I did a little test today and it looks like everything was reading correctly. Really strange. I took meter readings and times, so I'll go back in a week or so and compare the meter readings to Enlighten monitoring. All CTs are correct (I've corrected so many wrong ones at this point that I'm definitely expert level on that). On this site I actually have two conductors per CT because there is a meter/main combo feeding both a main panel inside the garage and a pool subpanel (3/0 and #6 conductors). I triple checked directionality and line matching. I removed the CTs, checked for the magnetic inserts, and reinstalled them. Everything checked out. I considered putting in parallel CTs, but it shouldn't be necessary.
To Dave Tedeyan's point, line-to-line matching results in the most errors we see in the field now. For example, Eaton main breakers criss-cross inside, so the lugs top and bottom are reversed. I always check the voltage across the line to load side of the main to double check. Now if Enphase would just change the wording of the CT measurement options in the Installer Toolkit we could all avoid those annoying errors. It should simply ask if the consumption CTs are on the load or line side of the interconnection point (breaker or tap). And while on the subject, let installers change the setting in the Toolkit! On Thu, Aug 16, 2018 at 11:53 AM William Miller <[email protected]> wrote: > Friends: > > I have seen utilities misappropriate values from their meter to the > billing. That might explain your discrepancies. > > William > > On Aug 16, 2018, at 7:57 AM, Lorenzo Ortiz <[email protected]> wrote: > > Fun fact: Sometimes the stickers on the CT's are incorrect too. Had that > happen and took forever to figure out... > > On Wed, Aug 15, 2018 at 4:10 PM, Kirpal <[email protected]> wrote: > >> Jason...not sure about the Enphase consumption monitoring, if it is done >> with CT's confirm that your CT's are facing the right direction. Some CT's >> are directional and perhaps your consumption monitoring could be backwards >> instead of the utility meter wiring backwards.....Seems like the utility >> would have noticed incorrect wiring in their can. >> We use the E Gauge CT clamps for some monitoring and they are >> directional. I am not familiar with the Enphase versions. >> >> >> Sunny Regards, >> Kirpal Khalsa >> Oregon LRT#25 >> NABCEP Certified PV Installation Professional >> Oregon Solarworks LLC >> www.oregonsolarworks.com >> 541-299-0402 >> >> On Wed, Aug 15, 2018 at 4:01 PM, Jason Szumlanski < >> [email protected]> wrote: >> >>> Is it possible for a utility meter to be programmed/wired backward? I >>> have a client on an Enphase system with production and consumption >>> monitoring, and the Enphase monitoring is showing solar production exceeded >>> consumption by 400 kWh for a billing period. However, the meter is reading >>> almost exactly the opposite. It seems too coincidental. >>> >>> I'm going to go out to the site tomorrow to shut down all of the loads >>> and see what happens when solar is only backfeeding the meter, but I'm >>> curious how the meters are "programmed" or set up to work. >>> >>> Note that the meter was zeroed to start and the initial billing period >>> readings show DEL exceeded REC by 400 kWh, which matches what was billed >>> (net usage of positive 400 kWh). >>> >>> Jason Szumlanski >>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> List Address: [email protected] >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> List-Archive: >>> http://www.mail-archive.com/[email protected]/maillist.html >>> >>> List rules & etiquette: >>> www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> www.members.re-wrenches.org >>> >>> >>> >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/[email protected]/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> >> >> > > > -- > *Lorenzo Ortiz Commercial PV Designer* > > [email protected]* (530) 274-3671* > > > > <http://californiasolarco.com/referral-program/> > *Showroom located at: 149 E Main St. Grass Valley, CA 95945* > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > >
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