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cell level fuses in series?
#1
Hi Folks,

The debate in my mind has started on the configuration of 18650 solar storage packs.

14s10p (14 long x 10 wide) looks to me like a compact, manageable, and modular. Easy to handle and fits nice on a shelf.

This raises confusion as to how to do cell level fuses. I picture fusing in series but the idea seems wrong somehow.

Your thoughts?
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#2
You don't need to fuse in series. That is, I'm guessing you mean fuse between pack 1 and pack 2, between pack 2 and pack 3, etc, etc. This is not needed.
If you do cell level fusing, then you only need to fuse between cell and the bus bar of that pack. Bus bar is connected to bus bar next in the series.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
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Certified 18650 Cell Reclamation Technician
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#3
Thanks for responding Korishan.

I'm failing at putting my thoughts in print...  I think fusing in series was an improper thought/title. think think think.
I have learned from reading this forum that cell level fusing is a wise thing to do. Otherwise I would have hard wired it and called it good.

a) let's say a 14s10p consisting of 14 packs of 10s with the parallel packs being 2 rows of 5 cells.
  
++--++--++--++--++--++--++--
++--++--++--++--++--++--++--
++--++--++--++--++--++--++--
++--++--++--++--++--++--++--
++--++--++--++--++--++--++--
  
If we just look at the top side, the bus bar goes between the two rows of each parallel pack with the fuses crossing the bus connecting each cell. (respectively) This one is long and sexy like a super models legs. I understand this circuit.



b) The illustration below depicts a 14s10p that is actually 14 long x 10 wide. This is what I am looking for. The shape suits me and existing shelving nicely. 

+ - + - + - + - + - + - + -
+ - + - + - + - + - + - + -
+ - + - + - + - + - + - + -
+ - + - + - + - + - + - + -
+ - + - + - + - + - + - + -
+ - + - + - + - + - + - + -
+ - + - + - + - + - + - + -
+ - + - + - + - + - + - + -
+ - + - + - + - + - + - + -
+ - + - + - + - + - + - + -

Correct me if I'm wrong... Build the series strings and fuse each to a bus at their polar ends.
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#4
If I understand what you are saying, you will not be able to connect balance hardware that way. You need to connect each parallel group to the balancing device.

So fusing really has to be done on a per cell basis.
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#5
https://www.youtube.com/watch?v=8Xv8B93EoH0
a 14s11p pack with a little thought you can make one 14s10p that is fused properly and will fit you and your shelves.
the video is one by Daromer (DIY Tech & Repairs on YT)
later floyd
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#6
Thx Geek. The 'B' pack has been nagging at me. Besides no cell level fusing it may very well be the thought of balancing in the back of my head.

I think I got it. Cut that 'A' pack in two and fold it in half. Cell level fusing. Yes. Balancing. Yes. Pos and Neg poles on same side. Yes.

++ - - ++ - - ++ - - ++
++ - - ++ - - ++ - - ++
++ - - ++ - - ++ - - ++
++ - - ++ - - ++ - - ++
++ - - ++ - - ++ - - ++
 - - ++ - - ++ - - ++ - -
 - - ++ - - ++ - - ++ - -
 - - ++ - - ++ - - ++ - -
 - - ++ - - ++ - - ++ - -
 - - ++ - - ++ - - ++ - -

Thx Floyd. I will check that out.
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