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Since modules are getting so inexpensive, the big questions is what is
the best way to get 33% more power? Is it better to use 33% more
modules on a fixed array, or use a tracker? Which one costs less? It
costs $1.50 to $2.00 per watt for a tracker. If modules cost $3 per
watt and a fixed mount costs $.040 per watt , 33% of $3.40 per watt is
$1.12 per watt. And trackers don't come with a 25 year power output
warranty. I see tackers making sense when the array is powering a
centrifugal pump in the summer or possible a time-of-use grid tie that
pays more in the summer. You are definitely better off with more
modules on a fixed array in an off grid situation because you always
need more power in the winter when the tracker is least effective.<br>
David<br>
<br>
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<p class="MsoNormal" style=""><span
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<p class="MsoNormal" style=""><span
style="font-size: 10pt; font-family: Verdana;">Chief Technical Officer</span><span
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<p class="MsoNormal" style=""><span
style="font-size: 10pt; font-family: Verdana;">AEE Solar</span><span
style="font-family: Arial;"><o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 10pt; font-family: Verdana;">1155 <span
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style="font-size: 10pt; font-family: Verdana;">P.O. Box 339</span><span
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style="font-size: 10pt; font-family: Verdana;">Redway</span></span><span
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CA 95560</span><span style="font-family: Arial;"><o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
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<br>
<br>
Dana wrote:
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<title>Re: [RE-wrenches] Fw: Evergreen</title>
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<div class="Section1">
<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: windowtext;">You
got it!<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: windowtext;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: windowtext;">It
boggles my mind to watch the two OB FM60s and see the difference each
day and
then to go back and see the data over time. It is a very good argument
for
tracking. We have a Durango client that we installed 12 KW GIT tracked
and it
is outperforming the expectations of our client too.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: windowtext;"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: rgb(79, 129, 189);">Dana
Orzel<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: rgb(79, 129, 189);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: rgb(79, 129, 189);">Great
Solar Works, Inc<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: rgb(79, 129, 189);"><a class="moz-txt-link-abbreviated" href="http://www.solarwork.com">www.solarwork.com</a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: rgb(79, 129, 189);">E
- <a class="moz-txt-link-abbreviated" href="mailto:dana@solarwork.com">dana@solarwork.com</a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: rgb(79, 129, 189);">V
- 970.626.5253<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: rgb(79, 129, 189);">F
- 970.626.4140<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: rgb(79, 129, 189);">C
- 970.209.4076<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(79, 129, 189);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: rgb(79, 129, 189);">I
will be the shift in how the world uses power! - Dana Orzel<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: windowtext;"><o:p> </o:p></span></p>
<div>
<div
style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal" style="margin-left: 0.5in;"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">
<a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Allan
Sindelar<br>
<b>Sent:</b> Thursday, December 31, 2009 8:13 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Evergreen<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal" style="margin-left: 0.5in;"><o:p> </o:p></p>
<p class="MsoNormal"
style="margin-right: 0in; margin-bottom: 12pt; margin-left: 0.5in;">Dana,<br>
Thank you for this information. I would like to clarify what you wrote.
We have
long accepted that trackers may be expected to increase daily output by
about
35-40% in the summer and 10-15% in the winter, due to the differences
in the
sun's seasonal elevation and the resultant length of the solar day. It
sounds
as if you measured the effective increase from approximately summer
solstice -
winter solstice and got a 32% gain. You previously got the same gain
(33%)
measuring from last winter solstice to summer solstice. This makes
sense, as it
averages winter and summer gains over two roughly equal periods, with
variations (summer monsoons, etc.) being within acceptable error. <br>
And whether grid-tied, grid-tied with backup, or off-grid is irrelevant
as long
as you can compare and record the outputs of the two otherwise
identical
arrays, one tracked and one fixed.<br>
Do I understand this right? If so, it's good real-world data for design
purposes.<br>
Allan<o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-left: 0.5in;"><span class="il"><b>Allan</b></span><b>
Sindelar</b><span style="font-size: 10pt;"><br>
<a moz-do-not-send="true" href="mailto:Allan@positiveenergysolar.com"
target="_blank"><span class="il">Allan</span>@positiveenergysolar.com</a><br>
NABCEP Certified Photovoltaic Installer<br>
EE98J Journeyman Electrician<br>
<b>Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b>505 424-1112</b><br>
<a moz-do-not-send="true" href="http://www.positiveenergysolar.com/"
target="_blank">www.positiveenergysolar.com</a></span><o:p></o:p></p>
</div>
<p class="MsoNormal" style="margin-left: 0.5in;"><br>
<br>
Dana Orzel wrote: <o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 0.5in;"><span
style="font-size: 14pt; font-family: "Arial","sans-serif"; color: rgb(31, 73, 125);">This
is for a grid tied with
battery backup Outback system.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 0.5in;"><span
style="font-size: 14pt; font-family: "Arial","sans-serif"; color: rgb(31, 73, 125);">The
32% increased gain for the
tracker VS. fixed mount production is an average of the last 180 days
and I
checked it in the spring for the last 180 days [over the winter] and it
was
33%. The 12 – Evergreen 180 watt modules produce about 65 -70% of our
home and office’s electrical requirements.</span><o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-left: 0.5in;"><span
style="font-family: "Arial","sans-serif"; color: rgb(31, 73, 125);">Thanks,</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 0.5in;"><span
style="font-family: "Arial","sans-serif"; color: rgb(31, 73, 125);">Dana
Orzel</span><o:p></o:p></p>
</div>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<p class="MsoNormal" style="margin-left: 0.5in;"><span
style="color: rgb(31, 73, 125);">Dana,</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 0.5in;"><span
style="color: rgb(31, 73, 125);">That
32% is a very useful number, and it matches with our experience as
well. But I
need to verify a couple of assumptions, please:</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 0.5in;"><span
style="color: rgb(31, 73, 125);">Does
this represent average annual production, rather than peak seasonal?
And is it
a grid-tied system?</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 0.5in;"><span
style="color: rgb(31, 73, 125);">Thanks,</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 0.5in;"><span
style="color: rgb(31, 73, 125);">Allan</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 0.5in;"><span
style="color: rgb(31, 73, 125);"> </span><o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-left: 0.5in;"><span
style="font-size: 11pt; color: rgb(31, 73, 125);">Allan Sindelar</span><o:p></o:p></p>
</div>
</blockquote>
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