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
