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Available sunshine

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Posted by Karl on June 7, 2006, 2:05 am
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 $00s for it.



Posted by Steve on June 7, 2006, 3:58 am

You can download data files from:


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


Posted by dold on June 7, 2006, 5:47 am
There is a tool for sites in the US based on actual observations from
several sites.

http://solardat.uoregon.edu/SoftwareTools.html  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.

Clarence A Dold - Hidden Valley Lake, CA, USA  GPS: 38.8,-122.5

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