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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I have seen 1360 w/m² when cloud edge effect took over. We usually
measure 1100 to 1150 w/m² on a cold clear day here in Truckee.<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:10.0pt;font-family:"Calibri","sans-serif";
color:navy'>Sincerely,<br>
<br>
Chris Worcester<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:navy'>Solar Wind Works<br>
NABCEP Certified PV Installer<br>
Phone: 530-582-4503<br>
Fax: 530-582-4603<br>
<a href="http://www.solarwindworks.com/"><u><span style='color:blue'>www.solarwindworks.com</span></u></a><br>
<a href="mailto:chris@solarwindworks.com"><u><span style='color:blue'>chris@solarwindworks.com</span></u></a><br>
"Proven Energy Solutions"</span><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'><o:p> </o:p></span></p>
<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"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Darryl
Thayer<br>
<b>Sent:</b> Friday, April 02, 2010 10:35 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] DC wire sizing<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Erika<br>
you are correct, the solar radiance can exceed STC by about 125%, any one who
has spent any time with a pyrometer has observed this. From
experience's continuously operated circuits fail fasted
than intermittent circuits. for the temperature and conduit fill,
they are valid of course, but solar are not overcurrent protected, it is
possible to have a solar circuit be shorted and stay sorted for months or
even a year. If this happens it is still hoped that the system will not
cause a fire.<br>
<br>
Darryl <br>
<br>
--- On <b>Fri, 4/2/10, Bill Brooks <i><billbrooks7@yahoo.com></i></b>
wrote:<o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
From: Bill Brooks <billbrooks7@yahoo.com><br>
Subject: Re: [RE-wrenches] DC wire sizing<br>
To: erika@repowersolutions.com, "'RE-wrenches'"
<re-wrenches@lists.re-wrenches.org><br>
Date: Friday, April 2, 2010, 11:14 AM<o:p></o:p></p>
<div id=yiv395786165>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Erika,</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>The
most correct answer (which is a really funny thing to say) is to use John
Wiles’ “5-step program”—that’s what I call it. It is published in one of the
appendices of his latest “Suggested Practices” document. If you can actually
follow what he leads you through (that’s why I call it the 5-Step program),
it will lead you to the correct answer.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>My
short answer, that can result in a larger than necessary conductor, is to
determine the required overcurrent protection device (OCPD) rating and then
size the conductor accordingly. The reason it may be conservative is that the
NEC allows you to round to the next larger standard OCPD in 240.4(B). This is
the way all conductors are sized in the electrical industry. I’m all about
simplicity and being a little conservative is always better than being overly
liberal (I’m not making a political statement here, but if the shoe fits…).</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Bill.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
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border-color:-moz-use-text-color -moz-use-text-color'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org]
<b>On Behalf Of </b>Erika M. Weliczko<br>
<b>Sent:</b> Friday, April 02, 2010 6:27 AM<br>
<b>To:</b> 'RE-wrenches'<br>
<b>Subject:</b> [RE-wrenches] DC wire sizing</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>To my understanding
the 156% on PV source and output circuits is related to the ability of PV to
deliver more than rated and be continuous.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Therefore, the wire
has to be able to carry this current, so now the temperature and fill
corrections are applied to find the wire capable of the 156%.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I am in a debate
where the question is why correct for temp and fill on 156% of ISC and spend
all that extra money when the normal operating is at Imp. Or why correct the
156% but why not correct the Isc or Imp.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I am going to stick
to the fact that the circuit has to carry the 156% under all conditions…</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thoughts? </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Erika</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
-----Inline Attachment Follows-----<o:p></o:p></p>
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