Beginners Guide to Processing 18650 Cells | Cell Database


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There's a new wall in Germany!
#71
Now that's a masterpiece
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#72
This is brilliant build. Looks very easy to upgrade and maintain. I'm thinking about following the same type.
Big congratulation @owitte!
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#73
(11-06-2017, 10:40 AM)cmg_george Wrote: This is brilliant build. Looks very easy to upgrade and maintain. I'm thinking about following the same type.
Big congratulation @owitte!

thanks a lot Smile . You're right, it's very easy to upgrade and maintain. I started with 700 cells in 5 rows and upgraded step by step to currently 2240 cells in 16 rows. You can even remove a pack without taking the whole wall out of production and you can check each cell 'personally', i.e. fell the temperature or verify fuse wires are still ok.

Good luck and have sun!
Oliver

Cells tested: 4238 (overall: 8077 Ah, average: 1906 mAh)
Cells in production: 2240 (overall: 4704 Ah, average: 2100 mAh)
Powerwall config: 7s320p, 672 Ah, 16 kWh
What's left: my current grid consumption

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#74
Sorry if i missed the this part... but can you please tell me the wall size (the actuall wall). I'm really thinking about going with my build the same way...however i dont think i have the space Big Grin
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#75
(11-07-2017, 09:46 AM)cmg_george Wrote: Sorry if i missed the this part... but can you please tell me the wall size (the actuall wall). I'm really thinking about going with my build the same way...however i dont think i have the space Big Grin

wall size is approx. 1,80m x 2,20m (height x width)

Cells tested: 4238 (overall: 8077 Ah, average: 1906 mAh)
Cells in production: 2240 (overall: 4704 Ah, average: 2100 mAh)
Powerwall config: 7s320p, 672 Ah, 16 kWh
What's left: my current grid consumption

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#76
Since you have used cells with varying capacity, do you aim for a certain Ah for each pack? If so, what is it?

EDIT: found the answer a few pages back:

Quote:yes, all my packs have equal capacity. I group them all to 42Ah (average 2100mAh per cell in a pack of 20). This way, a 7s row has almost exactly 1kWh (42Ah * 24V = 1008Wh). I don't care about the capacity of a single cell, as long as all 20 cells in a pack add up to 42Ah. Therefore, the range in a pack can be everything between 1700 (lowest capacity I'm using) and 3000mAh.
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#77
(Yesterday, 01:10 PM)zag2me Wrote: Since you have used cells with varying capacity, do you aim for a certain Ah for each pack? If so, what is it?

EDIT: found the answer a few pages back:

Quote:yes, all my packs have equal capacity. I group them all to 42Ah (average 2100mAh per cell in a pack of 20). This way, a 7s row has almost exactly 1kWh (42Ah * 24V = 1008Wh). I don't care about the capacity of a single cell, as long as all 20 cells in a pack add up to 42Ah. Therefore, the range in a pack can be everything between 1700 (lowest capacity I'm using) and 3000mAh.

OK. nothing more to say Big Grin

Cells tested: 4238 (overall: 8077 Ah, average: 1906 mAh)
Cells in production: 2240 (overall: 4704 Ah, average: 2100 mAh)
Powerwall config: 7s320p, 672 Ah, 16 kWh
What's left: my current grid consumption

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#78
Where did you find so many cells in Europe.o It seem a stumbling block for us EUers
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