Fusing solar

Thanks guys.

Running #6 will fuse at 40 amps next to battery.

What brand controller do you have? Post all the facts, not just your question.

Morningstar says to comply with NEC the fuse (battery to controller) s/b rated at least 20% over the controller rating and wire should have ampacity to match the fuse. So you are looking at 40 amp fuse and #8 wire minimum afaik. Fuse s/b close to the battery not the controller. If you are pushing near 30 amps I would have #6 wire minimum assuming wire fits the controller lugs.

Fuses are to protect the wire between items. Fuse to the wire size. i.e. #10 30 amp, #12 20 amp, etc.

Rail Dawg wrote:
If the controller is 30amp do you fuse the line for 30amps.

Doesn’t the controler’s manufacturer state the fuse requirements? WindyNation does.