Originally Posted by
chris301up
Just another update.
I have now disconnected and by-passed the BMS from within the battery pack, taken it out for a test ride, and sure enough - IT WORKS !!!
There is the odd intermitant hesitancy (cut out) particularly under full throttle, but I would now probably assume this is due to a bad cell?
At least it has given some idea to where the fault lies.
My only problem now is to find out what the AH is on the existing battery so that I can order the correct replacement.
Chris,
Congratulations on tracking down the issue. Now what you really need to know is the maximum continuous discharge rating for the controller. The BMS has to allow the maximum amperage drain required by the controller or you'll have shut down issues again when you open the throttle up or climb hills since the amperage drain will increase. It's conceivable that this battery is under-powered, in terms of amperage ratings, especially since it appears that the BMS is shutting the system down when the controller is calling for more amperage. If you don't want to pay for a new LIFEPO4 battery right now (they are expensive), you could consider alternatives, including NiCADs. Good luck.