I was thinking the same, done with battery cables to reduce inductance, Lloyd
Sent from my iPhone On Sep 7, 2016, at 10:16 PM, "toddc...@finestplanet.com<mailto:toddc...@finestplanet.com>" <toddc...@finestplanet.com<mailto:toddc...@finestplanet.com>> wrote: 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? todd On Wednesday, September 7, 2016 6:55pm, "Matt Partymiller" <m...@solar-energy-solutions.com<mailto:m...@solar-energy-solutions.com>> said: > Thanks for all the questions and interest in my troubleshooting. > > The polarities are definitely correct. When testing wires at the inverter > with the DC disco off and fuses pulled, we see correct voltage on each > string. > > We have tried using two clamp meters to measure current on each string > while operating the inverter with our homeruns in the conduit. Using the > max function we never saw a meter get above about 1.5A (even less earlier > in the day). String two seemed to be consistently lower but I really > wasn't sure if that was an inverter function or not as it ramps up towards > max power. With the homeruns outside of conduit the inverter operates > fine and both strings show similar, but not identical, current. Doing the > math it appeared each string was producing roughly half of inverter output > at that time. > > To Jerry's question, the system did operate fine for about a week and 65 > kWh. The inverter then failed. Our technician replaced that inverter > with a new Solectria 3.8 kW unit, restarted the unit, and noted the > problem. With Solectria's help he arrived at the idea that we had a > faulty inverter, got a new one in, and noted the exact same error codes > and began trying to troubleshoot. He left the third inverter installed > and also installed a new Tigo Cloud Connect and Gateway for the Trinasmart > system. > > The modules are 255 Trinasmarts with the integral Tigos. The folks at > Tigo insist the issue is not theirs and, given that either string works > fine by itself and both strings work fine when not in conduit, I tend to > believe them. I just don't appreciate how having 20' of undamaged homerun > wire in conduit as opposed to free air can make an inverter stop > operating. > > Thanks, > > Matt > > > > On Wed, September 7, 2016 8:58 pm, jay wrote: > > hate to ask the obvious here, but you mean to say that volts and polarity > > are correct on both sets of wires at the inverter when not connected? > > > > and > > > > 2. what wattage modules are you using? > > > > > > jay peltz power > > > > > > > > > > > > > > > > > >> On Sep 7, 2016, at 2:45 PM, Matt Partymiller > >> <m...@solar-energy-solutions.com<mailto:m...@solar-energy-solutions.com>> > >> wrote: > >> > >> > >> Wrenches, > >> > >> > >> One of our systems is having an issue I have not encountered before > >> where the inverter switches between nighttime mode and interconnection > >> every few seconds. I am hoping for some technical wisdom from the > >> community. > >> > >> We have an array of 20 TrinaSmart modules in two strings of 10. The > >> array is connected to a Solectria 3.8 kW inverter. The conduit run is > >> simple, all four homerun wires (#10 PVwire) in 1" EMT down to the > >> proximity of the Solectria inverter where the conduit switches to 1" > >> LFMC before entering > >> the inverter. The run is about 20', straight down the side of the wall > >> before hitting the inverter. A 600V jacketed communications wire was > >> also in the conduit but has since been removed and run separately. > >> > >> Our inverter is starting up, running for a few seconds, giving a low > >> voltage error, briefly showing nighttime mode, then going into startup > >> mode again. Solectria was gracious enough to send us a new inverter > >> but we have the exact same issue. They tell us their error codes (266, > >> 274) > >> indicate 0 volts. The transition between low voltage error and startup > >> is almost instant. Basically we have 20 seconds of start up, 5 seconds > >> of run, 5 seconds of error then repeat. This is not a grid problem, the > >> identical system next door works fine. > >> > >> In the process of troubleshooting, our technician pulled all four > >> homerun wires out of our conduit and meggered them. They all tested > >> fine so he connected to the inverter. The inverter worked fine. The > >> technician verified grounding of the array and conduit, pulled new > >> homeruns back through the conduit, and reconnected to the inverter. He > >> had the same error as before. > >> > >> He connected each string separately to the inverter by removing the > >> string fuses. Either string will operate fine independently. With > >> string one in conduit and either homerun of string two in conduit (but > >> not both) the inverter operates fine. With string two in conduit but > >> string one outside of conduit, the inverter does not operate. > >> > >> I was certain the error had something to do with homerun roof wiring so > >> I > >> went out with the technician and removed and checked pretty much every > >> module. Everything appears fine, all connections solid, all homeruns > >> have been remade at least once at this point. Now I am stumped and lack > >> the technical knowledge to diagnose the problem. I would be extremely > >> grateful if an esteemed wrench can provide technical support/advice. > >> > >> Thanks, > >> > >> > >> Matt > >> > >> > >> > >> > >> > >> Matthew Partymiller > >> Solar Energy Solutions LLC > >> (877) 312-7456 > >> m...@solar-energy-solutions.com<mailto:m...@solar-energy-solutions.com> > >> > >> > >> _______________________________________________ > >> List sponsored by Redwood Alliance > >> > >> > >> List Address: > >> RE-wrenches@lists.re-wrenches.org<mailto:RE-wrenches@lists.re-wrenches.org> > >> > >> > >> Change listserver email address & settings: > >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > >> > >> > >> List-Archive: > >> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist. > >> html > >> > >> List rules & etiquette: > >> www.re-wrenches.org/etiquette.htm<http://www.re-wrenches.org/etiquette.htm> > >> > >> Check out or update participant bios: > >> www.members.re-wrenches.org<http://www.members.re-wrenches.org> > >> > > > > _______________________________________________ > > List sponsored by Redwood Alliance > > > > > > List Address: > > RE-wrenches@lists.re-wrenches.org<mailto:RE-wrenches@lists.re-wrenches.org> > > > > > > Change listserver email address & settings: > > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > > > > > List-Archive: > > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.ht > > ml > > > > List rules & etiquette: > > www.re-wrenches.org/etiquette.htm<http://www.re-wrenches.org/etiquette.htm> > > > > Check out or update participant bios: > > www.members.re-wrenches.org<http://www.members.re-wrenches.org> > > > > > > > Matthew Partymiller > Solar Energy Solutions LLC > (877) 312-7456 > m...@solar-energy-solutions.com<mailto:m...@solar-energy-solutions.com> > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: > RE-wrenches@lists.re-wrenches.org<mailto:RE-wrenches@lists.re-wrenches.org> > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm<http://www.re-wrenches.org/etiquette.htm> > > Check out or update participant bios: > www.members.re-wrenches.org<http://www.members.re-wrenches.org> > > Sent from Finest Planet WebMail. _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org<mailto:RE-wrenches@lists.re-wrenches.org> Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm<http://www.re-wrenches.org/etiquette.htm> Check out or update participant bios: www.members.re-wrenches.org<http://www.members.re-wrenches.org>
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