What value fuse in solar cable ?

Discussion in 'Solar Power' started by Mike4727, Feb 20, 2016.

  1. Mike4727

    Mike4727 Funster

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    I am sure I have seen this info somewhere but cannot bring it up on search. I have just installed 120w panel wired through mppt controller to 100amp leisure battery and I understand that I should have inline fuse on positive side between controller and battery but can someone advise what value fuse this should be please, thanks
     
  2. Techno

    Techno Funster Life Member

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    15amp is plenty , you won't blow that with 120 watts
     
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  3. Mike4727

    Mike4727 Funster

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    Thanks Andy, is that the only fuse I need to put in - or would you normally put fuse between panel and controller - I noticed a label with "lightening "type symbol on the positive cable from the panel.
     
  4. Techno

    Techno Funster Life Member

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    The instructions do not call for a fuse on the panel side BUT I fit one simply to isolate the panel if required. If you do choose to fit one just make it a big one
     
  5. Mike4727

    Mike4727 Funster

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    Ah, that's ok then - if I need to isolate the panel I can just disconnect at the panel tails I guess. Thanks for the help Andy, another job off the list :)
     
  6. icantremember

    icantremember Funster

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    How big would you suggest Andy?
     
  7. Techno

    Techno Funster Life Member

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    That depends on the fuse holder used
    A regular auto only goes to 30amp
    I have a 50 amp bus fuse which comes on 6mm cable so only needed one through crimp and straight into the regulator
     
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  8. pappajohn

    pappajohn Funster Life Member

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    Never really considered a fuse in the input line.
    Maybe i should know, but i dont.... how can you put a 12v fuse of any amp value in an unregulated 17v to 21v panel to controller line without it overloading ?
     
  9. Techno

    Techno Funster Life Member

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    Why would it overload
     
  10. pappajohn

    pappajohn Funster Life Member

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    Rated at 12v but recieving 17v to 21v

    Never even considered voltage through a fuse before so Im having an 'act stupid' day
     
  11. John Laidler

    John Laidler Funster

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    I've never heard of voltage rated fuses - other than some, which are the sort we are talking about, are designed for low, non-lethal voltages, but they are not voltage specific.
     
  12. Techno

    Techno Funster Life Member

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    A fuse is only a conductor and in this instance not used for over current protection but for isolation
     
  13. pappajohn

    pappajohn Funster Life Member

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    :doh: as i said, never even thought about it.
     
  14. JeanLuc

    JeanLuc Funster

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  15. Techno

    Techno Funster Life Member

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