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<DIV dir=ltr align=left><SPAN class=635525900-21122006><FONT face=Arial
color=#0000ff size=2>Brian,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=635525900-21122006><FONT face=Arial
color=#0000ff size=2>PV Watts assumes several variables which are constant. I am
also a rep for PowerLight, who has installed the largest solar systems in the
world, out of Berkeley, California. PowerLight uses their own
simulation program based originally on PV Watts but more detailed to more
accurately predict solar performance. Their estimated energy output is also
usually lower than PV Watts predicted values since they often have to guarantee
performance over 20+ years. We also do have a solar specialist in house
who writes his own hourly simulation programs for solar, wind and
distributed generation systems.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=635525900-21122006><FONT face=Arial
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<P class=MsoNormal><STRONG><SPAN
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<P class=MsoNormal><STRONG><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Renée <SPAN
class=SpellE>Azerbegi</SPAN>, CEM, LEED-AP<o:p></o:p></SPAN></STRONG></P>
<P class=MsoNormal><SPAN class=GramE><STRONG><SPAN
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style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial"> 303.278.1532 | f
303.278.8533 | c 303.885.2695 | </SPAN></STRONG><STRONG><SPAN
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<FONT face=Tahoma size=2><B>From:</B> bldg-sim@gard.com
[mailto:bldg-sim@gard.com] <B>On Behalf Of </B>Brian Thornton<BR><B>Sent:</B>
Tuesday, December 19, 2006 10:28 AM<BR><B>To:</B>
bldg-sim@gard.com<BR><B>Subject:</B> [bldg-sim] photovoltaic output in DOE-2 and
PV Watts<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I am simulating a 28.1 kW array in
DOE-2 (eQuest 3.6) and in PV Watts. The array is flat, on a rooftop with
150 Sanyo 195 modules, and 6 PVPowered 4800W
inverters.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">DOE-2 gives results with 20,600 kWh
annual AC production using the standard model
methodology.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">PV Watts gives about 25,000 kWh
annual AC production. Solar designers in <st1:City w:st="on"><st1:place
w:st="on">Portland</st1:place></st1:City> support this higher value from actual
building results.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Can anyone share experience with
DOE-2 modeled PV output vs. PV Watts, or offer any suggestions on variables of
primary concern in the DOE-2 input?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">If anyone is truly expert on
modeling solar PV in DOE-2, and can validate results with other calculation
tools,<U> I would be interested in hiring you </U>for some limited consulting.
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Brian Thornton,
PE<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoAutoSig><st1:City w:st="on"><st1:place w:st="on"><FONT face=Arial
size=2><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial">Thornton</SPAN></FONT></st1:place></st1:City><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Arial"> Energy
Consulting<o:p></o:p></SPAN></FONT></P>
<P class=MsoAutoSig><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial">p. 503-231-6600 f.
503-231-3555<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText><st1:PersonName w:st="on"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial">thorntonenergy@comcast.net</SPAN></FONT></st1:PersonName><FONT
face=Arial size=2><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P></DIV><PRE>
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