wim
Member
- Joined
- Apr 6, 2017
- Messages
- 556
Hi all,
Did i made a (big)mistake in the design of the busbars in my setup ? :huh:
Afew members made a correct observation in my build thread, so just a bit unsure
I know the general idea of the busbarson the packs is to dothe terminals of thepositive side opositto the negative side. This to distribute theload moreeven 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, withboth 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 cellsin a pack, same problems?
In my setup busbar resistance is negligible ( 5 x 32cmcopperwires of 6mm2 in "parrallel"is0,0002 Ohm, even less with the "middle"busbar connection)
Currents more than 150A (75A / string)arerare,there are90 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)
Did i made a (big)mistake in the design of the busbars in my setup ? :huh:
Afew members made a correct observation in my build thread, so just a bit unsure
I know the general idea of the busbarson the packs is to dothe terminals of thepositive side opositto the negative side. This to distribute theload moreeven 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, withboth 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 cellsin a pack, same problems?
In my setup busbar resistance is negligible ( 5 x 32cmcopperwires of 6mm2 in "parrallel"is0,0002 Ohm, even less with the "middle"busbar connection)
Currents more than 150A (75A / string)arerare,there are90 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)