Beginners Guide to Processing 18650 Cells | Cell Database



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Sonic's Powerwall (London, UK)
#11
(10-13-2017, 12:33 PM)cristof Wrote: Hello,
for my 80P pack (4 x 20) I use 3 wire 2,5mm2 and I twist them with drill machine (hand electric toll)
It's give 7,5mm2. You can go up to 5A per mm2. 7,5mm2 can go up to 38A.
As there is two Twisted bus going to the lugs it's give around 75A.
Appologize for my English


... from France....

Thanks cristof, perfect. This is exactly what I will do.

(10-13-2017, 01:30 PM)mormor1971 Wrote:
(10-13-2017, 10:54 AM)Sonic01 Wrote: So you're looking to properly tie yours into the mains then? I'm just going to daisy mine off an AC outlet in my shed. I'm not actually touching my house at all. Not for the moment anyway...

That was the general idea yes. But if I ever get that far is the big question!

I don't have a shed yet but are toying with the idea of building one in my back garden at some point and if that happens then it would go off-grid or grid-tied. I've got a few crazy ideas for what else I could put in there! Tongue

I didn't want to have to deal with all the insurance crap + paying an electrician to wire it in + working out the deal with the power company to feed back into the grid.

Let us know how things progress Smile
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#12
progress at last Big Grin cell testing is finished, my 7s40p is ready to be wired up! Big Grin got 5A fuse wire and some buss bar cable, just need some time to do it Smile

I started wiring up my first pack but im having trouble getting my fuse wire and negative connections soldered to the bus bar? the bar gets super hot but the solder jjust doesnt seem to fuse to it? I'm using 4x2.5mm cables wound together.

[Image: IMG_20180128_123023.jpg]
[Image: IMG_20180128_123037.jpg]
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#13
Man, that was sonic fast Tongue

Is the solder actually flowing, just not sticking to the copper wire? If so, you probably need to apply a little flux to the copper. If not, you need a heavier duty iron. The problem is the copper could be pulling the heat away faster than the iron can produce it, so it's not sticking properly.
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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#14
(01-29-2018, 01:00 PM)Korishan Wrote: Man, that was sonic fast  Tongue

Is the solder actually flowing, just not sticking to the copper wire? If so, you probably need to apply a little flux to the copper. If not, you need a heavier duty iron. The problem is the copper could be pulling the heat away faster than the iron can produce it, so it's not sticking properly.

no its not, it doesnt really seem to bond properly, it just blobs on the surface and doesnt stick well. as you say, they copper bar really heats up and it spreads fast.

I'll try with a little flux, im using a gas iron which is rated at 120W.

I tried to find something more powerful but didnt have any luck :/
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#15
120W should be sufficient. I'd guess the copper is just too oxidized to allow the solder to bond, and if there is any flux in the solder, it's not enough to clean. You could also use a small brass bristle brush on the copper to shine it up before soldering to it.
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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