New build some advise please

[crocodillis]

Hi all newb to the forum this is my first time venturing into building my own pack so am looking for a little guidance I am building a 12volt 400Ah battery pack with the following 8 x 200Ah 3.2 volt RJ Lithium prismatic cells and a 200 amp BMS also supplied by RJ Lithium.
So my limited understanding is 4 x 3.2 V 200amp cells in series = 12.8 volts done 2 times, then parallel both batteries to give me 400Ah at 12 volts have I got this right?

So my questions are how do I do the above using 1 BMS and where would I be likely find a diagram for the above.
I'm aware that I have to top balance the cells before I do anything else.
Any help would be much appreciated.

 

[JoseAgustinV]

Hi all newb to the forum this is my first time venturing into building my own pack so am looking for a little guidance I am building a 12volt 400Ah battery pack with the following 8 x 200Ah 3.2 volt RJ Lithium prismatic cells and a 200 amp BMS also supplied by RJ Lithium.
So my limited understanding is 4 x 3.2 V 200amp cells in series = 12.8 volts done 2 times, then parallel both batteries to give me 400Ah at 12 volts have I got this right?

Yes, that is the correct connection to get a 12V battery with 8 cells, but you will need 2 BMS for it, one 4S for every 4 cells connected in series

 

[crocodillis]

Thanks Jose good to know I am on the right track

 

[Craig]

You can do 1 BMS if you put 2p4s out 2 cells in parallel them 4 if these sets in series. Will only need 1 BMS

 

[crocodillis]

Oh hell now I'm confused Lol