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<TITLE>Re: [RE-wrenches] Irradiance data</TITLE>
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<FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Look for a super comprehensive article on the topic of production modeling in the Apr/May issue of SolarPro (SP3.3) by Tarn Yates and Bradley Hibberd of Borrego Solar. It includes information on TMY (typical meteorological year) data, like that published by NREL here:<BR>
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<a href="http://rredc.nrel.gov/solar/pubs/redbook/">http://rredc.nrel.gov/solar/pubs/redbook/</a><BR>
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David Brearley, Senior Technical Editor<BR>
<I>SolarPro</I> magazine <BR>
NABCEP Certified PV Installer ™<BR>
<a href="david.brearley@solarprofessional.com">david.brearley@solarprofessional.com</a><BR>
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On 3/3/10 9:35 AM, "Andrew Truitt" <<a href="atruitt@gmail.com">atruitt@gmail.com</a>> wrote:<BR>
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Is anyone aware of a resource for finding local historical irradiance data? We've had a cloudy winter around the DC Metro area and I would like to quantify how far down we are from the average for new customers concerned with production.<BR>
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Thanks in advance,<BR>
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Drew<BR>
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