₦airaland Forum

BigDickProblems:
This is one of the best threads on Nairaland that I’ve seen. But I couldn’t find any post here that shows a step-by-step explanations on how to build a pack. It’s as though everyone here already knows how to connect your batteries in the right configurations, how to choose the right BMS for your pack and connect your battery terminals to a BMS, and how to create terminals for charging the battery. That would have cemented the whole knowledge.

dollarnaira:
Probably you didn't read from page 1.

BigDickProblems:
I did, but it was only pictures, and no explanations. I for instance have issues understanding the battery configurations and how to tell what type of BMS will work for the configurations you use(e.g When they say 4S2P). I understand perfectly what a parallel and series connection is from my Physics textbook, however, I have no idea about it when it comes to arranging multiple cells like you guys do.

I only think of it from one perspective (the way we were taught in Physics class), and this is where my problem is. Even if I come with an open mind it still confuses me.

For instance, I know how to explain to you that a 128Wh system using a 3.2V 5Ah batteries can be built this way (attached image). You can see that my batteries are arranged in series in two sections to get the 12.8V (I.e 3.2V *4) and keep 5AH the same for each cells. Then the two sections are now joined in parallel to keep the 12.8V and increase the AH ( I.e 5Ah * 2).

So this is my problem—it is the only perspective I see it from. But you guys arrange all these cells as a bundle and create connections that I can’t just understand no matter how hard I try. To make it worse I start hearing 4S2P, like how 🥲?)

BigDickProblems:
I did, but it was only pictures, and no explanations. I for instance have issues understanding the battery configurations and how to tell what type of BMS will work for the configurations you use(e.g When they say 4S2P). I understand perfectly what a parallel and series connection is from my Physics textbook, however, I have no idea about it when it comes to arranging multiple cells like you guys do.

I only think of it from one perspective (the way we were taught in Physics class), and this is where my problem is. Even if I come with an open mind it still confuses me.

For instance, I know how to explain to you that a 128Wh system using a 3.2V 5Ah batteries can be built this way (attached image). You can see that my batteries are arranged in series in two sections to get the 12.8V (I.e 3.2V *4) and keep 5AH the same for each cells. Then the two sections are now joined in parallel to keep the 12.8V and increase the AH to 10AH( I.e 5Ah * 2).

So this is my problem—it is the only perspective I see it from. But you guys arrange all these cells as a bundle and create connections that I can’t just understand no matter how hard I try. To make it worse I start hearing 4S2P, like how 🥲?)

iraybuju:
If you still don’t understand let me know!!

dollarnaira:
We combine the cells first, then series.
From the above scenerio, we do 5+5 = 10a den series i.e 2p4s. It workes far better than the above. Just imagine 40 cells of 5a, do combine 10 cells together first i.e 10p (50a) in 4 different places, then series them i.e 4s.

In total you will get 10p4s solid piece instead of 4s10p.

Fapemz:
We always deliver on our promise. We have been around for over 10years already

BigDickProblems:
Pls I am still confused o 🥲
Infact I had to loosen my discarded laptop battery to make sense of the whole thing, then boom, the laptop own is understandable to an extent, infact I just used today trying to understand the ones you guys run here and I still don’t get it. Trying to unlearn something is difficult I guess.

I understand the mathematics around it, but I don’t understand why some connections need to be done at different joints and all that; the way you guys do yours.

BigDickProblems:
Only if a diagram can come in, but I know it’s not possible due to the third Dimension.

Fapemz:
We always deliver on our promise. We have been around for over 10years already

dollarnaira:
See this
24p3s

24 cells welled together in group of 3
Then series them positive to negative, positive to negative.

officialfestus:
852w?

dollarnaira:
See this
24p3s

24 cells welled together in group of 3
Then series them positive to negative, positive to negative.

BigDickProblems:
Boss Wow!

This just opened my eyes 😂
I understand now. Wow!

Please how can I get these cells and how much are each of them for a 12.8V system?

dollarnaira:
Roughly but will do capacity test today.

dollarnaira:
These are lithium ion 3.7v per cell
Series will give 11.1v ( 3 cells )

Full charge is 4.2v per cell
Series = 12.6v ( still 12v system)

Lifepo4 is 3.2v per cell
Series 12.8v ( 4 cells )

Full charge is 3.50v per cell

Series 14.0v ( 12v system ).

Lithium ion 16v = 4s
Lithium ion 24v = 7s ( 7 cells )

dollarnaira:
See this
24p3s

24 cells welled together in group of 3
Then series them positive to negative, positive to negative.

BigDickProblems:
But on a closer look at the first image, why do you have 4 wires extended out from each of the 24p sets?

Cos I would expect just 2 wires (positive and negative extending out from your 24 parallel cells. Is there any reason for that?


Edited: ok i understand now, It doesn’t matter, so far all the negatives and positives from each 24P meets with the negatives and positives respectively on the other 24P sets right ?

dollarnaira:
Yes.
Top is positive
Bottom is negative

More cables, the better especially if your intention is to to heavy load.

The above powered a 100L freezer without stress.

dollarnaira:
Yes.
Top is positive
Bottom is negative

More cables, the better especially if your intention is to to heavy load.

The above powered a 100L freezer without stress.

barezy:
Boss please kindly tell me how to get this 18650
I want to build some stuff with it
please abeg you bro

BigDickProblems:
Damn!

How much did it cost you to build? And what’s the capacity in WH?

dollarnaira:
Testing at the moment

barezy:
Boss please kindly tell me how to get this 18650
I want to build some stuff with it
please abeg you bro

dollarnaira:
Testing at the moment

Machiny:
why didn't you go for 24v since you have enough cells?

Machiny:
why didn't you go for 24v since you have enough cells?

dollarnaira:
Just 72 cells
10p7s = 70 cells.

Machiny:
should give same power as the 12v I guess? because from your 12v pack there is total of 72cells,