more drive power), while the last one causes communication errors before the drive stopped working.
What is perplexing me is that the failures have not occurred at times when the motor was particularly hot, and there has been no evidence of water getting inside the controller unit. While I do run the drive at the full 30 amps for a minute or so here and there, I don't think I'm being overly hard on it.
I'm starting to wonder if the voltage rating on the electronic parts might just be too close to the upper limit of the 52V pack (almost 60V), and with transient voltages, the components are seeing voltage stress and failing over time. I think the power FETs are 75V rated, which is a little close for comfort, but does anyone else have experience with this, or have an idea of the voltage rating of the components in the BBSHD controller? I also have a BBS02 that has been running of 52V packs without issue for several years, but it has not seen all that much use. Would a 48V pack likely be more reliable?
What is perplexing me is that the failures have not occurred at times when the motor was particularly hot, and there has been no evidence of water getting inside the controller unit. While I do run the drive at the full 30 amps for a minute or so here and there, I don't think I'm being overly hard on it.
I'm starting to wonder if the voltage rating on the electronic parts might just be too close to the upper limit of the 52V pack (almost 60V), and with transient voltages, the components are seeing voltage stress and failing over time. I think the power FETs are 75V rated, which is a little close for comfort, but does anyone else have experience with this, or have an idea of the voltage rating of the components in the BBSHD controller? I also have a BBS02 that has been running of 52V packs without issue for several years, but it has not seen all that much use. Would a 48V pack likely be more reliable?