<div dir="ltr">Jerry<div><br></div><div>Unfortunately snail trails are a clear indication of micro cracks that will in time open up and degrade the output of the module substantially. They may not have a performance problem yet , but give it time to show up! It usually takes awhile for the snail trail to appear, the micro cracks allow ions to pass through the cell attracted by the polarity and cause the discoloration around the micro cracks. I have heard of initial installs with them , which is a very bad sign, and the same response from the manufacturer that it does not effect performance ( yes they were flash tested with the micro cracks present). IMHO it is a manufacturing defect and has nothing to do with performance....yet, and should be covered under manufacturing defects! Good luck with that though! I am sure that we have had this problem all along, but because we are seeing 1000 vdc transformer-less systems it is occurring more quickly.</div><div><br></div><div>Bill Hoffer</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jul 16, 2015 at 10:33 PM, jerrysgarage01 <span dir="ltr"><<a href="mailto:jerrysgarage01@gmail.com" target="_blank">jerrysgarage01@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div>Wrenches</div><div>We used to use Sharp but now its Trina, containers of 250 watt modules, data logging has not shown any abnormal power loss. Now that I say this Trina as the story goes debates there data so that is true it softens the blow a little. I have seen some another brand that are cracking poly cells looks like snail tracks, manufacture says it does not effect performance</div><div>Jerry</div><div><br></div><div><br></div><div><div style="font-size:9px;color:#575757">Sent via the Samsung Galaxy S™ III, an AT&T 4G LTE smartphone</div></div><div><div class="h5"><br><br><div>-------- Original message --------</div><div>From: <a href="mailto:boB@midnitesolar.com" target="_blank">boB@midnitesolar.com</a> </div><div>Date:07/16/2015 4:01 PM (GMT-10:00) </div><div>To: RE-wrenches <u></u> </div><div>Subject: Re: [RE-wrenches] Trina Module Annual Degradation </div><div><br></div><br><br>It's too bad that when a module goes to a REAL high degradation, like, <br>100% down to nothing<br>before that 25 year "warranty" is up, that it is NOT considered <br>degradation and is not covered<br>under "warranty".<br><br>P.S. This has nothing to do with Trina or any PV company in particular.<br><br>boB<br><br>On 7/16/2015 6:24 PM, jay wrote:<br>> HI Peter,<br>><br>> I’ll bite.<br>><br>> From the folks I know who deal with multi mega watt systems, are seeing less than that level of degradation.<br>><br>> That said, the standard module 25 yr warranty to 80% is just on .7% year if I have my math correct.<br>><br>> jay<br>><br>> peltz power<br>><br>><br>><br>><br>>> On Jul 16, 2015, at 9:08 AM, Peter Parrish <<a href="mailto:peter.parrish@calsolareng.com" target="_blank">peter.parrish@calsolareng.com</a>> wrote:<br>>><br>>> I have recently been in discussion with a company that builds a large number<br>>> of medium-sized PV ground mount system (30 kW to over 100 kW). They claim<br>>> that they have been seeing something on the order of 0.7% annual degradation<br>>> in the output of their systems due to intrinsic degradation in the PV<br>>> modules. They also claim that this number is supported by the PV module<br>>> manufacturer. Many years ago (2007?) I remember reading a report containing<br>>> data gathered by NREL that showed the number was about 0.4%, and I thought<br>>> the number was actually decreasing over time.<br>>><br>>> The module in question is the Trina TSM-310 (PA14.8, I believe, if it makes<br>>> any difference).<br>>><br>>> Has anyone read anything recent about annual degradation in general or Trina<br>>> modules in particular?<br>>><br>>> - Peter<br>>><br>>> Peter T. Parrish, Ph.D.<br>>> President, SolarGnosis<br>>> 1107 Fair Oaks Ave. Suite 351<br>>> South Pasadena, CA 91030<br>>> NABCEP Certified PV Installer #031806-26<br>>> <a href="tel:%28323%29%20839-6108" value="+13238396108" target="_blank">(323) 839-6108</a><br>>> <a href="mailto:petertor@pobox.com" target="_blank">petertor@pobox.com</a><br>>><br>>><br><br>_______________________________________________<br>List sponsored by Redwood Alliance<br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a><br><br>Change listserver email address & 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 href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html" target="_blank">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm" target="_blank">www.re-wrenches.org/etiquette.htm</a><br><br>Check out or update participant bios:<br><a href="http://www.members.re-wrenches.org" target="_blank">www.members.re-wrenches.org</a><br><br></div></div></div><br>_______________________________________________<br>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div>William Hoffer <br></div>161 SE Fourth Ave<br><div>P.O. Box 1823<br>White Salmon, WA 98672-1823<br><a href="mailto:bhoffer@sunergyengineeringservices.com" target="_blank">sunengser@gmail.com</a><br><br></div></div></div>
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