Thanks for that Allan, I should add that there does not appear to be any cracking of the cell to the customer when compared to non-effected cells. It is just that strange "shape" ,"shading" , "design" underneath the glass on that particular panel and cells....this is according to the customer, who is of above average intelligence and knowledge of things solar.....
Daryl > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> > <html> > <head> > <meta content="text/html; charset=ISO-8859-1" > http-equiv="Content-Type"> > </head> > <body bgcolor="#ffffff" text="#000000"> > Daryl,<br> > Before offering my opinion, I'll note that it's only that, and I'd > hope to learn from others with more knowledge of PV cell structure > than I have. Given that, it appears to me that the silicon wafers > that make up these cells are extensively cracked. It likely will > have little effect on cell output, as the electrons that are knocked > out of their orbits by the photons of light must only move through > the silicon semiconductor as far as the microgrid of conducting > traces visible on the surface; that is, few if any need to bridge > any of these apparent cracks in order to reach the conductive > traces.<br> > <br> > At my own off-grid home, all of my (BP85-90 W) modules are from the > mid-nineties. Many of the cells on about 10 of the 18 modules are > extensively cracked in similar ways, as they came from an abandoned > (good idea that didn't work out) system from a local Boys' and > Girls' Club. When I bought the dead system (quite cheaply), 8 out of > 18 modules had been shattered by kids using it as a target for > throwing rocks. All of the intact modules have multiple cracked > cells and even chipped cover glass. All continue to perform after 15 > years with only a little more than predictable degradation.<br> > <br> > But to repeat, I'm interested in others' opinions, as I may be > completely off base here.<br> > Allan<br> > <br> > <div class="moz-signature"> > <meta http-equiv="content-type" content="text/html; > charset=ISO-8859-1"> > <title></title> > <font face="Times New Roman, Times, serif"><b>Allan > Sindelar</b></font><br> > <small><a href="mailto:[email protected]";><font > color="#000099" face="Times New Roman, Times, > serif"><u>[email protected]</u></font></a></small><font > face="Times New Roman, Times, serif"><br> > <span style="font-size: 10pt;">NABCEP Certified Photovoltaic > Installer<br> > NABCEP Certified Technical Sales Professional<br> > New Mexico EE98J Journeyman Electrician<br> > <b>Positive Energy, Inc.</b><br> > 3201 Calle Marie<br> > Santa Fe, New Mexico 87507<br> > <b>505 424-1112</b><br> > <a href="http://www.positiveenergysolar.com/"; > target="_blank"><u>www.positiveenergysolar.com</u></a><o:p></o:p></span></font> > <p class="MsoNormal" style="margin-right: 722.25pt;"><span > style="font-size: 10pt;"><font face="Times New Roman, Times, > serif"><st1:place w:st="on"><st1:city > w:st="on"></st1:city><st1:state > w:st="on"></st1:state><st1:postalcode > w:st="on"></st1:postalcode></st1:place></font><b > style=""><br> > </b></span></p> > <span style="font-size: 10pt;"><br> > </span> </div> > <br> > On 11/9/2011 2:41 PM, <a class="moz-txt-link-abbreviated" > href="mailto:[email protected]";>[email protected]</a> > wrote: > <blockquote > cite="mid:[email protected]" > type="cite"> > <pre wrap="">Hello all, > We have a customer who has acquired, over the last ten years or so, a > large array with several different makes and models of panels, all > installed by a qualified electrician and the customer. They have done > an excellent job as far as self installed systems go. > He just sent me a picture of one of his Canadian Solar 210's with a > very unusual pattern on it (actually under the glass). The panel is > about three years old and shows no decline in output, but he is > concerned with the very obvious visible pattern. I have never seen > anything like it.I've attached it to this email. Anyone? > > Thanks for any suggestions or ideas, > Daryl</pre> > <pre wrap=""> > <fieldset class="mimeAttachmentHeader"></fieldset> > _______________________________________________ > List sponsored by Home Power magazine > > List Address: <a class="moz-txt-link-abbreviated" > href="mailto:[email protected]";>[email protected]</a> > > Options & settings: > <a class="moz-txt-link-freetext" > href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org";>http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a> > > List-Archive: <a class="moz-txt-link-freetext" > href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org";>http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a> > > List rules & etiquette: > <a class="moz-txt-link-abbreviated" > href="http://www.re-wrenches.org/etiquette.htm";>www.re-wrenches.org/etiquette.htm</a> > > Check out participant bios: > <a class="moz-txt-link-abbreviated" > href="http://www.members.re-wrenches.org";>www.members.re-wrenches.org</a> > > </pre> > </blockquote> > </body> > </html> > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
