BMS newbie

I am new to this forum and have experiented with small solar systems mainly in my garden.
Until recently I have only used lead acid but now I have switched to LiFePO4 cells with BMS.
I know a bit about the theory being an electrical engineer but I simply can't get my different BMS's to work properly.
I know how to wire it but still gets uneven voltages of the cells when charging. And above 3.65V
I even bought an active balancer just to try.
Greetings from Sweden
/Robert

I don't know it I would be able to assist you with your issue but you're gonna have to share a little more information like your cell chemistry the model of your BMS the inverter you might be hooking it to are you using comms or user mode etc

How "uneven"? Did you balance the cells (charge in parallel) before charging in series? Active or resistor balancing?

If active balance, charge at the voltage where the highest cell reaches 3.55v. Hold that voltage until the high cell drops enough that you can raise the charge voltage by 0.1v. Rinse and repeat until you reach your desired voltage. Then hold the charge voltage until the cells are within your balance target.

On your BMS's app there's usually a setting along the lines of "Balance while Charging", turn that OFF and let it sit a while, that'll let the balancer work when the battery is just chilling out instead of only working when there is charging happening. Usually takes a day or so to balance out unless the cells are WWAAYY out of whack. Throw it on the charger overnight and it should pretty much take care of itself.