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<p class=MsoNormal><font size=2 color="#003366" face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:#003366'>Dear wrenches,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#003366" face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:#003366'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#003366" face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:#003366'>We would recommend
the PowerOne inverters with two separate MPPT Tables.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#003366" face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:#003366'>The only thing, they
have to raise the warranty to 10 years.<o:p></o:p></span></font></p>
<p><font size=2 color="#003366" face=Verdana><span lang=EN-US style='font-size:
10.0pt;font-family:Verdana;color:#003366'>Kind regards,</span></font><font
face=Verdana><span lang=EN-US style='font-family:Verdana'><br>
</span></font><font color="#003366" face=Verdana><span lang=EN-US
style='font-family:Verdana;color:#003366'>Wilco Vercoelen<br>
President</span></font><font face=Verdana><span style='font-family:Verdana'><o:p></o:p></span></font></p>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt'><img
width=79 height=42 id="Picture_x0020_0" src="cid:image003.jpg@01CA331A.EE2DB6A0"
alt=new-logo-email.gif></span></font><b><font color="#003366" face=Verdana><span
lang=EN-US style='font-family:Verdana;color:#003366;font-weight:bold'><br>
Dommelvalley Green Power Inc.<br>
Solar Energy Solutions<br>
</span></font></b><font color="#003366" face=Verdana><span lang=EN-US
style='font-family:Verdana;color:#003366'>Utopia, Ontario, Canada<br>
</span></font><font face=Verdana><span style='font-family:Verdana'><a
href="http://www.dommelvalley.ca/"><font color="#003366"><span lang=EN-US
style='color:#003366'>http://www.dommelvalley.ca</span></font></a><br>
T</span></font><font color="#003366" face=Verdana><span lang=EN-US
style='font-family:Verdana;color:#003366'>el. 705-423-9699<br>
Fax. 705-423-9880<br>
Toll Free 1-877-889-7657<br>
</span></font><font size=1 face=Verdana><span lang=EN-US style='font-size:7.5pt;
font-family:Verdana'><br>
This e-mail message is intended only for the person or entity to which it is
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face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Verdana><span style='font-size:
10.0pt;font-family:Verdana;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Verdana><span style='font-size:
10.0pt;font-family:Verdana;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Peter Parrish<br>
<b><span style='font-weight:bold'>Sent:</span></b> September-11-09 19:53<br>
<b><span style='font-weight:bold'>To:</span></b> 'RE-wrenches'<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [RE-wrenches] losses
to competing angles in single strings</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>In principle, two strings
with different orientations should not be wired in parallel into the same
inverter. However, when the mismatch is minor (15 degrees in pitch or 15
degrees in azimuth) there is practically no degradation. Fronius circulated a
white paper for a while that argued that their inverters did maximum power
point tracking on the string with the greatest irradiance and therefore did an
optimum mppt job on the string with the greatest “available
power”. This part of the argument makes sense. What I have never been
clear about is how close to “optimum” this arrangement is (optimum
being two separate monitors one for each string).</span></font><span
lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font><span
lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>Fronius appears to be
backing away from this white paper, as I was told about six months ago from a
member of their tech support staff that they recommended two separate
inverters.</span></font><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font><span
lang=EN-US><o:p></o:p></span></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-US
style='font-size:10.0pt;font-family:Arial;color:navy'>- Peter</span></font><span
lang=EN-US><o:p></o:p></span></p>
<p><font size=2 color=navy face=Arial><span lang=EN-US style='font-size:10.0pt'> <o:p></o:p></span></font></p>
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src="cid:image004.gif@01CA331A.EE2DB6A0" align=left hspace=12 v:shapes="_x0000_s1026"><![endif]><font
size=1 color=navy><span lang=EN-US style='font-size:9.0pt;color:navy'>Peter T.
Parrish, Ph.D., President<br>
California Solar Engineering, Inc.<br>
820 Cynthia Ave., Los Angeles, CA 90065<br>
CA Lic. 854779, NABCEP Cert. 031806-26<br>
<a href="mailto:peter.parrish@calsolareng.com">peter.parrish@calsolareng.com</a>
<br>
Ph 323-258-8883, Mobile 323-839-6108, Fax
323-258-8885
</span></font><span lang=EN-US><o:p></o:p></span></p>
<p><font size=2 color=navy face=Arial><span lang=EN-US style='font-size:10.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Nick Vida<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, September 09,
2009 6:38 PM<br>
<b><span style='font-weight:bold'>To:</span></b> wrenches<br>
<b><span style='font-weight:bold'>Subject:</span></b> [RE-wrenches] losses to
competing angles in single strings</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>hello wrenches.<br>
<br>
I was wondering if any of you have any data on what the losses would be if you
had your string split with 2 different angles, but at the same azimuth. For
instance, string of 11 with 8 facing 180 south at 30 degrees, and 3 facing
south 180 at 45 degrees. I have heard that the voltages and currents would
differ and the IV curve would be inefficient as a string, but I don’t
know how much of a loss would be expected.<br>
<br>
thanks in advance, and hopefully I didn’t miss anything in the archives.<br>
<br>
thanks,<br>
<br>
nick<o:p></o:p></span></font></p>
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