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MI = microinverter</div>
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<b>Howard "Scot" Arey</b></div>
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<b>Owner, Solar CenTex</b></div>
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254-300-1228 </div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org> on behalf of Christopher Warfel via RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Sent:</b> Thursday, January 22, 2026 6:43 AM<br>
<b>To:</b> scot.arey--- via RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Cc:</b> Christopher Warfel <cwarfel@entech-engineering.com><br>
<b>Subject:</b> Re: [RE-wrenches] Will IQ8 microinverters backfeed a generator during grid interruptions</font>
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<p>Hi Scot, I am not familiar with the term MI, what does it mean? Thank you, Chris</p>
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<div class="x_moz-cite-prefix">On 1/21/2026 12:07 PM, scot.arey--- via RE-wrenches wrote:<br>
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Good day,</div>
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I many years ago watched the fast-switching capabilities of the IQ-8 microinverters to produce only what demanded of the MI, and wondered if it might have application in a grid-tied system that is served by a whole-house generator.</div>
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We have the opportunity to install grid-tied-only array of 24 IQ8 but all the MIs will be on the customer side of an auto-transfer switch and generator. We want to leverage using existing building wiring to carry the solar and all solar sizing meets the 120%
rules.</div>
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But I know that grid-tied solar on the customer load-side of the transfer switch means no place for full solar power production to flow to when the grid is not available...but then I thought back to that fast switching capability: is there a way to ensure
the IQ8 don't backfeed a generator when it is operating for a grid anomaly?<br>
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I suspect the answer is "are you nuts???" but that video of capability got me thinking, "why not?" and if not, how is it - what tells the MI to cease production? - when it is within a full and proper ISC/ESS system design?<br>
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<b>Howard "Scot" Arey</b></div>
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<b>Owner, Solar CenTex</b></div>
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NABCEP PV Installation Professional</div>
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TECL 29755</div>
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<pre class="x_moz-signature" cols="72">--
Christopher Warfel, PE
ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
(401) 447-5773</pre>
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