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Panel efficiency at STC

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  • 02-01-2024 8:24am
    #1
    Andrea B.
    Registered Users Posts: 1,918 ✭✭✭


    Can't find the answer to this one.

    Looking at panel spec sheets and working back dimensions, some things aren't adding up.

    I use a manufacturer's Wpeak, and work back to STC and reference standard of 1000W/msq.

    I get efficiency results of around 30%.

    But yet, the manufacturer has lower efficiency claims of around 20%?

    I can post example later when on PC, but it just isn't adding up for me...



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    #2
    graememk
    Moderators, Home & Garden Moderators Posts: 5,820 Mod ✭✭✭✭graememk


    Panels are roughly 1.7m x 1.1 = 1.87

    At 1000w/m2, for a 400w panel,

    400/1.87/1000 = 0.213, or 21.3%



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