Fuse or Breaker

mwilsonnmmwilsonnm Posts: 26Solar Expert
When installing dc disconnects between the array and controller or the batteries and dc distribution panel does it make any difference (as far as safety is concerned) whether you use a fuse or breaker configuration? Thanks, Mark


  • mike95490mike95490 Posts: 7,956Solar Expert ✭✭✭✭
    Re: Fuse or Breaker

    It depends on you access. If easy to access, a replaceable fuse would be OK.

    In a rooftop PV string, where PV shorts are RARE, I'd use a fuse. (with anti-oxi grease)

    Just my 2 cents worth

    Fuse notes - run fuses at 80% or less, of "blow" rating, otherwise, they are subject to random failures.
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  • nielniel Posts: 10,311Solar Expert ✭✭✭✭
    Re: Fuse or Breaker

    no difference except the breaker is more like a switch that can be flipped back to be reused at a higher price than its fuse counterpart.
    as far as accessibility goes it should be within easy reach at all times of the year so fuses/circuit breakers and disconnects should not be going onto a roof that needs ladders or weather cooperation to gain access to it.
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