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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.


  2. Steve

    Steve Guest

    You can download data files from:

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

  3. Guest

    There is a tool for sites in the US based on actual observations from
    several sites. has some tools that show the
    sun path across the sky, and other reports, using the nrel data.
    is useful, and I recall uses the nrel data as well.
    is just generally a good place to look.
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