Drokz`s Powerwall

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Drokz

Member
Joined
Jan 17, 2018
Messages
33
Hi everybody!

this summer i collected several boxes of laptop batteries, now its finaly done with cracking an testing.... :D

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So now iam waiting for parts ....
meanwhile i found a very good deal :D :D froma guy who wanted to sell 13 packs of 80 p. These he had created for its outdoor lighting to do work.
so the packs are not mistreaded.... they are 127amp/pack

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the planning is that i will they set to 7S and 2P (one more will make te 14)
And the cells that i tested wil make the 3de P
So at the end will it 7S3P

Greetz from Belgium
Drokz
 
For celldiers, if you want them to charge properly, they need to be in a line ;)
 
Looks great bud
 
Little update,

I have done my first pack, not reallysatisfied
Time is the problem.....


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Looks pretty good overall. I know how the time thing gets in the way.

One thing you might want to adjust is either the length of time the solder is on the cells, or get a bigger iron. If solder balls, it's not a solid contact. Most of the solder on those cells are balls, and not a blob. There shouldn't be any curves going "under" the solder, it should be more flattened.
 
little update...

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still doing bleedingtests with the packs , 10 done, 11 to go...


iam searching an long time fore the beste setup parrallelconnection...
@photo 2, thatsthe frame i make for it.

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anyone good ideas please?
 
I was thinking about the same setup as you have.
If i was you, if i...., i would not change it, and keep it this way.
Only to connect everything in the front, is going to be a small hassle, maybe that German powerwall guy, with his copper tubes.
Thats very appealing to me

found his name: owitte, one post back
 
With that much space in the middle you Will get sag in the packs that eventually can break the busbars. I suggest a proper shelf :)
 
Hi all,


after a while, i did something again :p
searching for parralel wiring..
I wonder how many amps they could handle.....
6cm X 2Cm X 1mm

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Thanx for the link !
But these are just 2 sizes, Length, width, thickness?
Inches are new to me: P
 
It was a Star Wars joke ;)
 
@Drokz

Lengthis reallynot the deciding factor here as a particularsize of a copper "wires" ampacityis not affected by it.
Now if you are talkin 20 meters then yes but that is another measurement as in voltage drop because of resistance.

So a copper bar with a measurement of1/16 of an inch thickness and1/2 an inch ofwidth will carry 100 to 149 Amps
1/16 of an inch = 0.0625 of an inch 0.0625" 25.4= 1.5875mm
1/2 of an inch = 0.5 of an inch 0.5" 25.4 = 12.7mm

So a1.5875mm thick by 12.7mm wide copper bar would carry 100 Amps safely.

You have a6cm X 2Cm X 1mm bar. I don't care about the length 6 cm 1 mm thick by 20mm (2Cm) width.

So 1.5875 X 12.7 = 20.16 and 1 X 20 = 20 so I would safely say your bar is capable of carrying 100 Amps.

Would you like me to take a math and conversion test for you? :p

Wolf
 
Drokz said:
1/16 = 25.4/16 = 1.5875mm ???

so 2Strips are good enough for 100amps
Click to expand...

See above. I added some more info.

But yes your single strip of 1mm by 20mm is good for 100A
If you double them they would be good for 200A

Think of it as if you were flattening a round copper wire the flatter the wire gets the wider it becomes.
Wire size for 100 Amps is 26.7 mm or AWG 3

Wolf
 
@Wolf

Thanks man !!!!! now its clear !!!! :D

its one of the 3 parallel connections. so 3 to the negative en 3 to the positive .... with 8 or 10awg wire.
 
Square mm (metric) works best, sooner imperial measurements die the better!

Basically, as said above, you work out the ampacity (current carrying) ability of a bus bar or cable by its cross sectional area and environment it's in.
Yours is ~24mm x 1mm = 24sqmm cross section, assume open air.

Here's a table of values for bus bars:
https://www.australwright.com.au/technical-data/advice/copper-busbar-rating/

For cables, The "Olex Handbook" is considered a reference for all things cable down here in Australia (Google for it).
Includes "in-conduit" & cable bundle ratings, different insulation types, etc
 
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