Bambam333

Hi there, I've just finished my 14s3p battery and managed to fully convert my bike, it has consistent power, but only down to 50v... After this the battery cuts out, after unplugging and plugging back in it works but not under too much load... So, I figure the BMS I have used has a cut off of 50v even though that works out that I only use about 15% battery after a full charge. Of course, this won't do it any good over time, plus I'm disappointed I can't make it to work and back as I'd hoped! Can someone tell me please, do I need to take my battery apart and install a BMS with a lower cut? If yes, please help with some good UK suppliers if possible, I'm desperate!

Thanks for the fast response! I actually miscalculated the battery configuration to begin with as the nominal voltage of my cells was 3.6v and not 3.7 that I had used to work out my final pack voltage... (I know...rookie! ) So I actually fully charged all cells seperately before welding, tested all points meticulously to ensure the voltage was constant, the overall voltage was 54. 6v when the pack was complete. I then rode it for up the road, it cut out. It will only charge to 45.5v now.. I'm a little concerned I have damaged the pack in some way, as you say it is the root cause, I will try to charge for a whole day and see if I get anywhere! Although one thing to mention, I am using a58.8v charger... (I hoped I could get away with this as long as I checked the voltage whilst charging...) will this be an issue still? Many thanks!

Hi there, I've recently finished building my 13s 3p battery with Samsung 25r 18650 batteries, which has left me with a voltage of around 45v when charged, When first built I managed to ride 200m down the road, before it all suddenly went black... I returned home and put the battery on charge, the controls would then work when on charge, motor would operate etc. But as soon as I took it off charge it would die after a couple of seconds... I'm sure this is a voltage cut off issue with the controller I'm using, but I can't figure out exactly why as my controller is 36/48v 20a, my bms is rated at 60a, so is it that the 45v my battery is at is just enough to trick the controller into thinking I have a 48v battery on low power? But not low enough for the 36v limits? Any ideas would be greatly appreciated!I have been considering buying a 36v controller but don't feel like wasting any more money if I can help it! Many thanks