<div dir="ltr">Thanks for sharing, Jason. That's an excellent cautionary tale...</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jan 22, 2020 at 2:58 PM Jason Szumlanski <<a href="mailto:jason@floridasolardesigngroup.com">jason@floridasolardesigngroup.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">I discovered the issue I believe, so I thought I'd update all of you who gave me ideas on what to look for (thank you).</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">And this is something that I stress the importance of all the time...</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">The branch circuit pairs were not properly paired up! All of the L1 conductors went to L1 on the bus and all of the L2 to L2. However, for example, circuit 1 L1 and circuit 2 L2 were on a single 2-pole breaker. And circuit 2 L1 and circuit 1 L2 were on another breaker. Everything worked because it was electrically connected to the right bus bar. However, when there was a previous fault one of the breakers probably didn't trip when it should have as a result of the improper pairings. It was reset a few times and just kept heating up and heating up.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">This isn't conclusive, but it sure makes sense. It wasn't fun tracking this down with 5 strings and 5 junction boxes on the roof, but once we started continuity testing and finding strange results, it became clear.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Jason Szumlanski</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><img width="0" height="0" alt="" style="display: flex;" src="https://mailtrack.io/trace/mail/0bcc59ffd51f7c8a39405a94b2fcaee132703435.png?u=1613865"></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jan 21, 2020 at 12:10 PM Jason Szumlanski <<a href="mailto:jason@floridasolardesigngroup.com" target="_blank">jason@floridasolardesigngroup.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">(System installed by another contractor...)</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">I have been tasked with assisting in the investigation of damage in a subpanel used to combine inverter output circuits (5 strings of microinverters). There appears to be no damage to conductors or other system components. It looks like the damage started at the stabs of the bus bar where the breakers connect. Picture attached. Here are a few clues:</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><ul><li>Monitoring indicates that damage occurred overnight a few weeks ago. That night we had rain as a winter front came through Florida, possibly lightning. The prior day everything was fine.</li><li>The next morning, only 2 of 5 strings started producing power, but 4 of 5 strings were reporting data to the Envoy. The two strings that were reporting but not producing power reported 0Vac and Voc on the DC side of the microinverters. </li><li>A couple of weeks later, 1 of the 2 strings that was producing power quit doing so, but continued reporting data.</li><li>Customer discovered damage yesterday.</li><li>About a week before the initial damage apparently manifested itself, another contractor installed a whole house generator transfer switch on the line side of the PV interconnection. The generator has never been run (there is not even a LP fuel source on site yet). I pointed out that the solar interconnection, which was previously on the supply side, would need to be moved to the supply side of the generator transfer switch's main breaker before operation. During the transfer switch installation, the contractor also switched line 1 and line 2, but that shouldn't really matter, except for Enphase consumption monitoring, which was messed up by the swapping of the lines.</li></ul><div>So I'm looking for ideas. I'm wondering if the OCPD would be a likely place for lightning damage to manifest itself. I can't visually detect any other damage anywhere else. I can't imagine that the transfer switch installation would have anything to do with it, but the timing is interesting. Other than replacing the subpanel and OCPD and firing it back up (no pun intended), I'm not sure how to approach further investigation.</div><div><br></div><div>Jason Szumlanski</div><div>Florida Solar Design Group</div></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><b><div style="text-align:center"><br></div></b></div></div></div></div></div></div></div></div></div><img width="0" height="0" alt="" style="display: flex;"></div>
</blockquote></div>
_______________________________________________<br>
List sponsored by Redwood Alliance<br>
<br>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.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/options.cgi/re-wrenches-re-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/re-wrenches@lists.re-wrenches.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.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 clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><span style="color:rgb(136,136,136)"><br></span></div><div><div dir="ltr" style="color:rgb(136,136,136)"><div dir="ltr"></div></div><span><p dir="ltr" style="line-height:1.38;margin-top:12pt;margin-bottom:12pt"><span style="font-size:12pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:700;vertical-align:baseline;white-space:pre-wrap">Blake Gleason, PE | Employee Owner</span><span style="font-size:12pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:700;vertical-align:baseline;white-space:pre-wrap"><br></span><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap">Director of Innovation and Technical Excellence<br></span><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap">O: 510-845-2997 x128</span><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><br></span><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap">C: 510-867-5878</span></p><p dir="ltr" style="line-height:1.38;margin-top:12pt;margin-bottom:12pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><span style="border:none;display:inline-block;overflow:hidden;width:200px;height:105px"><img src="https://lh4.googleusercontent.com/9HZ43SgRr_bF_Yd-CLwdZP7MjUXXSYm84_EQ6NxrpYEfn8zrwHdL7zSPGVhtOGMB9NCLVH480W0EJe-8kQSN-ZAoE8gM1mTT9vEUz26kGgN7I-UfWWpqeYea0LVHI9M9wpgYI_0H" width="200" height="105" style="margin-left: 0px; margin-top: 0px;"></span></span></p><p dir="ltr" style="line-height:1.38;margin-top:12pt;margin-bottom:12pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap">1035 Folger Ave.</span><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><br></span><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap">Berkeley, CA 94710</span><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><br></span><a href="http://www.sunlightandpower.com" target="_blank"><span style="font-size:11pt;font-family:Arial;color:rgb(17,85,204);background-color:transparent;vertical-align:baseline;white-space:pre-wrap">www.sunlightandpower.com</span><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><br></span></a><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap">License #326203</span></p><p dir="ltr" style="line-height:1.38;margin-top:12pt;margin-bottom:12pt"><a href="https://bcorporation.net/" target="_blank"><span style="font-size:11pt;font-family:Arial;color:rgb(17,85,204);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><span style="border:none;display:inline-block;overflow:hidden;width:45px;height:70px"><img src="https://lh4.googleusercontent.com/Ob2tw4tReIK2J9NkUY-rRxraSCElvSTw5pYpb9FWCBB3e9ZuwEPyPj6Fi3WxCGYgRuFI1mRyQ-FJhmMw1WT968iRJCSUBNUhDtJGPvjeikrNc3wqW-q7NObHVSs8cYNbNoofUVuy" width="45" height="70" style="margin-left: 0px; margin-top: 0px;"></span></span></a><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"> </span><a href="https://www.amicussolar.com/" target="_blank"><span style="font-size:11pt;font-family:Arial;color:rgb(17,85,204);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"> </span><span style="font-size:11pt;font-family:Arial;color:rgb(17,85,204);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><span style="border:none;display:inline-block;overflow:hidden;width:96px;height:56px"><img src="https://lh3.googleusercontent.com/GOJhgrOdaTRamGu3C3QIfZwjjqFoLWljEOSftBnRT4TiOVSQr-WwwosRvWw0S5DPcXtErAV6RjQpQJxkc8ogbSbiPHrZBr64-5IXJA1QBQSbvCQu655wN9mzp9eHWMA9c_kh3rm5" width="96" height="56" style="margin-left: 0px; margin-top: 0px;"></span></span></a><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"> </span><span style="font-size:11pt;font-family:Arial;color:rgb(17,85,204);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><span style="border:none;display:inline-block;overflow:hidden;width:96px;height:28px"><a href="https://calssa.org/" target="_blank"><img src="https://lh6.googleusercontent.com/SBzauSz3hH8Mz_qvlszsbBaDp6O_dWb-PC0CDgi4x8ot1CO7WdRoWdD3JupSOlnzUBdhq_wgIfrd9M66T9C7mSx6ni6BDcfvVegpqUYZLN6K2qfEQ32oCqeoZgYGTugw9qx96In-" width="96" height="28" style="margin-left: 0px; margin-top: 0px;"></a></span></span></p><div><span style="font-size:11pt;font-family:Arial;color:rgb(17,85,204);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><br></span></div></span></div></div></div></div></div></div></div></div>