Setting up my solar system

CA Traveler wrote:
For 2 parallel panels no breaker required. For 3 it's a good idea. Usually fuses are used in the combiner box on the roof, not likely they will ever blow. Use 15A as 10A is to close to the panel or whatever the panel specs say. There are effects such as cloud edge that can cause max current.

I was doing some more reading and came across this article: https://www.windynation.com/jzv/inf/how-properly-fuse-solar-pv-system#:~:text=Commercially%20made%20solar%20panels%20over,30%20amps%20of%20current%20flow.&text=In%20the%20case%20of%20panels,20%20amp%20fuses%20are%20required.

"Commercially made solar panels over 50 watts have 10 gauge wires capable of handling up to 30 amps of current flow. If you connect these panels in series, there will be no increase in current flow so fusing is not required for this string. This is not the case when you have panels connected in parallel, as when connected in parallel the system current is additive. For instance if you have 4 panels each capable of up to 15 amps, then a short in one panel can draw all 60 amps towards that short-circuited panel. This will cause the wires leading to that panel to far exceed 30 amps causing that wire-pair to potentially catch fire. In the case of panels in parallel, a 30-amp fuse is required for each panel. If your panels are smaller than 50 watts, and use only 12 gauge wires, and 20 amp fuses are required."

So really I probably don't need fuses at all, since if all the current flowed through just one wire, I'd still be fine. But, after reading this, I think I'll just go with 20 amp fuses.