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Pat911 · 09-18-2021, 05:50 PM

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.

09-18-2021, 05:50 PM	#4
Pat911 Gone Wild Join Date: Dec 2020 Location: Melbourne, Australia Posts: 1,939	Re: 36V 2007 TXT converting to Lithium 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.