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Jason's power wall
#1
Started assembling the packs for my power wall. The power wall will be 7s40p. I am using new 2200mah Samsung cells I bought for 80 cents each.
Each pack is 1s20p (Owitte style)


Update:
I'm thinking about using the bms and solar charger from http://electrodacus.com/. Its only $220 us which is a cheaper alternative to the batrium. The SMBS40 can handle 4 60 cell solar panels.
jdeadman, owitte, Stefaan De Ridder And 1 others like this post
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#2
(02-07-2018, 02:49 AM)Jason Morris Wrote: I am using new 2200mah Samsung cells I bought for 80 cents each.

How'd you pull that off? Or was it one of those super special deals cuz a store was trying to get rid of them real quick?

Nice color scheme ya got goin there Wink You gonna try to keep that throughout the build?
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#3
nice design and coloring Smile . I'm also interested in your cell source, 80 cents for 2200mAh is quite cheap - as long as there's no "fire" in the brand name Big Grin .

Cells tested: 6.721 (overall cap.: 13.587 Ah, average cap.: 2.021 mAh)
Cells in production: 3.500 (overall cap.: 7.350 Ah, average cap.: 2.100 mAh)
Powerwall setup: 7s500p, 1.050 Ah, 27 kWh
Project page
Live solar/powerwall values
Daily graph
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#4
I  bought some a while back and they are decent cells.  You might have to heat shrink a bunch since they are old new stock and connected.






Idea KEEP THINKING Idea
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#5
While the batteries aren't 100% "new" they are all testing at 2350+ on my opus. They were used in a medical device that was recalled and the batteries were removed.(very little used if any) I contacted seller and bought in bulk which reduced price due to shipping. http://r.ebay.com/Qz5eNc

I going to make some blue and green packs as pictured above and pink and green and maybe some pink and blue
Korishan likes this post
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#6
Do you guys think this bus bar would be sufficient? Its 3 strands of 14 gauge.
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#7
what is your anticipated Amp draw from these packs? That will determine if the bus bars are ok
******Hi My name is Jason and I have SOCD (Solar Obsessive Compulsive Disorder)*******
Current Powerwall - 1400 Cells 7s200p (modular 40p packs) ~ 12kWh of storage     4x 315W Canadian Solar Panels

Working on the next 7s40p packs     ~2.5kWh

Waiting on 2000 Cells of unused Sony vt4 (2000mah 30A) ~ 15kWh      hehehehehe  More Power
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#8
Picture of bus bar

Well, I am not sure, however it is a small project so maybe somewhere around 1000w.
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#9
Here is a good chart.

3 14 is effectively 9 guage

https://www.wirebarn.com/combined-wire-g...ep_42.html
DK100 likes this post
******Hi My name is Jason and I have SOCD (Solar Obsessive Compulsive Disorder)*******
Current Powerwall - 1400 Cells 7s200p (modular 40p packs) ~ 12kWh of storage     4x 315W Canadian Solar Panels

Working on the next 7s40p packs     ~2.5kWh

Waiting on 2000 Cells of unused Sony vt4 (2000mah 30A) ~ 15kWh      hehehehehe  More Power
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#10
Thanks. Do you think 9 guage is good enough?

I could do 4 14 gauge
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