<div dir="ltr">Jason,<div><br></div><div>In our territory the utility (PG&E) starting switching to digital smart meters five to ten years ago. In order to function properly with a PV system, meters need to be programmed for Net Energy Metering (NEM). If you run a PV system prior to receiving Permission To Operate (PTO) from the utility, backfed energy may actually register as energy consumed by the property. The meter will still show a little arrow to the left (meaning backfeeding to grid) but they will bill you as if that energy was being consumed. I can't say that all meters work this way, but I can verify that it has happened when some of our customers jumped the gun and turned on their system prior to receiving PTO. This could be a totally separate issue from what you're seeing, but thought I'd just chime in.</div><div><br></div><div>Best,</div><div><br></div><div>August</div><div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr">
<p> </p></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Thu, Aug 16, 2018 at 2:44 PM Jason Szumlanski <<a href="mailto:jason@floridasolardesigngroup.com">jason@floridasolardesigngroup.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">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.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">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.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">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!</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div><div dir="ltr" class="m_-2238853200884758793gmail_signature"><div dir="ltr"><div dir="ltr"><table border="0" cellpadding="0" cellspacing="0" style="font-family:"helvetica neue",helvetica,arial,sans-serif"><tbody><tr><td rowspan="2"><br></td><td rowspan="2"></td></tr></tbody></table></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr">On Thu, Aug 16, 2018 at 11:53 AM William Miller <<a href="mailto:william@millersolar.com" target="_blank">william@millersolar.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div></div><div>Friends:</div><div><br></div><div>I have seen utilities misappropriate values from their meter to the billing. That might explain your discrepancies. </div><div><br></div><div>William</div><div><br>On Aug 16, 2018, at 7:57 AM, Lorenzo Ortiz <<a href="mailto:lorenzo@cal-solar.com" target="_blank">lorenzo@cal-solar.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">
<span style="font-size:small;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Fun fact: Sometimes the stickers on the CT's are incorrect too. Had that happen and took forever to figure out...</span>
<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Aug 15, 2018 at 4:10 PM, Kirpal <span dir="ltr"><<a href="mailto:solarworks@gmail.com" target="_blank">solarworks@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">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.<div>We use the E Gauge CT clamps for some monitoring and they are directional. I am not familiar with the Enphase versions.</div><div><br></div><div class="gmail_extra"><br clear="all"><div><div class="m_-2238853200884758793m_-6337286755100644102m_-2209813984101685517gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr">Sunny Regards,<br>Kirpal Khalsa</div><div dir="ltr">Oregon LRT#25<br>NABCEP Certified PV Installation Professional<br>Oregon Solarworks LLC<br><a href="http://www.oregonsolarworks.com" target="_blank">www.oregonsolarworks.com</a><br>541-299-0402</div></div></div></div></div></div></div>
<br><div class="gmail_quote"><div><div class="m_-2238853200884758793m_-6337286755100644102h5">On Wed, Aug 15, 2018 at 4:01 PM, Jason Szumlanski <span dir="ltr"><<a href="mailto:jason@floridasolardesigngroup.com" target="_blank">jason@floridasolardesigngroup.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="m_-2238853200884758793m_-6337286755100644102h5"><div dir="ltr"><div style="font-family:arial,helvetica,sans-serif">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.</div><div style="font-family:arial,helvetica,sans-serif"><br></div><div style="font-family:arial,helvetica,sans-serif">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.</div><div style="font-family:arial,helvetica,sans-serif"><br></div><div style="font-family:arial,helvetica,sans-serif">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). </div><span class="m_-2238853200884758793m_-6337286755100644102m_-2209813984101685517HOEnZb"><font color="#888888"><div style="font-family:arial,helvetica,sans-serif"><br></div><div style="font-family:arial,helvetica,sans-serif">Jason Szumlanski</div><div><div dir="ltr" class="m_-2238853200884758793m_-6337286755100644102m_-2209813984101685517m_5000109842380418413gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div></div></div></div></div></font></span></div>
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