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First build
#1
I've been working on this 4s 100p 24v build since last year. Acquiring all the packs doing all the work to get 700 good batteries for the build. Upfront costs have been staggering so far with all the supplies needed and equipment. I am enjoying this build since I'm retired and living off the grid and in the middle of the desert, nearest neighbor 5mi. I plan on building 3 more banks after this one is up and running. Well now the soldering starts, will update soon. Thanks for reading
Ibiza likes this post
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#2
4s is not 24v
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#3
Yes, for a 24V system, you will need a 7s setup.
If it is for a off-grid system, take a look at a 48V system (14s) ... lower DC currents and equipment might be more avialable.

And welcome ...  Smile
___________________________________
18x 300Wp solar off grid and 10x 180Wp solar tracker grid-tie
10KW 3phase hybrid inverter. 40Kwh 18650 storage (for now)
My setup: https://secondlifestorage.com/t-Instant-powerwall
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#4
I guess I didn't word that right. I have 7packs of 4s 100p to equal 24v. 700 batteries.
Thanks
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#5
No you are still saying it wrong. What I think you are saying is you have 4 sets of 7s100p packs. maybe a simple drawing of what you mean might help understand.

4s in 4 cells in series makes 12.8V nominal and 16.8V fully charged. to get 24V nominal you would need 7 cells in series making Max 29.4V but we are still kinda lost on what you mean
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#6
7x 4s100p are 2800 cells, and will give you 14,8V

Do you mean 4 strings(sets) of  7s100p ... ( one string is 7 packs in series, one pack is 100 cells in parallel = 700 cells/string) 
You never gonne get 24v with a 4s  setup.

I might be missing something ...   Tongue
___________________________________
18x 300Wp solar off grid and 10x 180Wp solar tracker grid-tie
10KW 3phase hybrid inverter. 40Kwh 18650 storage (for now)
My setup: https://secondlifestorage.com/t-Instant-powerwall
Reply
#7
I guess I'm still saying it wrong. I do appreciate the help. Hears what I have.

7 packs of 100 7s 24v, how's that?
wim and jdeadman like this post
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#8
Still wrong... 7s100p nothing more...  Wink

It is well explained in the FAQ section.
https://secondlifestorage.com/t-Frequent...stions-FAQ
Korishan likes this post
___________________________________
18x 300Wp solar off grid and 10x 180Wp solar tracker grid-tie
10KW 3phase hybrid inverter. 40Kwh 18650 storage (for now)
My setup: https://secondlifestorage.com/t-Instant-powerwall
Reply
#9
So it is really 7p 100p
Correct?
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#10
(04-06-2018, 08:28 PM)Randolph12950 Wrote: So it is really 7p 100p
Correct?

7s100p
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