<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Difficult to tell exactly what's up from the photo.<br><br>Gives the impression an object (e.g. hailstone) struck the PV at<br>the "lower center" of the cell on the left. The impact didn't break<br>the tempered glass, but was sufficient mechanical shock to fracture<br>the two cells shown. I've got an old Siemens 16-2000 with cracked<br>cells, and the pattern is almost identical.<br><br>Mavrick's comment (below) is on target. To continue with his thought...<br><br>A quick Isc test on a clear day around solar noon comparing this PV<br>to adjacent (and presumably unblemished?) PV would give insight<br>whether or not the output current has been affected.<br><br>Dan<br><br><br>--- On <b>Wed, 11/9/11, maverick@mavericksolar.com <i><maverick@mavericksolar.com></i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255);
margin-left: 5px; padding-left: 5px;"><br>From: maverick@mavericksolar.com <maverick@mavericksolar.com><br>Subject: Re: [RE-wrenches] Canadian Solar "blemish"<br>To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org><br>Date: Wednesday, November 9, 2011, 9:35 PM<br><br><div class="plainMail">I have seen this pattern twice.<br><br>1. Lightning strike near the array. But the canals are bright white or deep black. I have two of those panels for testing and they still work sorta.<br><br>2. A bad batch of EVA or an over-cooked batch of EVA during assembly perhaps. Of course, the photo does not lend itself to determining the depth of the fracture: at the glass layer, at the EVA layer or at the silicon layer. If it is at the silicon layer, then the current would drop. <br><br>Fort that panel, Each cell is a 0.5 volt generator at About 3 amps or so. If you crack the cell (Cleve it straight across) it becomes a 0.5 volt 1.5 amp cell. So I
think it would mess with your vmp overall if the silicon was cracked.<br><br><br>Thank you,<br><br>Maverick<br><br><br>Maverick Brown<br>BSEET, NABCEP Certified Solar PV Installer ®<br>President & CEO<br>Maverick Solar Enterprises, Inc.<br>Office: 512-919-4493<br>Cell: 512-460-9825<br><br>Sent from my HondaJet!<br><br>On Nov 9, 2011, at 3:41 PM, <a ymailto="mailto:penobscotsolar@midmaine.com" href="/mc/compose?to=penobscotsolar@midmaine.com">penobscotsolar@midmaine.com</a> wrote:<br><br>> Hello all,<br>> We have a customer who has acquired, over the last ten years or so, a<br>> large array with several different makes and models of panels, all<br>> installed by a qualified electrician and the customer. They have done<br>> an excellent job as far as self installed systems go.<br>> He just sent me a picture of one of his Canadian Solar 210's with
a<br>> very unusual pattern on it (actually under the glass). The panel is<br>> about three years old and shows no decline in output, but he is<br>> concerned with the very obvious visible pattern. I have never seen<br>> anything like it.I've attached it to this email. Anyone?<br>> <br>> Thanks for any suggestions or ideas,<br>> Daryl<br>> <CS210-Midkiffsm.jpg><br>> _______________________________________________<br>> List sponsored by Home Power magazine<br>> <br>> List Address: <a ymailto="mailto:RE-wrenches@lists.re-wrenches.org" href="/mc/compose?to=RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br>> <br>> Options & settings:<br>> <a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br>> <br>> List-Archive: <a
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