Beginners Guide to Processing 18650 Cells | Cell Database


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diMy Powerwall
#31
Some new wraps.. they look good. Got the spacers as well. Time to start on packs![Image: 50e239a57d4cfb4ed6856343e969d15c.jpg]
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#32
Im working on sizing my bus wires.. can you guys help me with the load on each pack? 14s70p, i will probably have a 4kw inverter. What kind of amperage could each pack see?
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#33
On 14s and 4kw. Is it 4kw max? If not you need to calculate base don max current.

14*3.7=51,8

4000/51,8 = 77A

Thats just above 1A per cell. On my pack that is designed per basis MAX 1A per cell and 80A per pack i have 6*2.5mm2 copper wires twisted together. They should easily take the load without any larger loss. Reason for 2.5mm2 is because thats easy to find here for scrap value.

This is how i make them:


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#34
4000W/48V = 83A
83A / 70Cell = 1.186A/cell

I think I got my math right there. If that is correct, I would recommend going up in P size. 100p would make it .83A/Cell, and 120p would be .69A/Cell



Daromer beat me to it. Tongue but we kinda came close to the same amp/cell based on what you gave. 1A/cell is kinda the high end of what you want to pull.
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#35
I have access to a lot of cool stuff. This solid copper wire is #8 which I think is rated for 40amps. It seems too thick to double up but I could try it[Image: 3def221c21f43076059dfd52c32d4561.jpg]
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#36
Wish I had access to kind of wire! Smile
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Dollar Shave Club. Best Razor I've ever used
Certified 18650 Cell Reclamation Technician
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#37
I could up the pack size... would need to buy more cells though. Maybe i'll shoot for 80P
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#38
Or at least make your packs expandable so you can add more in parallel as you get more batches in. That was each time you add a layer of parallel, you drop the A/cell values
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Dollar Shave Club. Best Razor I've ever used
Certified 18650 Cell Reclamation Technician
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#39
My wire guy says this solid copper is good for 95amps. Plus with two runs of it, it should only need to carry half the load.. just need to make sure my bus connection at the end can carry the full load..

Still brain storming design ideas[Image: 2f5db26718478ebceb4e0a8e564b72cc.jpg]
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#40
what happens during discharge if one of the packs is a smaller capacity. For example (not that i plan on doing this) if you had 13s80p and the 14th in the series was only 40p? does that pack pull less amperage than the others so they all fall evenly?
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