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<DIV><SPAN class=750543815-31072011><FONT face=Arial color=#0000ff size=2>If you
start fiddling with the geometry for this, it quickly becomes apparent that it
is a messy business with marginal returns - which explains why nobody does it.
</FONT></SPAN></DIV>
<P><FONT size=2>Nick Pyner<BR><BR>Dee Why NSW </FONT></P>
<BLOCKQUOTE>
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
greenbuilding-bounces@lists.bioenergylists.org
[mailto:greenbuilding-bounces@lists.bioenergylists.org]<B>On Behalf Of
</B>Clarke Olsen<BR><B>Sent:</B> Monday, 1 August 2011 1:24 AM<BR><B>To:</B>
Green Building<BR><B>Subject:</B> Re: [Greenbuilding] PV
tracking...<BR><BR></FONT></DIV>Could the addition of reflectors improve
performance, catching the angled incidence?<BR>
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<DIV>Clarke Olsen</DIV>
<DIV>373 route 203</DIV>
<DIV>Spencertown, NY 12165 </DIV>
<DIV>USA</DIV>
<DIV>518-392-4640</DIV>
<DIV><A href="mailto:colsen@fairpoint.net">colsen@fairpoint.net</A></DIV>
<DIV><BR></DIV></SPAN><BR class=Apple-interchange-newline></SPAN><BR
class=Apple-interchange-newline></SPAN></DIV><BR>
<DIV>
<DIV>On Jul 31, 2011, at 12:49 AM, Gordon Howell -- Howell Mayhew Engineering
wrote:</DIV><BR class=Apple-interchange-newline>
<BLOCKQUOTE type="cite">It appears that <U>typically</U> no solar PV
tracking system is economically worthwhile. This arises because you
can install additional fixed-tilt solar PV modules to equal the same amount
of annual energy as the tracking system provides, yet the additional modules
cost less than the tracking system's costs.<BR><BR>This has been apparent
for several years, and with the significant drop in PV module pricing the
difference is even greater today.<BR><BR>There may be applications where a
single-axis tracker is indeed worthwhile, if it is designed and constructed
in a very simple manner, such as in an off-grid system.<BR><BR>I'd be
interested in readers' comments on their own experience.<BR><BR>+Gordon
Howell<BR>Edmonton<BR><BR><BR><BR><BR>
<BLOCKQUOTE class=cite cite="" type="cite"><BR></BLOCKQUOTE>
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