…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.
Additional resources still need to be added for this topic
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