This jester must ask, with a hint of glee...<br>is this off the grid, or is there u-til-i-tee?<br><br clear="all">Mick Abraham, Proprietor<br><a href="http://www.abrahamsolar.com">www.abrahamsolar.com</a><br><br>Voice: 970-731-4675<br>
<br><br><div class="gmail_quote">On Wed, Oct 28, 2009 at 5:29 PM, Matt Lafferty <span dir="ltr"><<a href="mailto:gilligan06@gmail.com">gilligan06@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>
<div><font size="2" face="Arial"><span>Esteemed
Wrenches,</span></font></div>
<div><font size="2" face="Arial"><span></span></font> </div>
<div><font size="2" face="Arial"><span>Your collective
wisdom & conjecture is sought in resolving the following
riddle:</span></font></div>
<div><font size="2" face="Arial"><span></span></font> </div>
<div><font size="2" face="Arial"><span>There once was a
home in the hills.</span></font></div>
<div><font size="2" face="Arial"><span>With morning sun the
roof is filled.</span></font></div>
<div><font size="2" face="Arial"><span>Blasted mountain
rising in the west,</span></font></div>
<div><font size="2" face="Arial"><span>Makes a shady mess
at very best.</span></font></div>
<div><font size="2" face="Arial"><span><i></i></span></font> </div>
<div><font size="2" face="Arial"><span><i>"Onward! Fear
not!</i>",<i> </i>sayeth the man.</span></font></div>
<div><font size="2" face="Arial"><span><i>"Twenty-four
modules. Not one less!"</i></span></font></div>
<div><font size="2" face="Arial"><span><i>"Black box of
magic for every one."</i></span></font></div>
<div><font size="2" face="Arial"><span>
<div><font size="2" face="Arial"><span><i>"And string
inverter plus Island of Sun!"</i></span></font></div>
<div><font size="2" face="Arial"><span></span></font> </div>
<div><font size="2" face="Arial"><span>With fifty-one
hundred watts of DC.</span></font></div>
<div><font size="2" face="Arial"><span>Two series strings
of four times three.</span></font></div>
<div><font size="2" face="Arial"><span>Black boxes of
magic, but not by that name.</span></font></div>
<div><font size="2" face="Arial"><span>At quarter the price
are they really the same?</span></font></div>
<div><font size="2" face="Arial"><span>
<div><font size="2" face="Arial"><span>'Tis not the
matter, least not today.</span></font></div>
<div><font size="2" face="Arial"><span>To you the group...
What do you say?</span></font></div></span></font></div>
<div><font size="2" face="Arial"><span></span></font> </div>
<div><font size="2" face="Arial"><span>For greatest
performance over time to yield...</span></font></div>
<div><font size="2" face="Arial"><span>2 balanced
strings of shade and of sun,</span></font></div>
<div><font size="2" face="Arial"><span>Or put worst
shade all onto one?</span></font></div>
<div><font size="2" face="Arial"><span>Snake-oil merchants
say not to worry.</span></font></div>
<div><font size="2" face="Arial"><span></span></font><font size="2" face="Arial"><span>Magical boxes change dark
to light in a hurry.</span></font></div>
<div><font size="2" face="Arial"><span>What say ye, from
out in the field?</span></font></div>
<div><font size="2" face="Arial"><span>Balance the strings,
or not?</span></font></div>
<div><font size="2" face="Arial"><span><End></span></font></div>
<div><font size="2" face="Arial"><span></span></font> </div>
<div><font size="2" face="Arial"><span>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.
</span></font><font size="2" face="Arial"><span>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?</span></font></div>
<div><font size="2" face="Arial"><span></span></font> </div>
<div><font size="2" face="Arial"><span>I have my theory on
the subject and am interested in yours. <span>Thanks in
advance for any and all feedback. </span></span></font></div>
<div><font size="2" face="Arial"><span><span></span></span></font> </div>
<div><font size="2" face="Arial"><span><span>Pray for
Sun!</span></span></font></div></span></font></div></div>
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