I will install my grade A + cells in a Seplos Bms 2.0 box is that if I invest in a Neey 4A active balance box I can do without a top balance it will prevent me from buying a laboratory power supply
So..
Let me make sense of this
You have 16 new grade a cells
You have a seplos Mason 280 diy kit for the cells
You have a neey 4a active balancer
You want to know if you need to top balance your cells before putting them in the mason, and if you can use the neey to perform the balancing for you
No. You do not need to top balance first and the neey will get your cells in balance for you
This is what I have been doing
Few tips :
1 do your initial charge based of voltage, choose a charging voltage of 56v
2 disable the passive balancing switch in the BMS
2 set your neey to the correct voltages
Start 3.45
Stop 3.40
Diff 2 mv
3 charge to 56v and keep your battery there for 5-6 hours ( or untill the balancer is done)
4 after all you cells are balanced change charging voltage to 56.8. be patient, if your pack reaches 56.8 and stays there for 30 minutes, your SOC will reset too 100%
5 discharge untill the BMS shutsdown discharging , your BMS in now trained
6 charge, still using voltage using 56.8 v until 50%, enable communication in the inverter
7 Change total-pack-overvoltage-protect to 56.8
8 enable passive balancer
9 disable neey
10 enable communications
You are good to go !