I completely agree with you and the "snail trails" will effect the performance sooner then later, and the manufactures a kicking the can down the road. We are also a small scale 42 watt to 110 watt module manufacture and cracks are something we avoid at all costs. Jerry
On Fri, Jul 17, 2015 at 5:07 AM, Bill Hoffer <suneng...@gmail.com> wrote: > Jerry > > 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. > > Bill Hoffer > > On Thu, Jul 16, 2015 at 10:33 PM, jerrysgarage01 <jerrysgarag...@gmail.com > > wrote: > >> Wrenches >> 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 >> Jerry >> >> >> Sent via the Samsung Galaxy S™ III, an AT&T 4G LTE smartphone >> >> >> -------- Original message -------- >> From: b...@midnitesolar.com >> Date:07/16/2015 4:01 PM (GMT-10:00) >> To: RE-wrenches >> Subject: Re: [RE-wrenches] Trina Module Annual Degradation >> >> >> >> It's too bad that when a module goes to a REAL high degradation, like, >> 100% down to nothing >> before that 25 year "warranty" is up, that it is NOT considered >> degradation and is not covered >> under "warranty". >> >> P.S. This has nothing to do with Trina or any PV company in particular. >> >> boB >> >> On 7/16/2015 6:24 PM, jay wrote: >> > HI Peter, >> > >> > I’ll bite. >> > >> > From the folks I know who deal with multi mega watt systems, are >> seeing less than that level of degradation. >> > >> > That said, the standard module 25 yr warranty to 80% is just on .7% >> year if I have my math correct. >> > >> > jay >> > >> > peltz power >> > >> > >> > >> > >> >> On Jul 16, 2015, at 9:08 AM, Peter Parrish < >> peter.parr...@calsolareng.com> wrote: >> >> >> >> I have recently been in discussion with a company that builds a large >> number >> >> of medium-sized PV ground mount system (30 kW to over 100 kW). They >> claim >> >> that they have been seeing something on the order of 0.7% annual >> degradation >> >> in the output of their systems due to intrinsic degradation in the PV >> >> modules. They also claim that this number is supported by the PV module >> >> manufacturer. Many years ago (2007?) I remember reading a report >> containing >> >> data gathered by NREL that showed the number was about 0.4%, and I >> thought >> >> the number was actually decreasing over time. >> >> >> >> The module in question is the Trina TSM-310 (PA14.8, I believe, if it >> makes >> >> any difference). >> >> >> >> Has anyone read anything recent about annual degradation in general or >> Trina >> >> modules in particular? >> >> >> >> - Peter >> >> >> >> Peter T. Parrish, Ph.D. >> >> President, SolarGnosis >> >> 1107 Fair Oaks Ave. Suite 351 >> >> South Pasadena, CA 91030 >> >> NABCEP Certified PV Installer #031806-26 >> >> (323) 839-6108 >> >> peter...@pobox.com >> >> >> >> >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> >> >> > > > -- > William Hoffer > 161 SE Fourth Ave > P.O. Box 1823 > White Salmon, WA 98672-1823 > suneng...@gmail.com <bhof...@sunergyengineeringservices.com> > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > >
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