<div dir="ltr">Did you use the Diode Test function on the meter? If the diode is good you should see around 0.4-0.8 V in the forward bias, and OL in reverse. If it is bad (open) you'll get OL in both directions, and if it is shorted closed you'll get the 0.4-0.8 V reading in both directions. <div><br></div><div>Shorted closed would be the failure mode that would indicate an always-closed diode providing a permanent bypass path and thus a drop of 25% of voltage per bad diode (or set of paralleled diodes). (These have 4 diodes right?).</div><div><br></div><div><br></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><br></div><div>Brian Mehalic <br>NABCEP Certified Solar PV Installation Professional™ R031508-59</div><div>520.204.6639<br><div><br></div><div><div><div>Solar Energy International<br><a href="http://www.solarenergy.org" target="_blank">http://www.solarenergy.org</a></div></div></div></div><div><br></div><div>SEI Professional Services</div><div><a href="http://www.seisolarpros.com" target="_blank"><span style="font-size:12.8px">http://www.s</span>eisolarpros.com</a><br></div><div><br></div></div></div></div></div></div></div></div>
<br><div class="gmail_quote">On Thu, Jul 6, 2017 at 4:31 PM, Taiyoko Sadewic <span dir="ltr"><<a href="mailto:taiyoko@positiveenergysolar.com" target="_blank">taiyoko@positiveenergysolar.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Hi Wrenches,</div><div class="gmail_default" style="font-family:tahoma,sans-serif">We were installing Sanyo HIT modules back in 2006-2007 and in 2014 we had a rash of bad Sanyo modules. The modules had distinct voltages below the good modules ie 50% or 75%. Sanyo at the time (now Panasonic) indicated that it was a bad diodes from a lightning strike not covered by warranty. </div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">I finally got around to checking that out. I identified the purportedly bad diode in one module (four per module) that was performing at 75% and removed it. The diode appears to be fine using an ohm meter. Is that a valid test? </div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Anyone else have similar findings or experiences with this? Could lightning blow apart the tab ribbons inside of the module? </div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Thanks</div><div><br></div>-- <br><div class="m_5141930912267872760gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><a href="http://www.PositiveEnergySolar.com" target="_blank"></a><div dir="ltr"><font face="Calibri"><span style="font-size:15px"><font color="#0076be">Taiyoko Sadewic <br></font></span></font><span><font face="Calibri"><span style="font-size:15px"><font color="#666666">Employee-Owner <br></font></span></font></span></div><div><font face="Calibri"><span style="font-size:15px"><font color="#666666">NABCEP</font></span></font>™<font face="Calibri"><span style="font-size:15px"><font color="#666666">PV Installation Professional<br></font></span></font></div><div><font face="Calibri"><span style="font-size:15px"><font color="#666666">NABCEP</font></span></font>™<font face="Calibri"><span style="font-size:15px"><font color="#666666">Technical Sales<br></font></span></font></div><div dir="ltr"><span style="font-size:15px;color:rgb(102,102,102);font-family:Calibri">3209 Richards Lane | Santa Fe, NM 87507</span></div><div dir="ltr"><span style="font-size:15px;color:rgb(102,102,102);font-family:Calibri">cell <a href="tel:505.699.9032" value="+15056999032" target="_blank">505.570.0137</a></span><br></div><div dir="ltr"><div><font face="Calibri" color="#3d85c6"><span style="font-size:15px"><a href="mailto:Taiyoko@PositiveEnergySolar.com" target="_blank"><font color="#3d85c6">Taiyoko</font>@PositiveEnergySolar.<wbr>com </a></span></font></div><div><font face="Calibri" color="#3d85c6"><span style="font-size:15px"><a href="http://www.PositiveEnergySolar.com" target="_blank">www.PositiveEnergySolar.com</a></span></font></div><div><font style="color:rgb(136,136,136)" color="#888888"><div><font face="Calibri" color="#0076be"><span style="font-size:15px"><a href="http://www.positiveenergysolar.com/" style="color:rgb(17,85,204)" target="_blank"><img src="https://www.positiveenergysolar.com/wp-content/uploads/Positive-Energy-Solar-horizxs.png"></a><br></span></font></div><div><font color="#888888"><font face="Calibri" color="#0076be"> <a href="http://www.facebook.com/positiveenergysolar" style="color:rgb(17,85,204)" target="_blank"><img src="https://www.positiveenergysolar.com/wp-content/uploads/FBicon.jpg"></a> <a href="https://twitter.com/PositiveESolar" style="color:rgb(17,85,204)" target="_blank"><img src="https://www.positiveenergysolar.com/wp-content/uploads/TWicon.jpg"></a> <a href="https://plus.google.com/+Positiveenergysolar" style="color:rgb(17,85,204)" target="_blank"><img src="https://www.positiveenergysolar.com/wp-content/uploads/Gicon.jpg"></a> <a href="https://www.youtube.com/user/PositiveEnergySolar" style="color:rgb(17,85,204)" target="_blank"><img src="https://www.positiveenergysolar.com/wp-content/uploads/YouTubeicon.jpg"></a> <a href="https://www.positiveenergysolar.com/blog/blog/" style="color:rgb(17,85,204)" target="_blank"><img src="https://www.positiveenergysolar.com/wp-content/uploads/Blogicon.jpg"></a> <br> <a href="https://www.positiveenergysolar.com/contact/refer-a-friend/" style="color:rgb(17,85,204)" target="_blank"><img src="https://www.positiveenergysolar.com/wp-content/uploads/Referral-button-SPRbyPES.jpg" height="58" width="200"></a><br></font></font><a href="https://www.bcorporation.net/community/sunpower-positive-energy-solar" style="font-family:Calibri;color:rgb(17,85,204)" target="_blank"><img src="https://www.positiveenergysolar.com/wp-content/uploads/BCorp_logo.jpg" height="96" width="60"></a> <font color="#888888"><font color="#888888"><font face="Calibri" color="#0076be"> <a href="http://www.solarreviews.com/installers/positive-energy-solar-reviews/" style="color:rgb(17,85,204)" target="_blank"><img src="https://www.positiveenergysolar.com/wp-content/uploads/SR-2016-logo.jpg" height="89" width="96"></a></font></font></font></div></font></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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