
The PV Power Map is a report of national solar resource availability as illustrated by the monthly energy output of a nominal 1-kilowatt (kW) photovoltaic (PV) system by location. Comparing monthly maps makes it possible to see how irradiance and associated PV system power output vary over time from region to region, often with unexpected results. For example, compare January and February solar resource availability on the eastern seaboard with the Gulf Coast.

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Dona McClain’s first day at the American Solar Energy Society (ASES) was in January 1984. She will retire at the end of this month.

The PV Power Map is a monthly report of national irradiance levels as illustrated by solar power potential. Comparing November and December 2011, December shows slightly higher power production along the West Coast, reflecting the relatively mild, clear weather the region experienced that month.

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