Quote:
Originally Posted by Pat911
Hi Richmond,
I’m assuming a LiFePO4 battery. 36v is 3.0v per cell for a 36v LiFePO4 battery. Your BMS is cutting off at this point to protect the cells. At 3v, a LiFePO4 cell only has about 5% capacity left. It’s doing what it’s supposed to do.
What voltage are you charging to? It should be 42.6v to 43.8v and I would hope you’re using a lithium charger, not the original lead acid charger.
Lastly, when you upgraded the BMS, did you use one specific to LiFePO4 or a programable one that you set parameters in? If programable, did you use values specific for LiFePO4? It may have NMC parameters in there, which would be very bad for charging.
Cheers
Pat.
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Hi Pat,
Thanks for replying.
The full charges for the cell is around 42.x V, and yes, i am using lithium battery charger.
When the BMS cut off the current supply, it still having more than 50% of the capacity in the battery which is what the supplier told me and he told me that voltage shd cut off at 28V.
I cant program the BMS. My supplier just asked me to upgrade the BMS when the cut off happen, after I upgrade, the result is the same.
Regards,
Richmond