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<div>I was thinking the same, done with battery cables to reduce inductance,</div>
<div>Lloyd<br>
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On Sep 7, 2016, at 10:16 PM, "<a href="mailto:toddcory@finestplanet.com">toddcory@finestplanet.com</a>" <<a href="mailto:toddcory@finestplanet.com">toddcory@finestplanet.com</a>> wrote:<br>
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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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todd</p>
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On Wednesday, September 7, 2016 6:55pm, "Matt Partymiller" <<a href="mailto:matt@solar-energy-solutions.com">matt@solar-energy-solutions.com</a>> said:<br>
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> 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>
> >> <<a href="mailto:matt@solar-energy-solutions.com">matt@solar-energy-solutions.com</a>> 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>
> >> <a href="mailto:matt@solar-energy-solutions.com">matt@solar-energy-solutions.com</a><br>
> >><br>
> >><br>
> >> _______________________________________________<br>
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> <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>
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