sunnyday

I emailed ping battery....asking him if 2.1 LVC for each cell is safe and advisable. heres his response :

The low voltage cut off is cell based. When any cell voltage reaches 2.1v, the BMS will cut off the power.



Voltage of LiFePO4 drops very rapidly when reaching 2.5v when it’s being discharged. So, you can also look it as 2.5v. So, the total will be around 2.5x16=40v. You cannot look it as 2.1x16, because when one cell is 2.1v, the rest cells could still have 2.5v or higher voltage. If all the cells can reach 2.1v at the same time, we wouldn’t need the BMS.



Actually it’s hard to see 2.1v or 2.5v at the moment of cut off, because voltage will rise back to be close to its nominal voltage as soon as the discharge is stopped.



You just need to set the low voltage cut-off of the controller to be around 40v.



33.6v is just ideal on the condition that all the cells are 100% matched and 100% balanced. It’s impossible.



Best regards,



Ping

So according to him...40 volt LVC....is proper....not 33.6 or 46 or 45....

this is for a 48 volt lifepo4.