Capacity

[Gregory105]

Newb question. I have built 6 batteries each with its own BMS. They are EVE style cells 280ah. My question is what size ah bank do I have? I have 8 cells in a 4s configuration all 12v. 48 cells total 6 batteries in parallel. For some reason I feel I am not looking at the math correctly.

 

[hwy17]

I think it's 48 / 4 = 12 x 280 = 3360ah

 

[Supervstech]

Should be 6x280x12 = 20,160Wh or 6x280 =1,680Ah
Or 48x280= 13,440Ah@3.2V x3.2 should equal 43,008 average Wh

 

[Gregory105]

I think it's 48 / 4 = 12 x 280 = 3360ah

Thats what I’ve been coming up with.

 

[Supervstech]

Hmm... the numbers dont jibe... ive made a mistake here somewhere.

 

[Supervstech]

48 cells in a 2p4s config make 6 batteries... i see now.
Double my original figures, and the 3.2V figures are correct, divide by 13.8 to get 12V Ah

 

[Supervstech]

Should be 6x280x12 = 20,160Wh or 6x280 =1,680Ah
Or 48x280= 13,440Ah@3.2V x3.2 should equal 43,008 average Wh

So, 43008/13.8 = 3,116.5217391304Ah

 

[Supervstech]

You could also take the 280x2 to get each Ah series, multiply x 6 to get the total.
560 ah each 2s4p then times 6 for the average total or, the original 3360Ah...

I went too far in the weeds...

 

[Gregory105]

Appreciate the help. So I was doing the math correctly. Just needed to make sure.

 

[BjornM]

You could also take the 280x2 to get each Ah series, multiply x 6 to get the total.
560 ah each 2s4p then times 6 for the average total or, the original 3360Ah...

I went too far in the weeds...

Yea the OP description was a bit hard to understand. But from the pictures it is a 2p4s config giving 12 V 560 Ah per pack. Six of those packs in parallel giving a total of 12 V 3360 Ah.

 

[Gregory105]

Thats what I was curious to the total ah. I thought my math was wrong. But I was figuring it correctly.