<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Thanks Dave,</div><div class="gmail_default" style="font-family:tahoma,sans-serif">We have installed many systems and we only had this problem with Sanyo modules and we had a rash of these crop up about the same time-frame and the issue only affected part of the array. Panasonic denied our claim because they stated it was a lightning strike. The cause is inconclusive in my opinion.</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 class="gmail_extra"><br><div class="gmail_quote">On Thu, Jul 6, 2017 at 4:25 PM, Dave Angelini Offgrid Solar <span dir="ltr"><<a href="mailto:offgridsolar@sti.net" target="_blank">offgridsolar@sti.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">The diode check on a dvm is useful but may not show a diode breaking down<br>
at higher voltage. Yes lightning can open up the tabs or connecting foil<br>
inside a solar panel. It can do alot more than that! One of the best<br>
reasons for using an SPD at the array is also preventing the latent damage<br>
that can show up later. A really close strike and prayer may help but I<br>
doubt it :)<br>
<br>
Dave Angelini Offgrid Solar<br>
"we go where powerlines don't"<br>
<a href="http://members.sti.net/offgridsolar/" rel="noreferrer" target="_blank">http://members.sti.net/<wbr>offgridsolar/</a><br>
e-mail <a href="mailto:offgridsolar@sti.net">offgridsolar@sti.net</a><br>
text <a href="tel:209%20813%200060" value="+12098130060">209 813 0060</a><br>
<br>
<br>
> Did you use the Diode Test function on the meter? If the diode is good<br>
> you<br>
> should see around 0.4-0.8 V in the forward bias, and OL in reverse. If it<br>
> is bad (open) you'll get OL in both directions, and if it is shorted<br>
> closed<br>
> you'll get the 0.4-0.8 V reading in both directions.<br>
><br>
> Shorted closed would be the failure mode that would indicate an<br>
> always-closed diode providing a permanent bypass path and thus a drop of<br>
> 25% of voltage per bad diode (or set of paralleled diodes). (These have 4<br>
> diodes right?).<br>
><br>
><br>
><br>
><br>
> Brian Mehalic<br>
> NABCEP Certified Solar PV Installation Professionalâ\u201e˘ R031508-59<br>
> 520.204.6639<br>
><br>
> Solar Energy International<br>
> <a href="http://www.solarenergy.org" rel="noreferrer" target="_blank">http://www.solarenergy.org</a><br>
><br>
> SEI Professional Services<br>
> <a href="http://www.seisolarpros.com" rel="noreferrer" target="_blank">http://www.seisolarpros.com</a><br>
><br>
><br>
> On Thu, Jul 6, 2017 at 4:31 PM, Taiyoko Sadewic <<br>
> <a href="mailto:taiyoko@positiveenergysolar.com">taiyoko@positiveenergysolar.<wbr>com</a>> wrote:<br>
><br>
>> Hi Wrenches,<br>
>> We were installing Sanyo HIT modules back in 2006-2007 and in 2014 we<br>
>> had<br>
>> a rash of bad Sanyo modules. The modules had distinct voltages below the<br>
>> good modules ie 50% or 75%. Sanyo at the time (now Panasonic) indicated<br>
>> that it was a bad diodes from a lightning strike not covered by<br>
>> warranty.<br>
>><br>
>> I finally got around to checking that out. I identified the purportedly<br>
>> bad diode in one module (four per module) that was performing at 75% and<br>
>> removed it. The diode appears to be fine using an ohm meter. Is that a<br>
>> valid test?<br>
>><br>
>> Anyone else have similar findings or experiences with this? Could<br>
>> lightning blow apart the tab ribbons inside of the module?<br>
>><br>
>> Thanks<br>
>><br>
>> --<br>
>> <<a href="http://www.PositiveEnergySolar.com" rel="noreferrer" target="_blank">http://www.<wbr>PositiveEnergySolar.com</a>><br>
>> Taiyoko Sadewic<br>
>> Employee-Owner<br>
>> NABCEPâ\u201e˘PV Installation Professional<br>
>> NABCEPâ\u201e˘Technical Sales<br>
>> 3209 Richards Lane | Santa Fe, NM 87507<br>
>> cell <a href="tel:505.570.0137" value="+15055700137">505.570.0137</a> <<a href="tel:505.699.9032" value="+15056999032">505.699.9032</a>><br>
>> Taiyoko@PositiveEnergySolar.<wbr>com <Taiyoko@PositiveEnergySolar.<wbr>com><br>
>> <a href="http://www.PositiveEnergySolar.com" rel="noreferrer" target="_blank">www.PositiveEnergySolar.com</a><br>
>> <<a href="http://www.positiveenergysolar.com/" rel="noreferrer" target="_blank">http://www.<wbr>positiveenergysolar.com/</a>><br>
>> <<a href="http://www.facebook.com/positiveenergysolar" rel="noreferrer" target="_blank">http://www.facebook.com/<wbr>positiveenergysolar</a>><br>
>> <<a href="https://twitter.com/PositiveESolar" rel="noreferrer" target="_blank">https://twitter.com/<wbr>PositiveESolar</a>><br>
>> <<a href="https://plus.google.com/+Positiveenergysolar" rel="noreferrer" target="_blank">https://plus.google.com/+<wbr>Positiveenergysolar</a>><br>
>> <<a href="https://www.youtube.com/user/PositiveEnergySolar" rel="noreferrer" target="_blank">https://www.youtube.com/user/<wbr>PositiveEnergySolar</a>><br>
>> <<a href="https://www.positiveenergysolar.com/blog/blog/" rel="noreferrer" target="_blank">https://www.<wbr>positiveenergysolar.com/blog/<wbr>blog/</a>><br>
>> <<a href="https://www.positiveenergysolar.com/contact/refer-a-friend/" rel="noreferrer" target="_blank">https://www.<wbr>positiveenergysolar.com/<wbr>contact/refer-a-friend/</a>><br>
>> <<a href="https://www.bcorporation.net/community/sunpower-positive-energy-solar" rel="noreferrer" target="_blank">https://www.bcorporation.net/<wbr>community/sunpower-positive-<wbr>energy-solar</a>><br>
>> <<a href="http://www.solarreviews.com/installers/positive-energy-solar-reviews/" rel="noreferrer" target="_blank">http://www.solarreviews.com/<wbr>installers/positive-energy-<wbr>solar-reviews/</a>><br>
>><br>
>> ______________________________<wbr>_________________<br>
>> List sponsored by Redwood Alliance<br>
>><br>
>> List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.<wbr>org</a><br>
>><br>
>> Change listserver email address & settings:<br>
>> <a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/<wbr>options.cgi/re-wrenches-re-<wbr>wrenches.org</a><br>
>><br>
>> List-Archive: <a href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches" rel="noreferrer" target="_blank">http://www.mail-archive.com/<wbr>re-wrenches@lists.re-wrenches</a>.<br>
>> org/maillist.html<br>
>><br>
>> List rules & etiquette:<br>
>> <a href="http://www.re-wrenches.org/etiquette.htm" rel="noreferrer" target="_blank">www.re-wrenches.org/etiquette.<wbr>htm</a><br>
>><br>
>> Check out or update participant bios:<br>
>> <a href="http://www.members.re-wrenches.org" rel="noreferrer" target="_blank">www.members.re-wrenches.org</a><br>
>><br>
>><br>
>><br>
> ______________________________<wbr>_________________<br>
> List sponsored by Redwood Alliance<br>
><br>
> List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.<wbr>org</a><br>
><br>
> Change listserver email address & settings:<br>
> <a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/<wbr>options.cgi/re-wrenches-re-<wbr>wrenches.org</a><br>
><br>
> List-Archive:<br>
> <a href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html" rel="noreferrer" target="_blank">http://www.mail-archive.com/<wbr>re-wrenches@lists.re-wrenches.<wbr>org/maillist.html</a><br>
><br>
> List rules & etiquette:<br>
> <a href="http://www.re-wrenches.org/etiquette.htm" rel="noreferrer" target="_blank">www.re-wrenches.org/etiquette.<wbr>htm</a><br>
><br>
> Check out or update participant bios:<br>
> <a href="http://www.members.re-wrenches.org" rel="noreferrer" target="_blank">www.members.re-wrenches.org</a><br>
><br>
><br>
<br>
<br>
______________________________<wbr>_________________<br>
List sponsored by Redwood Alliance<br>
<br>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.<wbr>org</a><br>
<br>
Change listserver email address & settings:<br>
<a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/<wbr>options.cgi/re-wrenches-re-<wbr>wrenches.org</a><br>
<br>
List-Archive: <a href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html" rel="noreferrer" target="_blank">http://www.mail-archive.com/<wbr>re-wrenches@lists.re-wrenches.<wbr>org/maillist.html</a><br>
<br>
List rules & etiquette:<br>
<a href="http://www.re-wrenches.org/etiquette.htm" rel="noreferrer" target="_blank">www.re-wrenches.org/etiquette.<wbr>htm</a><br>
<br>
Check out or update participant bios:<br>
<a href="http://www.members.re-wrenches.org" rel="noreferrer" target="_blank">www.members.re-wrenches.org</a><br>
<br>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_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><font color="#666666">Chief Financial Officer</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>\u2122<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>\u2122<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.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>
</div></div>