by lrrowe » Sun Jan 03, 2016 10:38 pm
Some us probably go too far overboard, but for my battery to my PD4045 controller I ran 4 GA. For my common ground lines I ran 8 GA (to ground strips) and then used 12 GA for 12V and USB sockets. Probably too much. Lighting was 12 and mostly 14 GA depending on the number of lights on it and type (i.e. my outside spots used 12 GA).
Please do take it that I am any expert, but this is what I did. And I typically overdue most all things like this. There are many prior posts and wiring diagrams with sizes on them. Too many for me to list, but you could use the search feature to rummage through them. Lots of good stuff is there.