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randomprocess asked

MPPT String Isolation

Hi,

Can someone please advise if there is any isolation (fuses or other) between the MC4 inputs on a 150/100 or 250/100 charge controller? I need to confirm if string fusing is required when using multiple inputs. IE: will current flow from strings A and B to string input C during fault conditions on input C, or is the current limited or otherwise isolated.

MPPT Controllers
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1 Answer
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JohnC answered ·

Hi R. As I understand it, it's just a common bus - a convenience thing.

So yes, take the necessary external precautions. It's your choice, but I like to use double pole dc breakers (Noark) for that.

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