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Mike,<br>
Why do you make this exception, please?<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>
On 7/22/2010 2:12 PM, Michael Kelly wrote:
<blockquote cite="mid:00e201cb29da$40a7a8d0$c1f6fa70$@com"
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<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif";">Hi
All,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif";"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif";">I
agree with Ray with the exception that I use Imp*1.25 in my
calculations.
I developed a simple spreadsheet for either fixed conductor
size or for fixed
voltage drop. You can feel free to use it by downloading
here: <a moz-do-not-send="true"
href="http://www.mechanicalmike.com/solar/DC_Voltage_Drop_Calculations_Template_04_20_2010.xltx">http://www.mechanicalmike.com/solar/DC_Voltage_Drop_Calculations_Template_04_20_2010.xltx</a>.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif";"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif";">-
Mike<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-size: 11pt;
font-family: "Calibri","sans-serif";">---<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt;
font-family: "Calibri","sans-serif";">Michael
Kelly<br>
Applications Engineer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt;
font-family: "Calibri","sans-serif";">NABCEP
Certified
Solar PV Installer ™<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt;
font-family: "Calibri","sans-serif";"><img
id="Picture_x0020_1"
src="cid:part1.07000004.08000303@positiveenergysolar.com"
alt="toplogo" width="150" border="0" height="36"><br>
Solectria Renewables, LLC<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt;
font-family: "Calibri","sans-serif";">360
Merrimack
St.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt;
font-family: "Calibri","sans-serif";">Building
9,
Floor 2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt;
font-family: "Calibri","sans-serif";">Lawrence,
MA
01843<br>
Phone: 978-683-9700 ext. 167<br>
Fax: 978-683-9702<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt;
font-family: "Calibri","sans-serif";"><a
moz-do-not-send="true" href="mailto:mike@solren.com">mike@solren.com</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt;
font-family: "Calibri","sans-serif";"><a
moz-do-not-send="true" href="http://www.solren.com/">www.solren.com</a><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif";"><o:p> </o:p></span></p>
<div>
<div style="border-right: medium none; border-width: 1pt
medium medium; border-style: solid none none; border-color:
rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color;
padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span style="font-size: 10pt;
font-family:
"Tahoma","sans-serif";">From:</span></b><span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";">
<a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On
Behalf Of </b>R Ray
Walters<br>
<b>Sent:</b> Thursday, July 22, 2010 3:45 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] calculating DC voltage
drop<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I use actual operating current, without
multipliers. I also
use actual temperatures, not the worst case temperatures that
many use.<o:p></o:p></p>
<div>
<p class="MsoNormal">I created a spread sheet that uses the
NEC adjustments for
wire temperature, (see NEC chapter 9, table 8, FPN 2)<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">It makes quite a difference!<o:p></o:p></p>
<div>
<p class="MsoNormal">Volt drop and the accompanying loss of
energy production
needs to be looked at realistically under normal operating
conditions. Adding
worst case multipliers is necessary for sizing cables and
breakers for safety,
but it isn't appropriate when calculating energy losses.
We shouldn't do an
energy loss analysis for a situation that might never
occur, or for only a very
small % of the time. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">A correct analysis will reflect actual
losses over the
lifetime of the system, so that an informed economic
decision can be made.
Especially on larger systems with long runs, its worth it
to you and the client
to use real world numbers, not blind over sizing.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">I got into this over a decade ago, when
I noticed that
actual measured volt drop was much less than calculated,
now my calculations
match real measurements. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal"><span style="font-size: 9pt;
font-family:
"Helvetica","sans-serif"; color:
black;">R. Walters<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size: 9pt;
font-family:
"Helvetica","sans-serif"; color:
black;"><a moz-do-not-send="true"
href="mailto:ray@solarray.com">ray@solarray.com</a><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size: 9pt;
font-family:
"Helvetica","sans-serif"; color:
black;">Solar Engineer<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size: 9pt;
font-family:
"Helvetica","sans-serif"; color:
black;"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size: 9pt;
font-family:
"Helvetica","sans-serif"; color:
black;"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-size: 9pt;
font-family:
"Helvetica","sans-serif"; color:
black;"><br>
<br>
</span><o:p></o:p></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">On Jul 22, 2010, at 1:22 PM, Marco
Mangelsdorf wrote:<o:p></o:p></p>
</div>
<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
<div>
<div>
<p class="MsoNormal"><span style="font-size: 11pt;
font-family:
"Calibri","sans-serif";">When
calculating the voltage drop from a PV array to
the inverter, what’s the
most common accepted practice? To use the Isc X
1.25 or 1.56 as the
multiplier?<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size: 11pt;
font-family:
"Calibri","sans-serif";"> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size: 11pt;
font-family:
"Calibri","sans-serif";">Thanks,<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size: 11pt;
font-family:
"Calibri","sans-serif";">marco<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size: 11pt;
font-family:
"Calibri","sans-serif";"> <o:p></o:p></span></p>
</div>
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