Difficult to tell exactly what's up from the photo. Gives the impression an object (e.g. hailstone) struck the PV at the "lower center" of the cell on the left. The impact didn't break the tempered glass, but was sufficient mechanical shock to fracture the two cells shown. I've got an old Siemens 16-2000 with cracked cells, and the pattern is almost identical.
Mavrick's comment (below) is on target. To continue with his thought... A quick Isc test on a clear day around solar noon comparing this PV to adjacent (and presumably unblemished?) PV would give insight whether or not the output current has been affected. Dan --- On Wed, 11/9/11, maver...@mavericksolar.com <maver...@mavericksolar.com> wrote: From: maver...@mavericksolar.com <maver...@mavericksolar.com> Subject: Re: [RE-wrenches] Canadian Solar "blemish" To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org> Date: Wednesday, November 9, 2011, 9:35 PM I have seen this pattern twice. 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. 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. 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. Thank you, Maverick Maverick Brown BSEET, NABCEP Certified Solar PV Installer ® President & CEO Maverick Solar Enterprises, Inc. Office: 512-919-4493 Cell: 512-460-9825 Sent from my HondaJet! On Nov 9, 2011, at 3:41 PM, penobscotso...@midmaine.com wrote: > 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 > <CS210-Midkiffsm.jpg> > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > 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: RE-wrenches@lists.re-wrenches.org 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
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