I have always used 4/0 through out the bank.
I guess that I have had to replace to many dead batteries at this point.
If you are under sizing the parallel strings, what happens when a cell
fails? or 2 cells fail.
Now all the current would be carried by one string.
If you are running equal lengths to a buss bar, it might make sense to
put a current limiting fuse on each parallel run before the bus.
However, this would pretty much negate any money save on downsizing
the copper.
So what is really gained?
Doug Wells
The Solar Specialists
Morrisville, VT 05661
(p) 802-223-7014
(c) 802-498-5856
www.thesolarspecialists.com
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