<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 12 (filtered medium)">
<!--[if !mso]>
<style>
v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style>
<![endif]-->
<title>Re: [RE-wrenches] Fw: Evergreen</title>
<style>
<!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:Verdana;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:Consolas;
panose-1:2 11 6 9 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";
color:black;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p
{mso-style-priority:99;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:12.0pt;
font-family:"Times New Roman","serif";
color:black;}
pre
{mso-style-priority:99;
mso-style-link:"HTML Preformatted Char";
margin:0in;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";
color:black;}
span.HTMLPreformattedChar
{mso-style-name:"HTML Preformatted Char";
mso-style-priority:99;
mso-style-link:"HTML Preformatted";
font-family:Consolas;}
span.il
{mso-style-name:il;}
span.EmailStyle21
{mso-style-type:personal;
font-family:"Arial","sans-serif";
color:windowtext;
font-weight:normal;
font-style:normal;}
span.EmailStyle22
{mso-style-type:personal;
font-family:"Times New Roman","serif";
color:#1F497D;
font-weight:normal;
font-style:normal;
text-decoration:none none;}
span.EmailStyle23
{mso-style-type:personal;
font-family:"Arial","sans-serif";
color:#1F497D;
font-weight:normal;
font-style:normal;}
span.EmailStyle24
{mso-style-type:personal;
font-family:"Arial","sans-serif";
color:windowtext;
font-weight:normal;
font-style:normal;}
span.EmailStyle25
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
/* Page Definitions */
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.Section1
{page:Section1;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body bgcolor=white lang=EN-US link=blue vlink=purple>
<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I’m with you on this one David. 15 years ago (when
PV cost about 3 times as much as today) I was a great believer in tracking mounts,
and I’m sorry to say I sold a lot of Wattsun and Zomeworks mounts.
But after experiencing almost yearly repairs to every Wattsun, and watching
folks tie down their Zomeworks so they didn’t get blown to the western
stop every afternoon, I gradually became less enthusiastic. With the
price of PV now, I can’t make any kind of financial case for the purchase
of a mounting structure that’s sure to cause service callbacks for
dealers. Save yourself the callbacks from clients. You want more
watthours? Just put a few more modules on a fixed rack and never have to
think about it again!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Cheers,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Doug Pratt<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Technical Support<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>DC Power Systems <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><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><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 11:35 AM<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><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>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><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>David
Katz</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Chief
Technical Officer</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>AEE
Solar</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>1155
Redway Drive</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>P.O.
Box 339</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Redway,
CA 95560</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Tel
(707) 825-1200</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Fax
(707) 825-1202</span><o:p></o:p></p>
<p class=MsoNormal><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><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><span style='font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal><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
information. If you are not the intended recipient, you are hereby
notified that any dissemination, distribution or copying of any information
contained in or attached to this communication is strictly prohibited. If
you have received this message in error, please notify the sender immediately
by e-mail reply and destroy the original communication and its attachments
without reading, printing or saving in any manner.</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
</div>
<p class=MsoNormal><br>
<br>
Dana wrote: <o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:windowtext'>You
got it!</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:windowtext'> </span><o:p></o:p></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.</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:windowtext'> </span><o:p></o:p></p>
<div>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>Dana
Orzel</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>Great
Solar Works, Inc</span><o:p></o:p></p>
<p class=MsoNormal><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><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><span style='font-family:"Arial","sans-serif";color:#4F81BD'>V
- 970.626.5253</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>F
- 970.626.4140</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#4F81BD'>C
- 970.209.4076</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#4F81BD'> </span><o:p></o:p></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</span><o:p></o:p></p>
</div>
<p class=MsoNormal><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:.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'> <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:.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'>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:.5in'><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:.5in'><br>
<br>
Dana Orzel wrote: <o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><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:.5in'><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:.5in'><span style='font-family:"Arial","sans-serif";
color:#1F497D'>Thanks,</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><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:.5in'><span style='color:#1F497D'>Dana,</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><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:.5in'><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:.5in'><span style='color:#1F497D'>Thanks,</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='color:#1F497D'>Allan</span><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='color:#1F497D'> </span><o:p></o:p></p>
<div>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
color:#1F497D'>Allan Sindelar</span><o:p></o:p></p>
</div>
</blockquote>
<p style='margin-left:.5in'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:windowtext'>No virus found in this incoming message.<br>
Checked by AVG - <a href="http://www.avg.com">www.avg.com</a><br>
Version: 9.0.725 / Virus Database: 270.14.124/2596 - Release Date: 01/01/10
02:20:00</span><o:p></o:p></p>
<pre><o:p> </o:p></pre><pre style='text-align:center'>
<hr size=4 width="90%" align=center>
</pre><pre><o:p> </o:p></pre><pre>_______________________________________________<o:p></o:p></pre><pre>List sponsored by Home Power magazine<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>List Address: <a
href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Options & settings:<o:p></o:p></pre><pre><a
href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>List-Archive: <a
href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>List rules & etiquette:<o:p></o:p></pre><pre><a
href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Check out participant bios:<o:p></o:p></pre><pre><a
href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre> <o:p></o:p></pre></div>
</body>
</html>