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Pack bus bar gauge
#1
I keep seeing three strands of 2,5mm2 turned in one bus bar. If i count this means 7,5mm2 per pack.

Can this stand the big amperages?

This is probably a stupid question but i have always been wondering about this
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#2
Please take a look at the charts found here: https://secondlifestorage.com/t-What-siz...ould-I-use
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#3
https://secondlifestorage.com/imghost/qtqzit0.jpg

Great work, but for us "the metric basterds" in mm2 or mm in dia would be nice.

For example i use a busbar 8 times a 2,5mm wire, eg 2,05mm2 wire,(8,4mm2) that would be 5 ga.
If you use 6 of those strands u sit on 6.5 g.
If  you use 3 of those strands (1x!) u have 6.15mm2 eg, then u are between 9 and 10 awg.
https://www.rapidtables.com/calc/wire/wi...chart.html

But beware of mm2 surface and diameter = mm

Hope this helps


 

If i made a calculation mistake, or unit confusion, please correct me.
Still learning English. Learning Li ion and solar technology.

2800 cells in packs Exclamation above 2500mah and 90%soh.
~400 cells between 1800-2500 and above 90%soh(sell?)
600 cells between 2200 - 3000mah, 80-90%soh (sell?)
3000 waiting for testing.
approx: 0 cells not safe for use: dead, heaters, to high ir or sd/vamps

Time is our enemy, must work to, the sun is our friend, must relax to.
With best regards
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#4
Yes it does ! sorry for the perhaps obvious questions. But I always think that asking questions is a good thing !
Korishan likes this post
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#5
In domestic household (read Denmark/Europe) a 1.5 mm2 single core will be OK to fuse with 13 A (Common Installation cables are 3 x 1.5, Live, Neutral, Earth). Need more power, next step is 3 phase AC, Cables used for domestic use is 5 x 2.5 sq mm, these are fused with 16/20 Amps.

So using 3 x 2.5 sq mm strands should be OK for 50 A, deducted a bit for twisting the 3 strands.

Personally I use 4 x 2.5 mm2 or when the thick wire runs out, 7 x 1.5 mm2.

Each side of a cell bank has 2 bars, so 100 Amps should be safe.

I rate each bank at 80 A (fused) and each cell (100 ea) is fused with 1 A.

ChrisD
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#6
@ ChrisD
Denmark is not even so far away, but here in Holland the common household wire is 2.05 sq mm with 16 amp fuses, ac
Live neutral and earth.
For installation or machinery its also 2.05 sq mm but times four or five wires, 3 times live, 1 or no neutral and 1 earth. 25 amp fuses ac.
Still learning English. Learning Li ion and solar technology.

2800 cells in packs Exclamation above 2500mah and 90%soh.
~400 cells between 1800-2500 and above 90%soh(sell?)
600 cells between 2200 - 3000mah, 80-90%soh (sell?)
3000 waiting for testing.
approx: 0 cells not safe for use: dead, heaters, to high ir or sd/vamps

Time is our enemy, must work to, the sun is our friend, must relax to.
With best regards
Reply
#7
(08-03-2019, 01:55 PM)100kwh-hunter Wrote: Great work, but for us "the metric basterds" in mm2 or mm in dia would be nice.

If you look at the post, there is an image that gives a size comparison. It was included for this exact reason so that imperial and metric measurements could be easily compared/used.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
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#8
(08-03-2019, 02:52 PM)Ivo Staelens Wrote: Yes it does ! sorry for the perhaps obvious questions. But I always think that asking questions is a good thing !

Yes, asking is always a good thing. That's why I post the link to the FAQ that answers most basic questions Wink
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
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#9
@ Korishan, yep, found it, it was right next to where i put my glasses.
To bad it ends at 10ga.
Thanks
Still learning English. Learning Li ion and solar technology.

2800 cells in packs Exclamation above 2500mah and 90%soh.
~400 cells between 1800-2500 and above 90%soh(sell?)
600 cells between 2200 - 3000mah, 80-90%soh (sell?)
3000 waiting for testing.
approx: 0 cells not safe for use: dead, heaters, to high ir or sd/vamps

Time is our enemy, must work to, the sun is our friend, must relax to.
With best regards
Reply
#10
(08-04-2019, 11:33 AM)100kwh-hunter Wrote: @ Korishan, yep, found it, it was right next to where i put my glasses.
To bad it ends at 10ga.
Thanks

Good point. I've updated the images and added this one:
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
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