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Old 06-11-2018, 07:40   #31
Zil
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Join Date: Mar 2013
Location: South Jersey
Posts: 360
Re: Circuit Breaker on Solar system

Noelex has it. We consider the source of the power when protecting wires. With one panel, the amps are less than the wire can conduct, so no need for a fuse, even a dead short will not be harmful. With three panels in parallel, along with a fault in one panel, the other panels can back-feed with 2 times the amps. Four panels in parallel, 3 times the amps back feed to a short. That may be over-amp for the wire. So with parallel panels, each must have a fuse to protect from that problem. It is helpful to have a switch to disconnect the panels from the controller. I use a DPST battery disconnect to do the panels and battery with one turn.

I leave you on your own as for ratings of fuses/breakers or anything designed on your system, but, please do have fuses at the battery positive. Mainsail has an article about voltage drop on wires, fuses, and connections. Worthwhile to read.
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