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Mistake busbars ?
#1
Hi all,

Did i made a (big) mistake in the design of the busbars in my setup ? Huh
A few members made a correct observation in my build thread, so just a bit unsure
I know the general idea of the busbars on the packs is to do the terminals of the positive side oposit to the negative side. This to distribute the load more even over all the cells in the pack... I do understand this, and do believe it is the best way... no discussion there.
I had to do it otherwise due to design reasons.

I want to know how bad it is in our type of systems to do it my way, with both terminals on the same side ?

Are the cells charged/discharged uneven? are they getting  (temporarily) out of balance in one and the same pack? hard to believe...
Are the cells in the front of the pack more stressed?
Is a setup with a (even a small) difference in lenghts of fuse wire not worse?
Internal resistance beween cells in a pack, same problems? 

In my setup busbar resistance is negligible ( 5 x 32cm copper wires of 6mm2 in "parrallel" is 0,0002 Ohm, even less with the "middle" busbar connection )
Currents more than 150A (75A / string) are rare, there are 90 cells in a pack.:
More specs here: http://secondlifestorage.com/t-Instant-powerwall

Is there a way to do some tests?

My way:


Other (right) way (thanks Peter)
___________________________________
18x 300Wp solar off grid and 10x 180Wp solar tracker grid-tie
10KW 3phase hybrid inverter. 40Kwh 18650 storage (for now)
My setup: https://secondlifestorage.com/t-Instant-powerwall
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Messages In This Thread
Mistake busbars ? - by wim - 09-19-2017, 06:06 PM
RE: Mistake busbars ? - by Korishan - 09-19-2017, 07:37 PM
RE: Mistake busbars ? - by dougal - 09-19-2017, 09:09 PM
RE: Mistake busbars ? - by jdeadman - 09-20-2017, 12:29 AM
RE: Mistake busbars ? - by Hanssing - 09-20-2017, 04:15 AM
RE: Mistake busbars ? - by daromer - 09-20-2017, 05:51 AM
RE: Mistake busbars ? - by wim - 09-20-2017, 03:21 PM
RE: Mistake busbars ? - by dougal - 09-20-2017, 04:14 PM
RE: Mistake busbars ? - by Korishan - 09-20-2017, 04:13 PM
RE: Mistake busbars ? - by wim - 09-20-2017, 05:58 PM
RE: Mistake busbars ? - by Korishan - 09-20-2017, 07:29 PM
RE: Mistake busbars ? - by wim - 09-20-2017, 08:29 PM
RE: Mistake busbars ? - by Korishan - 09-20-2017, 08:43 PM
RE: Mistake busbars ? - by wim - 09-21-2017, 05:08 AM
RE: Mistake busbars ? - by Korishan - 09-21-2017, 01:30 PM
RE: Mistake busbars ? - by SimonW - 09-21-2017, 02:11 PM
RE: Mistake busbars ? - by Korishan - 09-21-2017, 02:34 PM
RE: Mistake busbars ? - by wim - 09-21-2017, 03:21 PM
RE: Mistake busbars ? - by Korishan - 09-21-2017, 03:34 PM
RE: Mistake busbars ? - by SimonW - 09-21-2017, 03:36 PM
RE: Mistake busbars ? - by Ronny - 12-01-2019, 11:15 PM

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