I am running a 12s4p 18650 pack. I am charging with a voltage protector and I don’t let it charge past 49.9 volts.
When I start charging the battery meter rises at a steady pace, maybe 1% every few minutes. But when the meter hits my max set voltage, and usually right around 90%, the chatging slows wayyyy down. Like 1% every 20-30 minutes.
Is this because I have the voltage protector set at 49.9v?
Should I just consider the board fully charged at 90% or should I just be waiting an extra 3-4 hours for that last 10%? I realize that’s a subjective question but I guess I wanna make sure it’s not forcing the batteries to charge beyond 90% if I shouldn’t be, if that makes sense.
My bms for another project doesn’t balance until the very end, so restricting the max voltage meant it wouldnt ever balance the cells, so i had get rid of the voltage limiter and charge to 100% Im not sure how other BMSs behave, maybe the point at which it balances it settable.
I only have experience with one BMS, and it terminates the charge once balancing has complete. If you connect a multimeter inline in current mode you will see what the BMS is doing. I charge my cells with a simple cc/cv pcb. Its set to the maximum voltage of my pack. 4.2 x number of cells.
I wanted to charge to 90% only, but id have lost the BMS balance function. So scrapped that idea.
I’m not sure why the person you bought it from told you this, but it is not correct (unless he meant to say 50.4V and not 50V). You need to charge all the way to 50.4V for the balancing to work on that BMS.