…In between single 250w solar panel and 75/15 smart solar controller?
You don't need a fuse for a single panel. A solar isolator switch is a must
You should not disconnect by opening up a fuse under load. Arcing is a thing. Less likely with such a small system but still potential for disaster.
I know you can switch off in software first before disconnecting but if there happens to be an emergency situation there is no time for that.
Fuses & fuse holders Product Page.
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