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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">We have tied in the PV to operate when the generator is operating, but only on a very large generator when the PV output was very small compared to both generator
output and load (in which case it apparently looked like a reduction in load the to the genset, and actually saved some fuel). But I agree that there is significant potential for damage to the generator controls, etc., and would not validate or recommend
it.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Solectria has a nice white paper on the subject:
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><a href="http://solarprofessional.com/articles/products-equipment/inverters/q-a-interaction-of-grid-direct-inverters-with-backup">http://solarprofessional.com/articles/products-equipment/inverters/q-a-interaction-of-grid-direct-inverters-with-backup</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Also, discussions we’ve had with Enphase have been that it may be possible but would void the inverter warranty, which may well be the case with other inverter
manufacturers.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Lloyd Hoffstatter<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">NABCEP PV Installer, NY-Sun trainer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> RE-wrenches [mailto:re-wrenches-bounces@lists.re-wrenches.org]
<b>On Behalf Of </b>jay<br>
<b>Sent:</b> Tuesday, October 20, 2015 12:37 PM<br>
<b>To:</b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Subject:</b> Re: [RE-wrenches] Generator backfeeding enphase?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I don’t think you are missing anything.<o:p></o:p></p>
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<p class="MsoNormal">jay<o:p></o:p></p>
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<p class="MsoNormal">On Oct 20, 2015, at 9:01 AM, Howie Michaelson <<a href="mailto:howie@suncatchervt.com">howie@suncatchervt.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Does anyone think that there is no issue with having enphase potentially backfeeding a backup generator? We almost always will tie in upstream of a generator transfer switch, but
a competitor is telling clients with an enphase system there is no concern. Am I missing something?<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks,<br>
Howie<br>
Howie Michaelson<br>
NABCEP Certified Solar PV Installer™<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Catamount Solar<br>
Renewable Energy Systems Sales and Service<br>
VT Solar Electric Incentive Partner<br>
<a href="http://www.catamountsolar.com/">http://www.CatamountSolar.com</a><br>
802-272-0004<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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