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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Karl,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>What you are referring to is a “reverse power relay.” These are common devices used for customer-generators. Basler is one company that makes them. Just google the topic and you will find several companies. The utility may have a preferred product so go with them if they have one. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>There are a few PV installations with these devices. It simply sends a signal to trip a relay at the inverter if reverse power is ever measured at the service entrance. It sounds like it is unlikely the device will get much use except on very special occasions when there servers are offline.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Bill.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Karl Jaeger<br><b>Sent:</b> Tuesday, February 15, 2011 3:41 PM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] "Keep that there PV off my grid!"<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><span style='color:#1F497D'>Dana,</span><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'>This is an instant excess situation, not one electron.</span><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'>I am not sure if this violates federal regulations, but you make a valid point. I will have to look into it.</span><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'>Honestly, there is a very small probability that any PV will ever make it to the grid. The service is 1000 Amps and the building has multiple servers running continuously, all day every day. I am hoping to forego the dumpload option and the added costs. Word is, they will begin discussions in the coming months addressing this issue. In the case that they decide to allow it, it would be an easy fix to remove the contactor and splice the conductors. </span><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'>I have heard rumors that a contactor like I described does in fact exist. But that was some years ago and I cannot remember the details.</span><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'>Thanks,</span><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;color:#1F497D'>Karl Jaeger</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;color:#1F497D'>Operations Manager</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;color:#1F497D'>LightWave Solar Electric</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;color:#1F497D'><a href="http://www.lightwavesolar.com">www.lightwavesolar.com</a></span><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal><a name="_MailOriginal"><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b></a><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Dana<br><b>Sent:</b> Tuesday, February 15, 2011 4:31 PM<br><b>To:</b> 'RE-wrenches'<br><b>Subject:</b> Re: [RE-wrenches] "Keep that there PV off my grid!"</span><o:p></o:p></p></div></div><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>Karl – </span><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>Is this instant excess or excess during a specific billing period?</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>Does this violate Federal regulations?</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>Could you divert or bank the excess in process heat, water pumping, or some other function?</span><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Century Gothic","sans-serif"'>Dana Orzel</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Century Gothic","sans-serif"'>Great Solar Works, Inc</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Century Gothic","sans-serif"'>E - </span><a href="mailto:dana@solarwork.com"><span style='font-size:12.0pt;font-family:"Century Gothic","sans-serif"'>dana@solarwork.com</span></a><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Century Gothic","sans-serif"'>V - 970.626.5253</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Century Gothic","sans-serif"'>F - 970.626.4140</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Century Gothic","sans-serif"'>C - 970.209.4076</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Century Gothic","sans-serif"'>web - </span><a href="http://www.solarwork.com" target="_blank"><span style='font-size:12.0pt;font-family:"Century Gothic","sans-serif"'>www.solarwork.com</span></a><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Century Gothic","sans-serif"'>"Responsible Technologies for Responsible People since 1988"</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Century Gothic","sans-serif"'>Do not ever believe anything, but seriously trust through action.</span><o:p></o:p></p></div><p class=MsoNormal> <o:p></o:p></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Karl Jaeger<br><b>Sent:</b> Tuesday, February 15, 2011 3:21 PM<br><b>To:</b> re-wrenches@lists.re-wrenches.org<br><b>Subject:</b> [RE-wrenches] "Keep that there PV off my grid!"</span><o:p></o:p></p></div></div><p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'>Greetings Esteemed Wrenches,<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'>My company was recently tasked to engineer a PV project in Alabama. We sat down for a meeting with all of the local big-shots. They proceeded to let us know that we are not allowed to feed any excess PV power onto their grid, production cannot exceed demand. I am hoping that y’all might be able to steer me towards a contactor assembly or device that would detect reverse current flow, trigger the contactor, then open up the inverter AC output circuit. The service is 3-phase, 208 volt. The maximum current we intend to introduce is 70 amps, continuous.<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'>Appreciate your advice,<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'>Karl Jaeger<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'>Operations Manager<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'>LightWave Solar Electric<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><a href="http://www.lightwavesolar.com" target="_blank">www.lightwavesolar.com</a><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p></div></div></body></html>