This jester must ask, with a hint of glee... is this off the grid, or is there u-til-i-tee?
Mick Abraham, Proprietor www.abrahamsolar.com Voice: 970-731-4675 On Wed, Oct 28, 2009 at 5:29 PM, Matt Lafferty <gilliga...@gmail.com> wrote: > Esteemed Wrenches, > > Your collective wisdom & conjecture is sought in resolving the following > riddle: > > There once was a home in the hills. > With morning sun the roof is filled. > Blasted mountain rising in the west, > Makes a shady mess at very best. > ** > *"Onward! Fear not!*",* *sayeth the man. > *"Twenty-four modules. Not one less!"* > *"Black box of magic for every one."* > *"And string inverter plus Island of Sun!"* > > With fifty-one hundred watts of DC. > Two series strings of four times three. > Black boxes of magic, but not by that name. > At quarter the price are they really the same? > 'Tis not the matter, least not today. > To you the group... What do you say? > > For greatest performance over time to yield... > 2 balanced strings of shade and of sun, > Or put worst shade all onto one? > Snake-oil merchants say not to worry. > Magical boxes change dark to light in a hurry. > What say ye, from out in the field? > Balance the strings, or not? > <End> > > Some factors to consider.... The site is shade-challenged, primarily in the > afternoon. There will be two strings of 12 modules each feeding a single > inverter. Enphase is off the table for now. Homeowner specifically wants > to do back-of-module DC shade mitigation. The array layout is such that > configuring the strings so there is a dominant sunny one and dominant shady > one is possible. It is also possible and almost as easy to configure the > strings so they are more balanced with each other. Assuming that each module > is equipped with a black box, will it make any difference which > configuration gets used? > > I have my theory on the subject and am interested in yours. Thanks in > advance for any and all feedback. > > Pray for Sun! > > _______________________________________________ > 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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