<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>Drake, I measured and published a paper in 1992 on the after 10 year performance of solar modules, my study concluded these modules degraded approximately 1% per year. The purpose of the study was the effect on utility demand.</DIV>
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<DIV>I have heard there are some very good studies with similar results.</DIV>
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<DIV>Thank you--Darryl<BR><BR>--- On <B>Fri, 4/9/10, Drake Chamberlin <I><drake.chamberlin@redwoodalliance.org></I></B> wrote:<BR></DIV>
<BLOCKQUOTE style="BORDER-LEFT: rgb(16,16,255) 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><BR>From: Drake Chamberlin <drake.chamberlin@redwoodalliance.org><BR>Subject: Re: [RE-wrenches] Voltage degradation<BR>To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org><BR>Date: Friday, April 9, 2010, 12:24 AM<BR><BR>
<DIV id=yiv25405796>What is the documentation for 10% module voltage degradation? I have heard different ideas on what will degrade over how much time. For direct grid tie, I shoot for a voltage drop 1% maximum on the DC side.<BR><BR>Thanks,<BR><BR>Drake <BR><BR>At 11:08 AM 4/8/2010, you wrote:<BR>
<BLOCKQUOTE class=cite cite="" type="cite">I usually keep in mind that the modules will degrade by 10% However, if you are one of those wrenches promoting 3% DC Voltage Drops, maybe you should add some more.<BR> <BR>Nick Soleil<BR>Project Manager<BR>Advanced Alternative Energy Solutions, LLC<BR>PO Box 657<BR>Petaluma, CA 94953<BR>Cell: 707-321-2937<BR>Office: 707-789-9537<BR>Fax: 707-769-9037<BR><BR><BR><BR><FONT size=2 face=Tahoma><B>From:</B> Drake Chamberlin <drake.chamberlin@redwoodalliance.org><BR><B>To:</B> re-wrenches@lists.re-wrenches.org<BR><B>Sent:</B> Tue, April 6, 2010 1:58:56 AM<BR><B>Subject:</B> [RE-wrenches] Voltage degradation<BR></FONT><BR>Esteemed Wrenches, <BR><BR>How much voltage overhead should we have available on our arrays to allow for inverters not to fall out of their DC voltage operating range? Since the module power degradation is 20% over the warranty period, I usually shoot for a module voltage that
can drop 20% and still be within the MPPT range of the inverter under the average high temperatures, since most of the degradation is in voltage.<BR><BR>Am I being too conservative with this number? It always pushes the number of modules to the top of what is allowable on the string for the extreme low. <BR><BR>Thanks,<BR><BR><FONT color=#0000ff>Drake Chamberlin<BR>Athens Electric<BR>OH License 44810<BR>CO License 3773<BR>NABCEP </FONT><FONT color=#0000ff size=1>TM </FONT><FONT color=#0000ff>Certified PV Installer <BR>Office - 740-448-7328<BR>Mobile - 740-856-9648 <BR></FONT><BR>_______________________________________________<BR>List sponsored by Home Power magazine<BR><BR>List Address: RE-wrenches@lists.re-wrenches.org<BR><BR>Options & settings:<BR><A href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" rel=nofollow target=_blank>http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</A>
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<DIV><FONT color=#0000ff>Drake Chamberlin<BR>Athens Electric<BR>OH License 44810<BR>CO License 3773<BR>NABCEP </FONT><FONT color=#0000ff size=1>TM </FONT><FONT color=#0000ff>Certified PV Installer <BR>Office - 740-448-7328<BR>Mobile - 740-856-9648 </FONT></DIV></DIV><BR>-----Inline Attachment Follows-----<BR><BR>
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