How to fit 4gauge wire in 6gauge terminals?
I'm adding another solar panel and upgrading the wire on my solar install. I have quite a bit of 4gauge wire that I was planning on running to the roof but now I notice my controller only accepts 6ga...
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Nothing wrong with your second option. Clearly you don't need the full capacity of the 4 for your system. And a few mm length of reduced diameter has negligible effect on resistance anyway.
