nuggetgalore wrote:Should I aim to get the same amperage or as suggested by some to go to 30 A? I a m less concerned with the body type, I can make it fit.
We've been ignoring the possibility of some sort of fault that ends up pushing say 25 A through the wires to the fuse. It's unlikely, but it could happen, and if it does, it could start a fire. The main job of the fuse is to protect the wire.
The wire on one side looks like it's barely 2.5 mm², if so safe to about 22 A. So I'm going to say that from a safety perspective, we really should go to the trouble of finding a 20 A rated fuse.
I note that the Eaton fuse
I found is rated at 20 A (they don't make these PV fuses with a rating higher than 20 A). But they are out of stock at present (other suppliers might have that part number in stock). The manufacturer says it's specifically designed as a photovoltaic fuse, which also has me slightly worried. I don't know much about fuse selection, other than the need to have a DC rating. It's also about 50% more expensive, possibly because it's rated for 1000 VDC.
Is there a cross sectional area marking on the thinner of the two wires, or an AWG designation?