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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><font size=4 color="#1f497d" face=Calibri><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If you cut them during the day, under sunlight conditions it can do bad things to the wire cutters.<o:p></o:p></span></font></p><p class=MsoNormal><font size=4 color="#1f497d" face=Calibri><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=4 color="#1f497d" face=Calibri><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Been there before,<o:p></o:p></span></font></p><p class=MsoNormal><font size=4 color="#1f497d" face=Calibri><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Bob Ellison<o:p></o:p></span></font></p><p class=MsoNormal><font size=4 color="#1f497d" face=Calibri><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></font></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";font-weight:bold'>From:</span></font></b><font size=2 face=Tahoma><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><span style='font-weight:bold'>On Behalf Of </span></b>john<br><b><span style='font-weight:bold'>Sent:</span></b> Tuesday, September 18, 2012 1:43 PM<br><b><span style='font-weight:bold'>To:</span></b> re-wrenches@lists.re-wrenches.org<br><b><span style='font-weight:bold'>Subject:</span></b> Re: [RE-wrenches] wrenches] Short Circuit Cell Damage<o:p></o:p></span></font></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><div><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Mark,<o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> As far as cutting the jumper for us nightowls, it is easy. Wait until dark. The sun actually turns off every day!.<br>And for the new people on the block, polarity can still be determined after dark. All you need is a microvolt to get polarity. <o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><br>John<o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>CV Solar<o:p></o:p></span></font></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>-----Original Message-----<br>From: benn kilburn <<a href="mailto:benn@daystarsolar.ca">benn@daystarsolar.ca</a>><br>To: RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br>Sent: Tue, Sep 18, 2012 1:48 am<br>Subject: Re: [RE-wrenches] Short Circuit Cell Damage<o:p></o:p></span></font></p><div id="AOLMsgPart_2_91e216c6-2ac4-43ed-aaa5-7d1988abf6d6"><div><div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>Mark,</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>Shorting the string should not be an issue. </span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>Unless you work at night, obviously there will be an arc when you cut the jumper, so remember to cover the whole string with an opaque covering beforehand… I think I remember reading that somewhere?!?! </span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>Or just be careful, try to do it when the irradiance is low (less current), separate the cut wires quickly and make sure you have left enough wire in the box so that you are not working with short (and energized) wires in a metal box. put a wire nut on one wire while you handle and terminate the other.</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>A safer method, if possible, would be to leave an easily accessible module interconnection un-connected until you have terminated the home run (+)&(-), then go back and make the final module interconnection.</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>Cheers,</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>benn</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>DayStar Renewable Energy Inc. </span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'><a href="http://www.daystarsolar.ca/" target="_blank">www.daystarsolar.ca</a> * Ph: 780-906-7807 </span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>Construction Electrician Solar Photovoltaic Systems Certified</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>Certificate # 0007S</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>HAVE A SUNNY DAY</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div></div></div></div></div><div><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></font></p></div><div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>On 17/09/12 9:50 PM, "Mark Frye" <<a href="mailto:markf@berkeleysolar.com">markf@berkeleysolar.com</a>> wrote:</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div></div><div><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></font></p></div><div><div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>Wrenches,</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>True or False: In a nominal sort of grid tied situation with string Voc </span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>at about 300 VDC and Isc at about 6 or 7 amps......It is OK to install </span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>modules on a roof in the sun and short the pos and neg together </span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>indefinitely.</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>In other words modules can handle operating at Isc continuously without </span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>damage. It is only if you get localized shading AND a failed bypass </span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>diode that damaging hot spot heating can lead to failure?</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>I am reviewing an installation manual that recommends completing the </span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>home run by connecting the pos and neg of the string with a single </span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>jumper cable, folding the cable on itself in order to push it through to </span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>a j-box and at some point later on, cutting the jumper in the j-box to </span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>terminate the pos and negs to the home run.</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>I am concerned both about maintaining the string in a short circuit </span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>condition and cutting the jumper while energized.</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>Any thoughts?</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>Mark Frye</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color="#00007f" face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#00007F'>Berkeley Solar Electric Systems</span></font><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></font></p></div><div><p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'><o:p> </o:p></span></font></p></div></div></div></div><div id="AOLMsgPart_3_91e216c6-2ac4-43ed-aaa5-7d1988abf6d6"><pre style='background:white'><tt><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'>_______________________________________________<o:p></o:p></span></font></tt></pre><pre style='background:white'><tt><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'>List sponsored by Home Power magazine<o:p></o:p></span></font></tt></pre><pre style='background:white'><tt><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></tt></pre><pre style='background:white'><tt><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><o:p></o:p></span></font></tt></pre><pre style='background:white'><tt><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></tt></pre><pre style='background:white'><tt><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'>Options & settings:<o:p></o:p></span></font></tt></pre><pre style='background:white'><tt><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><o:p></o:p></span></font></tt></pre><pre style='background:white'><tt><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></tt></pre><pre style='background:white'><tt><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'>List-Archive: <a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><o:p></o:p></span></font></tt></pre><pre style='background:white'><tt><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></tt></pre><pre style='background:white'><tt><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'>List rules & etiquette:<o:p></o:p></span></font></tt></pre><pre style='background:white'><tt><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'><a href="http://www.re-wrenches.org/etiquette.htm" target="_blank">www.re-wrenches.org/etiquette.htm</a><o:p></o:p></span></font></tt></pre><pre style='background:white'><tt><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></tt></pre><pre style='background:white'><tt><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'>Check out participant bios:<o:p></o:p></span></font></tt></pre><pre style='background:white'><tt><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'><a href="http://www.members.re-wrenches.org/" target="_blank">www.members.re-wrenches.org</a><o:p></o:p></span></font></tt></pre><pre style='background:white'><tt><font size=2 color=black face="Courier New"><span style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></tt></pre></div></div></div></body></html>