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<title>Re: [RE-wrenches] Fw: Evergreen</title>
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<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:windowtext'>Dave,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:windowtext'>That
is a good a point that we have mulled over. Here in CO we get a monsoon in
summer that it will be clear in the AM and build up to showers and then clear at
sunset. This would not validate the tracker all by itself but it does allow for
max output while the sun shines. Lack of space could be part of the issue for a
tracker decision over fixed too. And then there are clients who just got to
have the tracker, no arguments there. <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'>One
comment from my neighbors is that the fixed arrays and the flat plates do reflect
in their windows a couple of times a year in spring and again in fall but never
a complaint from the tracker as the azimuth and elevation are perfect all the
time.<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:#4F81BD'>Dana
Orzel<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>Great
Solar Works, Inc<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>www.solarwork.com<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>E
- dana@solarwork.com<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>V
- 970.626.5253<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>F
- 970.626.4140<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>C
- 970.209.4076<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#4F81BD'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>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:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>David
Katz<br>
<b>Sent:</b> Sunday, January 03, 2010 12:35 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:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'>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<o:p></o:p></p>
<div>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif"'>David Katz</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif"'>Chief Technical Officer</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif"'>AEE Solar</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif"'>1155 Redway Drive</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif"'>P.O. Box 339</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif"'>Redway, CA 95560</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif"'>Tel (707) 825-1200</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif"'>Fax (707) 825-1202</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif"'><a href="mailto:david@aeesolar.com">dkatz@aeesolar.com</a></span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif"'><a href="http://www.aeesolar.com/">www.aeesolar.com</a></span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:8.0pt;
font-family:"Verdana","sans-serif"'>DISCLAIMER: <br>
This communication, along with any documents, files or attachments, is intended
for the use of only the addressee and contains privileged and confidential
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notified that any dissemination, distribution or copying of any information
contained in or attached to this communication is strictly prohibited. If
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without reading, printing or saving in any manner.</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-left:.5in'><br>
<br>
Dana wrote: <o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif";
color:windowtext'>You got it!</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif";
color:windowtext'> </span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><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.</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif";
color:windowtext'> </span><o:p></o:p></p>
<div>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif";
color:#4F81BD'>Dana Orzel</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif";
color:#4F81BD'> </span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif";
color:#4F81BD'>Great Solar Works, Inc</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif";
color:#4F81BD'><a href="http://www.solarwork.com">www.solarwork.com</a></span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif";
color:#4F81BD'>E - <a href="mailto:dana@solarwork.com">dana@solarwork.com</a></span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif";
color:#4F81BD'>V - 970.626.5253</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif";
color:#4F81BD'>F - 970.626.4140</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif";
color:#4F81BD'>C - 970.209.4076</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#4F81BD'> </span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif";
color:#4F81BD'>I will be the shift in how the world uses power! - Dana Orzel</span><o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-left:.5in'><span style='font-family:"Arial","sans-serif";
color:windowtext'> </span><o:p></o:p></p>
<div>
<div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;
border-color:-moz-use-text-color -moz-use-text-color'>
<p class=MsoNormal style='margin-left:1.0in'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> <a
href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a 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</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal style='margin-left:1.0in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:1.0in'>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:1.0in'><span class=il><b>Allan</b></span><b>
Sindelar</b><span style='font-size:10.0pt'><br>
<a 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 href="http://www.positiveenergysolar.com/" target="_blank">www.positiveenergysolar.com</a></span><o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-left:1.0in'><br>
<br>
Dana Orzel wrote: <o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:14.0pt;
font-family:"Arial","sans-serif";color:#1F497D'>This is for a grid tied with
battery backup Outback system.</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:14.0pt;
font-family:"Arial","sans-serif";color:#1F497D'>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:1.0in'><span style='font-family:"Arial","sans-serif";
color:#1F497D'>Thanks,</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-family:"Arial","sans-serif";
color:#1F497D'>Dana Orzel</span><o:p></o:p></p>
</div>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal style='margin-left:1.0in'><span style='color:#1F497D'>Dana,</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='color:#1F497D'>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:1.0in'><span style='color:#1F497D'>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:1.0in'><span style='color:#1F497D'>Thanks,</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='color:#1F497D'>Allan</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='color:#1F497D'> </span><o:p></o:p></p>
<div>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
color:#1F497D'>Allan Sindelar</span><o:p></o:p></p>
</div>
</blockquote>
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