Ladies and Gentlemen—Start your pyrheliometers!

By Eileen De Guire / November 7, 2011

I Pyreheliometers are pointed toward the sun for their yearly calibrationat NREL. Accurate measurement of solar energy is needed for due diligence of photovoltaic installations. Credit: NREL. If you have one, you probably were at the 16th annual convening of the NREL Pyrheliometer Comparisons in October in Golden, Colo. If you don’t have one, it…

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