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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Definitely check polarity on each string. Could be positives and negatives are mixed up and the wire colors are adding to the confusion. </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">August</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> RE-wrenches [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Roy Rakobitsch<br><b>Sent:</b> Wednesday, September 07, 2016 3:35 PM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] Troubleshooting Stumper - Homerun Interference in Conduit/Inverter Turning Off/On Rapidly</span></p></div><p class="MsoNormal"> </p><p>Have you measured the current of each string simultaneously while the issue was happening? Have you verified correct polarity on each string?</p><p>Roy Rakobitsch<br>NABCEP Certified Small Wind Installer®<br>Certified Advanced Tower Climbing, Safety & Rescue<br>Wind/PV Design Engineer<br>Windsine LLC<br>631-514-4166<br><a href="http://www.windsine.org">www.windsine.org</a></p><div><p class="MsoNormal"> </p><div><p class="MsoNormal">On Sep 7, 2016 4:45 PM, "Matt Partymiller" <<a href="mailto:matt@solar-energy-solutions.com">matt@solar-energy-solutions.com</a>> wrote:</p><p class="MsoNormal" style="margin-bottom:12.0pt">Wrenches,<br><br>One of our systems is having an issue I have not encountered before where<br>the inverter switches between nighttime mode and interconnection every few<br>seconds. I am hoping for some technical wisdom from the community.<br><br>We have an array of 20 TrinaSmart modules in two strings of 10. The array<br>is connected to a Solectria 3.8 kW inverter. The conduit run is simple,<br>all four homerun wires (#10 PVwire) in 1" EMT down to the proximity of the<br>Solectria inverter where the conduit switches to 1" LFMC before entering<br>the inverter. The run is about 20', straight down the side of the wall<br>before hitting the inverter. A 600V jacketed communications wire was also<br>in the conduit but has since been removed and run separately.<br><br>Our inverter is starting up, running for a few seconds, giving a low<br>voltage error, briefly showing nighttime mode, then going into startup<br>mode again. Solectria was gracious enough to send us a new inverter but<br>we have the exact same issue. They tell us their error codes (266, 274)<br>indicate 0 volts. The transition between low voltage error and startup is<br>almost instant. Basically we have 20 seconds of start up, 5 seconds of<br>run, 5 seconds of error then repeat. This is not a grid problem, the<br>identical system next door works fine.<br><br>In the process of troubleshooting, our technician pulled all four homerun<br>wires out of our conduit and meggered them. They all tested fine so he<br>connected to the inverter. The inverter worked fine. The technician<br>verified grounding of the array and conduit, pulled new homeruns back<br>through the conduit, and reconnected to the inverter. He had the same<br>error as before.<br><br>He connected each string separately to the inverter by removing the string<br>fuses. Either string will operate fine independently. With string one in<br>conduit and either homerun of string two in conduit (but not both) the<br>inverter operates fine. With string two in conduit but string one outside<br>of conduit, the inverter does not operate.<br><br>I was certain the error had something to do with homerun roof wiring so I<br>went out with the technician and removed and checked pretty much every<br>module. Everything appears fine, all connections solid, all homeruns have<br>been remade at least once at this point. Now I am stumped and lack the<br>technical knowledge to diagnose the problem. I would be extremely<br>grateful if an esteemed wrench can provide technical support/advice.<br><br>Thanks,<br><br>Matt<br><br><br><br><br>Matthew Partymiller<br>Solar Energy Solutions LLC<br>(877) 312-7456<br><a href="mailto:matt@solar-energy-solutions.com">matt@solar-energy-solutions.com</a><br><br><br>_______________________________________________<br>List sponsored by Redwood Alliance<br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">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" 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" 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" 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" target="_blank">www.members.re-wrenches.org</a></p></div></div></div></body></html>