Greenhouse Backup Plan

Got into some spot welding on my first pack recently and I'm thinking about the pattern for soldering on the 6 gauge wire and also for attaching the two parallel fused nickel strips. Opinions on which of these two photos would be better, or any adjustments to the bridging nickle strips (longer for example)? Also, any advice for soldering the 6 gauge - particularly the interval?
 

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I would say the left one, the 2 parallel loops of equal size, would probably be better. Altho, to be completely honest, unless you are pulling max amps, probably wouldn't make a big difference on either design considering how much nickle plating there is to distribute the loads.
For the bridge between the two, I'd say put a nickel strip between each cell, not every other one like you have in the images.
 
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