Usually you increase the temperature above ambient by an amount which depends on the mounting method. Close to the roof is +35 degrees C, more than 6 inches above the roof is +30 degrees C, and pole or ground mount is +25 degrees C.
Scott On Nov 29, 2011, at 11:48 AM, Kirk Herander wrote: > I am in debate with a PE over calculation of low voltage of a series string > on a hot day. He insists that an arbitrary high cell temp is factored in, not > just ambient temperature. Could someone please give an accepted formula for > this calculation? Thanks. I cannot find a clear reference to low voltage > calculation on a hot day (but every reference material is clear on how to > calculate high voltage on a cold day). > > Kirk Herander > VT Solar, LLC > dba Vermont Solar Engineering > NABCEPTM Certified installer Charter Member > NYSERDA-eligible Installer > VT RE Incentive Program Partner > > _______________________________________________ > 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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