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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<br>
<br>
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<p class="MsoNormal" style=""><span class="il"><b style="">Allan</b></span><b
style=""> Sindelar</b><span style="font-size: 10pt;"><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 style="">Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b style="">505 424-1112</b><br>
<a href="http://www.positiveenergysolar.com/" target="_blank">www.positiveenergysolar.com</a></span></p>
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<br>
<br>
Dana Orzel wrote:
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<title>Re: [RE-wrenches] Fw: Evergreen</title>
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<p class="MsoNormal"><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.<o:p></o:p></span></p>
<p class="MsoNormal"><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.<o:p></o:p></span></p>
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<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: rgb(31, 73, 125);">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: rgb(31, 73, 125);">Dana
Orzel</span></p>
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<blockquote cite="mid:000101ca896d$023b6d10$06b24730$@com" type="cite">
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<p class="MsoNormal"><span
style="font-family: "Arial","sans-serif"; color: rgb(31, 73, 125);"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Dana,<o:p></o:p></span></p>
<p class="MsoNormal"><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:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Does this
represent average
annual production, rather than peak seasonal? And is it a grid-tied
system?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Allan<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-size: 11pt; color: rgb(31, 73, 125);">Allan Sindelar<o:p></o:p></span></p>
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