Mike, Have you read the Enphase white paper on module to inverter size? It goes into good detail on why they do it.
http://www2.enphase.com/global/files/Enphase_White_Paper_Module_Rightsizing.pdf Thanks, Will -- *Will White* Curriculum Developer e: w...@solarenergy.org w: www.solarenergy.org p: 802-272-3092 PV Installation Professional # 093006-34 On Mon, Oct 3, 2016 at 10:20 PM, Mike Kocsmiersky <mi...@spiritsolar.net> wrote: > Recently I’ve been concerned about power clipping of micro inverters and > the design ratio of PV STC array size to inverter. If I have a 300W module > going into a 250W micro inverter, there will be times when the potential > power output is clipped because the micro inverter can’t handle all the > power. I’m thinking cold day with 1000W/m2 irradiance. It is typical > nowadays to have an STC array size to inverter ratio of 1.2. Have you seen > any analysis on how much energy is clipped, vs how much energy output is > increased by operating at a better efficiency spot on the micro inverter? > This assumes that the micro inverter performs better when more fully loaded. > > Additionally over time the crystalline silicon module will degrade > slightly as well, reducing the amount of power clipping. > > > > I welcome your thoughts. > > > > > > Mike Kocsmiersky > > Principal > > Phone: 413 883-3144 > > *Spirit Solar* > > www.SpiritSolar.net > > > > > > _______________________________________________ > 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 > > > -- *Will White* Curriculum Developer e: w...@solarenergy.org w: www.solarenergy.org p: 802-272-3092 PV Installation Professional # 093006-34
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