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Old 11-13-2022, 12:31 AM   #17
Pat911
Gone Wild
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Join Date: Dec 2020
Location: Melbourne, Australia
Posts: 1,919
Default Re: Big Battery Eagle Kit

A BMS is not a charge controller. 3.65v is correct for a protection device, which is what a BMS is. There is no reason to charge a LiFePO4 cell above 3.5-3.55v.

Remember, when charging one cell will always be the highest, they will never be equal. If you have your BMS protection voltage set to the same max voltage that you’re charging to then the BMS will terminate charging early, as soon as that one cell hits the high voltage cut off. You will most likely miss the saturation stage of charging as it will go from bulk to off. You want the charger to control charging, not the BMS. With the BMS high voltage set higher than the charge voltage, charging will continue and that one higher cell will be brought down by your balancer.

Hope that explains it but if it’s still unclear just say so and I’ll try to explain differently.

Edit: BTW, it’s the saturation phase that will allow you to fully charge lithium with a lower than max voltage, so you don’t want to miss out on that. And, a good charger will allow you to set its constant voltage setting.

Cheers
Pat.
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