Tools and Data
The Soltrex, Solar School House and Heliotronics Sunviewer all provide online graphing tools. The chosen power or irradiance data can be subset by time periods from hourly up to annual. The graphing tools are described in Parts 2 and 3.
Solar Schoolhouse Choose a school.
Sunviewer from Heliotronics Choose from sites listed.
From Heliotronics tool Sunviewer: Teacher Lessons and Tips
There are pdf files there that give some information on units of energy versus power and what the shape of a graph of solar power might mean. One such file is available for classroom use with proper citation to Heliotronics, Inc. Heliotronics Sunviewer Tutorial (Acrobat (PDF) 222kB Dec29 09)
Soltrex has 314 systems in 13 states as of December 2009
Heliotronics has 180 monitored sites in the US and Canada, but publicly available data is limited to 3 sites currently.
Solar School House has 128 monitored sites, primarily at schools.