31 Dec '12, 5am

New #photovoltaics rating system improves on standard test conditions (STC) by considering real-world variations #solar

Newsbrief from Environmental Building News New PV Rating System Models Real-World Test Conditions By Erin Weaver A new rating system for photovoltaic modules aims to improve upon standard test conditions (STC) by more fully reflecting real-world variations. The Principal Solar Institute (PSI), created by solar energy holding company Principal Solar, Inc., has introduced the PSI PV Module Rating to help the commercial and utility-scale markets compare the performance and cost of modules. Compared to STC, which uses a constant light intensity at a fixed temperature, PSI models daily variations in light and temperature, as well as five other factors, to calculate total expected energy production over a module’s 25-year lifetime. Ratings for 500 modules are available on PSI’s website, with 10,000 more available upon request. December 1, 2012 DISCUSSIONS There are no comments f...

Full article: http://www.buildinggreen.com/auth/article.cfm/2012/11/29/...

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