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Solar panel wattage

  • 12-01-2021 1:55pm
    #1
    Registered Users Posts: 5 noelocon


    Hi,
    I got a quote last year for 3.24Kw using 12 x 270 watt OSolar panels all placed on a roof facing directly south.
    Just wondering is it better to go with higher watt panels or does it matter considering the intermittent direct sunlight we get here in Ireland.


Comments

  • Registered Users Posts: 2,683 ✭✭✭ graememk


    noelocon wrote: »
    Hi,
    I got a quote last year for 3.24Kw using 12 x 270 watt OSolar panels all placed on a roof facing directly south.
    Just wondering is it better to go with higher watt panels or does it matter considering the intermittent direct sunlight we get here in Ireland.

    I dont think they even sell a 270w panel anymore

    320 is nearly the standard but a lot more are 340-360, and some 400w panels are about.


  • Moderators, Category Moderators, Motoring & Transport Moderators, Regional East Moderators Posts: 58,818 CMod ✭✭✭✭ unkel


    graememk wrote: »
    320 is nearly the standard but a lot more are 340-360, and some 400w panels are about.

    With the note that the 320w is a standard size panel and 340-360w and particularly 400w+ panels are considerably bigger and heavier

    "Wind is Ireland's oil" - An Taoiseach, 25/05/2022



  • Registered Users Posts: 2,683 ✭✭✭ graememk


    unkel wrote: »
    With the note that the 320w is a standard size panel and 340-360w and particularly 400w+ panels are considerably bigger and heavier

    Oh Yeah the longi 360's are big!


  • Registered Users Posts: 2,787 ✭✭✭ irishchris


    graememk wrote: »
    Oh Yeah the longi 360's are big!

    Tell me about it, I had to lift six of them in yesterday from delivery!


  • Moderators, Category Moderators, Motoring & Transport Moderators, Regional East Moderators Posts: 58,818 CMod ✭✭✭✭ unkel


    graememk wrote: »
    Oh Yeah the longi 360's are big!

    And heavy :D

    Bad enough to lift them onto the roof yourself and then climb onto the roof after them to move them around and install them

    "Wind is Ireland's oil" - An Taoiseach, 25/05/2022



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  • Registered Users Posts: 1,627 ✭✭✭ quentingargan


    Bear in mind also that in many cases, when you do wind loading calcs, the 72/144 cell 400w+ panels need three rails rather than two.


  • Moderators, Society & Culture Moderators Posts: 31,245 Mod ✭✭✭✭ Gumbo


    noelocon wrote: »
    Hi,
    I got a quote last year for 3.24Kw using 12 x 270 watt OSolar panels all placed on a roof facing directly south.
    Just wondering is it better to go with higher watt panels or does it matter considering the intermittent direct sunlight we get here in Ireland.

    12x340w panels would be nice.

    The 400w panels are quite big so you may not fit 12. Work out the biggest array you can get.


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