An in-line resettable fuse between the panel and solar regulator can also be used as an isolator.
Useful if changing batteries where you need to connect the battery first before the solar panels to establish the operating voltage (if you have a dual voltage regulator).
My Victron charge controller on my trailer does not require a fuse between the solar panels and regulator, but I still added so I could use as an isolator.
You only get one shot at life, Aim well
2004 D2 "S" V8 auto, with a few Mods gone
2007 79 Series Landcruiser V8 Ute, With a few Mods.
4.6m Quintrex boat
20' Jayco Expanda caravan gone
Actually was simpler to add an inline circuit breaker fuse with manual reset.
May not be needed but it is very good practice.
Cheap insurance.
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