First Time Battery Build Can Someone Help out?

Sunsetsolar · Nov 4, 2022

I have a kit from Seplos and they sent me the battery config its suppose to be 4s2p but if I load the batteries as in step six then place the bus-bars as in step seven I think I will have a big bang! And in step seven I see that the serial bar codes do not line up as the way the step six shows the batteries installed..

Can anyone take a look before I smoke this..
I called the vendor for tech support but No reply so I thought I might pass it by you guys...

This is a first time post so if its in the wrong format or location let me know and delete it and i'll try to set it up right..
Thanks!

BentleyJ · Nov 4, 2022

You have a good eye, nice catch. You are correct, the assembly instructions are dangerously incorrect the cell orientation in the first case appears to be perhaps an 8S configuration while the bus bars are designed for the 4S2P configuration.
Are the bus bars in the kit exactly as shown in the pic?

Sunsetsolar · Nov 4, 2022

yes the bus-bars are exactly the same looks like the battery will eat itself with the first step install!

Sunsetsolar · Nov 4, 2022

Also in the 7th step if you look at the serial identifier codes they are mismatched from that of step 6..doh.

BentleyJ · Nov 4, 2022

Sunsetsolar said:
yes the bus-bars are exactly the same

Based on the color of the terminal insulators that are visible under bus bar LM-2, Brown on left & Black on right, are you comfortable assembling the battery in the proper 4S2P configuration working out from LM-2 and logically identifying the other cells orientation from that location?

Sunsetsolar · Nov 4, 2022

That was my plan as I can see the orientation...
I will post a picture when done but I am waiting on eva foam they forgot to send but after I get that i will populate and post a picture for the forum to see and give me a blessing

Hopefully!

Sunsetsolar · Nov 4, 2022

I will also upload a diagram of my thinking but need a little bit of time to set that up...

Sunsetsolar · Nov 4, 2022

8 cells total
four sets of two 3.2v cells (in parallel)
those are then placed in series to give 12.8v
See attached picture...

BentleyJ · Nov 4, 2022

Yes, that looks good. It always drives me crazy how the positive terminal on the cell is Black, I usually stick a small piece of red electrical phase tape next to the positive terminals on all the cells when I'm working with them just so I don't make a mistake if distracted or having an off day. The funny thing is most of the BMS and active cell balancing products from China do conform to the traditional Red wire is Pos & Black wire is Neg convention.

Sunsetsolar · Nov 4, 2022

I know that's why I go slow because there is a lot of energy involved here it can melt a wrench....
I am just frustrated with their idea of tech support three requests and the same document sent all three times..
Ahh well I think I have got it just paranoid loll!

Sunsetsolar · Nov 13, 2022

Final update...Got it working my diagram was correct but I could not get the BMS to turn on by pressing the on switch..
(Zero volts on output terminal)
What i found is you need the unit turned on and use a power supply to inject a charging current and that boots the BMS for the first time ...
After that it works great!

First Time Battery Build Can Someone Help out?

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