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
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