More later once I have time to troubleshoot it, but I suddenly had a problem tonight, just as I was about to leave work after closing time, with 80lbs of dog food on CrazyBike2.
Under a startup load (typically 60A+ for an instant), the battery would cut out as if it hit LVC, and require actually disconnecting the main power plug at the BMS from the battery itself, in order to reset it. It'd run fine just spinning the wheel, even with the bike weight on it, skidding on the ground, but if I tried to ride the bike, or have the load on the wheel enough to keep it from skidding/spinning, it'd cut out completely.
When I have hit LVC on it during the capacity testing I did, it only had to have the pack/BMS disconnected from the bike to reset it, IIRC (but i'd have to go back and check previous posts about that to be sure).
Unplugging the cell balance taps didnt' work, either, as I couldn't even get it to reset with them disconnected, while I was trying to do this to get home. It did work later, once I got home.
I started trying to measure at the balance taps for voltages, but my hands are so unsteady from being exhausted that I can't get good readings. Just typing all this is quite the effort, but I can't sleep due to worrying about the fate of ES
http://www.endless-sphere.com/forums/viewtopic.php?f=1&t=30607
after the buyout debacle began.
Since I would like to use the battery to ride with to work tomorrow, I put it on the charger and will leave it to run and hopefully balance some overnight, even though this will take away some evidence of what might be wrong. I'm sure I can fix that just by running a high load on the pack.
I suspect it's one of those strings that was running low during the discharge/capacity tests, or another runt cell coming to light after pushing the pack like I have been.
I PMd and emailed Cell_man to see what cost of new cells similar to what's in here might be, in case I need several (or more) to fix it (though mostly to repair another member's pack if it turns out to be cells on his similarly-built pack, once it arrives here and I can get to testing it). No response from CM yet, but I know he has some pretty busy times, sometimes.
More data/etc later.
Under a startup load (typically 60A+ for an instant), the battery would cut out as if it hit LVC, and require actually disconnecting the main power plug at the BMS from the battery itself, in order to reset it. It'd run fine just spinning the wheel, even with the bike weight on it, skidding on the ground, but if I tried to ride the bike, or have the load on the wheel enough to keep it from skidding/spinning, it'd cut out completely.
When I have hit LVC on it during the capacity testing I did, it only had to have the pack/BMS disconnected from the bike to reset it, IIRC (but i'd have to go back and check previous posts about that to be sure).
Unplugging the cell balance taps didnt' work, either, as I couldn't even get it to reset with them disconnected, while I was trying to do this to get home. It did work later, once I got home.
I started trying to measure at the balance taps for voltages, but my hands are so unsteady from being exhausted that I can't get good readings. Just typing all this is quite the effort, but I can't sleep due to worrying about the fate of ES
http://www.endless-sphere.com/forums/viewtopic.php?f=1&t=30607
after the buyout debacle began.
Since I would like to use the battery to ride with to work tomorrow, I put it on the charger and will leave it to run and hopefully balance some overnight, even though this will take away some evidence of what might be wrong. I'm sure I can fix that just by running a high load on the pack.
I suspect it's one of those strings that was running low during the discharge/capacity tests, or another runt cell coming to light after pushing the pack like I have been.
I PMd and emailed Cell_man to see what cost of new cells similar to what's in here might be, in case I need several (or more) to fix it (though mostly to repair another member's pack if it turns out to be cells on his similarly-built pack, once it arrives here and I can get to testing it). No response from CM yet, but I know he has some pretty busy times, sometimes.
More data/etc later.