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<div class=Section1>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;color:black'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;color:black'> </span></font></p>
<div>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Peter T. Parrish, Ph.D., President<br>
California Solar Engineering, Inc.<br>
820 Cynthia Ave., Los Angeles, CA 90065<br>
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885<br>
CA Lic. 854779, NABCEP Cert. 031806-26<br>
peter.parrish@calsolareng.com</span></font><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'> </span></font></p>
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face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman"'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Peter Parrish
[mailto:peter.parrish@calsolareng.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, November 21, 2008
9:10 AM<br>
<b><span style='font-weight:bold'>To:</span></b> 'RE-wrenches'<br>
<b><span style='font-weight:bold'>Cc:</span></b> 'Peter Parrish'<br>
<b><span style='font-weight:bold'>Subject:</span></b> DC Rating of Disconnects</span></font></p>
</div>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;color:black'>I am looking into using the PV Powered PVP2000 inverter for
some small, low voltage designs. The string Voc will be around 200 Vdc, worst
case.</span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;color:black'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;color:black'>Since the PVP2000 doesn’t come with a DC disconnect,
I am wondered what other wrenches who install the PVP2000 have been doing about
this. I hate to spend $150 on a 600 V AC/DC disco such as the SD HU361RB to
provide the means of disconnection. I believe that the 240 V AC discos such as
the SD DU221RB have no DC rating.</span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;color:black'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;color:black'>From an academic point of view, I wonder why the smaller
discos are not dual rated, since we all know that the real-time voltage
difference in a 240 V AC system can be 41% greater than 240 V.</span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;color:black'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;color:black'>In any event, any Code-compliant solutions would be greatly
appreciated.</span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;color:black'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face=Arial><span style='font-size:
12.0pt;color:black'>- Peter</span></font></p>
<div>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Peter T. Parrish, President<br>
California Solar Engineering, Inc.<br>
820 Cynthia Ave., Los Angeles, CA 90065<br>
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885<br>
CA Lic. 854779, NABCEP Cert. 031806-26<br>
peter.parrish@calsolareng.com</span></font><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'> </span></font></p>
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