<font face="georgia" size="3"><p style="margin:0;padding:0;font-family: georgia; font-size: 12pt; word-wrap: break-word;">im not sure why i am even suggesting this, but have you tried twisting the separate string's pairs before running them through the conduit?</p>
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<p style="margin:0;padding:0;font-family: georgia; font-size: 12pt; word-wrap: break-word;"><br /><br />On Wednesday, September 7, 2016 6:55pm, "Matt Partymiller" <matt@solar-energy-solutions.com> said:<br /><br /></p>
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<p style="margin:0;padding:0;font-family: georgia; font-size: 12pt; word-wrap: break-word;">> Thanks for all the questions and interest in my troubleshooting.<br />> <br />> The polarities are definitely correct. When testing wires at the inverter<br />> with the DC disco off and fuses pulled, we see correct voltage on each<br />> string.<br />> <br />> We have tried using two clamp meters to measure current on each string<br />> while operating the inverter with our homeruns in the conduit. Using the<br />> max function we never saw a meter get above about 1.5A (even less earlier<br />> in the day). String two seemed to be consistently lower but I really<br />> wasn't sure if that was an inverter function or not as it ramps up towards<br />> max power. With the homeruns outside of conduit the inverter operates<br />> fine and both strings show similar, but not identical, current. Doing the<br />> math it appeared each string was producing roughly half of inverter output<br />> at that time.<br />> <br />> To Jerry's question, the system did operate fine for about a week and 65<br />> kWh. The inverter then failed. Our technician replaced that inverter<br />> with a new Solectria 3.8 kW unit, restarted the unit, and noted the<br />> problem. With Solectria's help he arrived at the idea that we had a<br />> faulty inverter, got a new one in, and noted the exact same error codes<br />> and began trying to troubleshoot. He left the third inverter installed<br />> and also installed a new Tigo Cloud Connect and Gateway for the Trinasmart<br />> system.<br />> <br />> The modules are 255 Trinasmarts with the integral Tigos. The folks at<br />> Tigo insist the issue is not theirs and, given that either string works<br />> fine by itself and both strings work fine when not in conduit, I tend to<br />> believe them. I just don't appreciate how having 20' of undamaged homerun<br />> wire in conduit as opposed to free air can make an inverter stop<br />> operating.<br />> <br />> Thanks,<br />> <br />> Matt<br />> <br />> <br />> <br />> On Wed, September 7, 2016 8:58 pm, jay wrote:<br />> > hate to ask the obvious here, but you mean to say that volts and polarity<br />> > are correct on both sets of wires at the inverter when not connected?<br />> ><br />> > and<br />> ><br />> > 2. what wattage modules are you using?<br />> ><br />> ><br />> > jay peltz power<br />> ><br />> ><br />> ><br />> ><br />> ><br />> ><br />> ><br />> ><br />> >> On Sep 7, 2016, at 2:45 PM, Matt Partymiller<br />> >> <matt@solar-energy-solutions.com> wrote:<br />> >><br />> >><br />> >> Wrenches,<br />> >><br />> >><br />> >> One of our systems is having an issue I have not encountered before<br />> >> where the inverter switches between nighttime mode and interconnection<br />> >> every few seconds. I am hoping for some technical wisdom from the<br />> >> community.<br />> >><br />> >> We have an array of 20 TrinaSmart modules in two strings of 10. The<br />> >> array is connected to a Solectria 3.8 kW inverter. The conduit run is<br />> >> simple, all four homerun wires (#10 PVwire) in 1" EMT down to the<br />> >> proximity of the Solectria inverter where the conduit switches to 1"<br />> >> 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<br />> >> also 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<br />> >> but we have the exact same issue. They tell us their error codes (266,<br />> >> 274)<br />> >> indicate 0 volts. The transition between low voltage error and startup<br />> >> is almost instant. Basically we have 20 seconds of start up, 5 seconds<br />> >> of 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<br />> >> homerun wires out of our conduit and meggered them. They all tested<br />> >> fine so he connected to the inverter. The inverter worked fine. The<br />> >> technician verified grounding of the array and conduit, pulled new<br />> >> homeruns back through the conduit, and reconnected to the inverter. He<br />> >> had the same error as before.<br />> >><br />> >> He connected each string separately to the inverter by removing the<br />> >> string fuses. Either string will operate fine independently. With<br />> >> string one in conduit and either homerun of string two in conduit (but<br />> >> not both) the inverter operates fine. With string two in conduit but<br />> >> string one outside of conduit, the inverter does not operate.<br />> >><br />> >> I was certain the error had something to do with homerun roof wiring so<br />> >> I<br />> >> went out with the technician and removed and checked pretty much every<br />> >> module. Everything appears fine, all connections solid, all homeruns<br />> >> have been remade at least once at this point. Now I am stumped and lack<br />> >> the 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 />> >><br />> >> Matt<br />> >><br />> >><br />> >><br />> >><br />> >><br />> >> Matthew Partymiller<br />> >> Solar Energy Solutions LLC<br />> >> (877) 312-7456<br />> >> matt@solar-energy-solutions.com<br />> >><br />> >><br />> >> _______________________________________________<br />> >> List sponsored by Redwood Alliance<br />> >><br />> >><br />> >> List Address: RE-wrenches@lists.re-wrenches.org<br />> >><br />> >><br />> >> Change listserver email address & settings:<br />> >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org<br />> >><br />> >><br />> >> List-Archive:<br />> >> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.<br />> >> html<br />> >><br />> >> List rules & etiquette:<br />> >> www.re-wrenches.org/etiquette.htm<br />> >><br />> >> Check out or update participant bios:<br />> >> www.members.re-wrenches.org<br />> >><br />> ><br />> > _______________________________________________<br />> > List sponsored by Redwood Alliance<br />> ><br />> ><br />> > List Address: RE-wrenches@lists.re-wrenches.org<br />> ><br />> ><br />> > Change listserver email address & settings:<br />> > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org<br />> ><br />> ><br />> > List-Archive:<br />> > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.ht<br />> > ml<br />> ><br />> > List rules & etiquette:<br />> > www.re-wrenches.org/etiquette.htm<br />> ><br />> > Check out or update participant bios:<br />> > www.members.re-wrenches.org<br />> ><br />> ><br />> <br />> <br />> Matthew Partymiller<br />> Solar Energy Solutions LLC<br />> (877) 312-7456<br />> matt@solar-energy-solutions.com<br />> <br />> <br />> _______________________________________________<br />> List sponsored by Redwood Alliance<br />> <br />> List Address: RE-wrenches@lists.re-wrenches.org<br />> <br />> Change listserver email address & settings:<br />> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org<br />> <br />> List-Archive:<br />> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html<br />> <br />> List rules & etiquette:<br />> www.re-wrenches.org/etiquette.htm<br />> <br />> Check out or update participant bios:<br />> www.members.re-wrenches.org<br />> <br />> </p>
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