Duh, for some reason I was thinking power distribution panel....(slapping forehead)Solar panels, the link has examples.
The specs I have say the panels are rated a 5.56a at optimum operating current and says there is a temp range of -40 to176f. Does say max series fuse rating is 15A. I don't know if that helps answer your question.
I wrote the dealer who is Battle Born as Victron doesn't want direct contact it seems. I also sent the diagram to see if they will comment.I'd write/call them and ask then. If they're speccing a 300A fuse that means they expect there can be 300A on it, in which case the wire gauge might be off.
Worse of all, could be some kind of peak rating that it could produce for a nano second.Not sure... possibly those ratings are the maximum ratings rather than the continuous ones?
Still need to know what kind of wire to use under the TT floor between power center and battery center...