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Sorry this may seem like a stupid question, but what cable size should I make the midpoint linking cable?
Should the gauge and length match the pos/neg cables going to the busbars? Or does it not really matter as if everything is ok, there will be no current flow?
Yes theoretically if everything is perfectly balanced the current flow would be 0.
But in reality there would be a small current flow under normal conditions & if something goes wrong the current flow could be significant.
So I would recommend to use a cable that is at least ~1/2 the size of main cables if un-fused.
But if you add a fuse in between to protect for a worst case scenario then you could go smaller - just ensure the current rating of the cable is higher than the fuse.
Length does not really matter with this cable & it does not need to 'match' anything.
Hi nicely explained.
See also the new Wiring unlimited book, it has a chapter on this:
https://community.victronenergy.com/questions/10063/wiring-unlimited-a-new-book.html
You’re welcome to drop a note there to Margreet in case you have suggestions (the fuse is nice)
