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<DIV><FONT face=Calibri>Allan,</FONT></DIV>
<DIV><FONT face=Calibri>According to Unirac tech, the code manual only addresses
solid wall structures. He was also the one who told me about the greater
windloads on open structures. His suggestion was to get an engineer
involved, but on a system this size I am hoping to avoid that additional cost. I
did fill out their online design parameter form, so I'm hoping to get enough
feedback from that to come up with an over-engineered way to anchor the array to
the frame structure of the carport..........</FONT></DIV>
<DIV>Holt E. Kelly<BR>Holtek Fireplace & Solar Products<BR>500 Jewell
Dr.<BR>Waco TX. 76712<BR>254-751-9111<BR><A
href="http://www.holteksolar.com">www.holteksolar.com</A><BR></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=allan@positiveenergysolar.com
href="mailto:allan@positiveenergysolar.com">Allan Sindelar</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=re-wrenches@lists.re-wrenches.org
href="mailto:re-wrenches@lists.re-wrenches.org">RE-wrenches</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, April 18, 2010 2:17
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [RE-wrenches] Tilt
biased....</DIV>
<DIV><BR></DIV>Holt,<BR>Feedback re the low tilt angle: Go for it, you're
good.<BR><BR>Re wind loading: check out UniRac's Code Compliant Installation
Manual, <A class=moz-txt-link-freetext
href="http://www.unirac.com/pdf/ii227.pdf">http://www.unirac.com/pdf/ii227.pdf</A>,
especially pages 3-9.<BR><BR>Less wind loading is one of the main reasons for
going with a lower tilt angle. Another is closer module row spacing (at 3X
height RoT) without inter-row shading.<BR><BR>No experience with
Enphase.<BR>Allan<BR><BR>
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<P class=MsoNormal><SPAN class=il><B>Allan</B></SPAN><B> 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>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></P></DIV></DIV><BR><BR><A
class=moz-txt-link-abbreviated
href="mailto:holtek@sbcglobal.net">holtek@sbcglobal.net</A> wrote:
<BLOCKQUOTE cite=mid:50CF01023BB74DA1948CA536CE327489@HoltPC type="cite">
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<DIV><FONT face=Calibri>Searching for opinions.....is this "over
design"?</FONT></DIV>
<DIV><FONT face=Calibri>Designing small system (2.35kW). Customer uses gas
for heating. Typical A/C unit. I was thinking of biasing the tilt to summer
production for greater offset of summer demand (lat
31.6, proposing 18). No net metering in this part of the world.
PVwatts shows a drop of 2% /yr. in production , 5% higher
production for A/C months. Feedback?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Calibri> Also, this array will go on a carport. I
understand that windloading is actually greater for an open structure than
one with walls (another reason for lower tilt) - is there any one that can
direct me to data on finding out how much more? </FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Calibri>Lastly, what is a good avg. target derate factor for
Enphase inverters (real world)?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>Holt E. Kelly<BR>Holtek Fireplace & Solar
Products<BR>500 Jewell Dr.<BR>Waco TX. 76712<BR>254-751-9111<BR><A
href="http://www.holteksolar.com"
moz-do-not-send="true">www.holteksolar.com</A></FONT></DIV><PRE wrap=""><HR width="90%" SIZE=4>
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