Posted March 15, 20232 yr I need to choose a fuse to use on my PV strings of 330W Japan Solar panels @ STC Short circuit current is 9.28A Max Power current is 8.77A @ NOCT Short circuit current is 7.4A Max Power current is 6.97A Which value do I base my fuse requirements on? STC or NOCT values, and short circuit current or Max Power current? If fuses are meant to be the current plus 25% it would be either a 12A or 10A, depending on which values I use?
March 15, 20232 yr Author So then does it work like so? PV cable diameter amp rating PV fuse (amperage less 25%) 4mm 55A ~40A 6mm 70A ~50A 10mm 98A ~75A
March 15, 20232 yr Author 9 hours ago, P1000 said: Based on the cables used. https://www.explorist.life/how-to-fuse-a-solar-panel-array-and-why-you-may-not-need-to/#:~:text=Each solar panel has a,What is this%3F&text=Since the Maximum Series Fuse,handle a max of 15A. https://pqrs.co.za/solar-pv-fuse-considerations/ Upon further reading, based on these two references, where in my case, my panels are all in series on a single string. I actually don't need a fuse. A fuse is only of value when you have number of strings in parallel, and IS based on the short circuit rating of the panel, and the number of strings in parallel.
March 17, 20232 yr the panel specs usually state rated fuse to to use. just using your description i found specs for Japan Solar JPS-330P-72 (330W) solar panels, stating a 20amp fuse is required for series strings.
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