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Available sunshine

Discussion in 'Photovoltaics' started by Karl, Jun 7, 2006.

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  1. Karl

    Karl Guest

    I have seen a publication or reference which had historical data for
    'days of available sunshine' for various cities in the US. I would
    guess that this is very basic information for designing a solar
    photovoltaic or thermal system. Can someone suggest a source for this
    information? I know the Weather Bureau has collected this information,
    but they want $100s for it.

    Thanks,

    Karl
     
  2. Steve

    Steve Guest

    You can download data files from:

    http://rredc.nrel.gov/solar/

    For PV systems there is a solar calculator PVWATTS. You'll find a link at
    the nrel site.

    Steve
     
  3. Guest

    There is a tool for sites in the US based on actual observations from
    several sites.
    http://rredc.nrel.gov/solar/codes_algs/PVWATTS/version1/


    http://solardat.uoregon.edu/SoftwareTools.html has some tools that show the
    sun path across the sky, and other reports, using the nrel data.

    http://www.kyocerasolar.com/products/pv_calculator.html
    is useful, and I recall uses the nrel data as well.

    http://www.builditsolar.com
    is just generally a good place to look.
     
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