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Solar PV on a Flat Roof - Working width

  • 20-04-2023 10:30pm
    Registered Users Posts: 309 ✭✭


    Would appreciate some advice.

    What flat roof width would be required for a landscape run of 3 No. 1.7m panels? I want to be SEAI grant compliant.

    And separately, if I put in parapets on both sides, would this affect the roof width required?

    Many thanks,



  • Registered Users Posts: 309 ✭✭william

    Could anyone give me a steer on this? What I'm hoping to hear is a roof width of 6.1m inclusive of parapets! Thanks.

  • Registered Users Posts: 1,443 ✭✭✭DC999

    Can't recall the gap from the edge. The SEAI site should have it under the solar grant section.

  • Registered Users Posts: 4,431 ✭✭✭Gerry

    The edge gap is 500mm from memory so yes, but I was looking at pitched roof at that time. You should get the full document from seai site and confirm.

  • Registered Users Posts: 309 ✭✭william

    Thanks DC999 and Gerry. I found the SEAI doc and the 500mm appears correct.

  • Registered Users Posts: 1,443 ✭✭✭DC999

    You'll get 5 in width then as 1m wide. And you have 6.1m width you said.

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  • Moderators, Home & Garden Moderators Posts: 6,003 Mod ✭✭✭✭graememk

    More like 1.1m

    The Longis I have are 1.135m + 20mm for the clamps, that's pushing you down to 4 if trying to stay within the Seai grant specs

    But if it was done after the grant is cleared you would fit 5 no bother.

  • Registered Users Posts: 309 ✭✭william

    Thanks everyone for the advice. Much appreciated.