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Jason's power wall
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)

I'm thinking about using the bms and solar charger from Its only $220 us which is a cheaper alternative to the batrium. The SMBS40 can handle 4 60 cell solar panels.
Stefaan De Ridder, Korishan, owitte And 1 others like this post

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(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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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: 5140 (overall: 9974 Ah, average: 1940 mAh)
Cells in production: 2940 (overall: 6174 Ah, average: 2100 mAh)
Wall bank: 7s320p, 672 Ah, 16 kWh
Box bank: 7s100p, 210 Ah, 5 kWh
Project page
Live solar/powerwall values
Daily graph
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.

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.

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
Do you guys think this bus bar would be sufficient? Its 3 strands of 14 gauge.
what is your anticipated Amp draw from these packs? That will determine if the bus bars are ok
Picture of bus bar

Well, I am not sure, however it is a small project so maybe somewhere around 1000w.

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Here is a good chart.

3 14 is effectively 9 guage
DK100 likes this post
Thanks. Do you think 9 guage is good enough?

I could do 4 14 gauge

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