<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue-Light, Helvetica Neue Light, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1448046083847_90243"><span id="yui_3_16_0_1_1448046083847_90242">Hi All,</span></div><div id="yui_3_16_0_1_1448046083847_90243"><span><br></span></div><div id="yui_3_16_0_1_1448046083847_90243"><span>My 2 cents.</span></div><div id="yui_3_16_0_1_1448046083847_90243"><span><br></span></div><div id="yui_3_16_0_1_1448046083847_90243"><span>UL1741 and IEEE 1547 talk about Anti Islanding requirements for grid interactive inverters. It is possible in theory, if the load on the grid exactly matched the pv production you could have an islanded situation. But as soon as the teeter totter tipped either way, the island collapses. </span></div><div id="yui_3_16_0_1_1448046083847_90241"><span><br></span></div><div id="yui_3_16_0_1_1448046083847_90240"><span id="yui_3_16_0_1_1448046083847_90239">I agree with Chris, if it were to happen, then the inverter manufacturer would be at fault. </span></div><div></div><div id="yui_3_16_0_1_1448046083847_90238"> </div><div class="signature" id="yui_3_16_0_1_1448046083847_89391">-Wes Kennedy
303-653-3073</div><br> <div style="font-family: HelveticaNeue-Light, Helvetica Neue Light, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1448046083847_89394"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1448046083847_89393"> <div dir="ltr" id="yui_3_16_0_1_1448046083847_89392"> <hr size="1"> <font size="2" face="Arial"> <b><span style="font-weight:bold;">From:</span></b> Chris Mason <cometenergysystems@gmail.com><br> <b><span style="font-weight: bold;">To:</span></b> RE-wrenches <re-wrenches@lists.re-wrenches.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Sunday, November 22, 2015 3:34 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [RE-wrenches] Inverter back feed liability<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1448046083847_89395"><br><div id="yiv9366533429"><div id="yui_3_16_0_1_1448046083847_90408"><div dir="ltr">As long as the inverter carries a UL listing, it is the manufacturer's liability.</div><div class="yiv9366533429gmail_extra" id="yui_3_16_0_1_1448046083847_90407"><br clear="none"><div class="qtdSeparateBR"><br><br></div><div class="yiv9366533429yqt4650307300" id="yiv9366533429yqtfd72814"><div class="yiv9366533429gmail_quote" id="yui_3_16_0_1_1448046083847_90406">On Sun, Nov 22, 2015 at 6:10 PM, <span dir="ltr"><<a rel="nofollow" shape="rect" ymailto="mailto:toddcory@finestplanet.com" target="_blank" href="mailto:toddcory@finestplanet.com">toddcory@finestplanet.com</a>></span> wrote:<br clear="none"><blockquote class="yiv9366533429gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;" id="yui_3_16_0_1_1448046083847_90410"><font face="arial" size="4"></font><div style="margin:0;padding:0;font-family:arial;font-size:14pt;word-wrap:break-word;" id="yui_3_16_0_1_1448046083847_90409">worst case scenario, a battery based inverter system trying to power the grid would immediately shutdown on overload as the "infinite load" of the grid would look like a dead short.</div>
<div style="margin:0;padding:0;font-family:arial;font-size:14pt;word-wrap:break-word;"> </div>
<div style="margin:0;padding:0;font-family:arial;font-size:14pt;word-wrap:break-word;">also, all utility workers treat lines as "live" and routinely short out feeders before working on them... so the likelihood of this being an issue is extremely tiny.</div>
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<div style="margin:0;padding:0;font-family:arial;font-size:14pt;word-wrap:break-word;">someone else would have to address the liability issue, but i imagine this is covered in the utility's net metering contract.</div>
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<div style="margin:0;padding:0;font-family:arial;font-size:14pt;word-wrap:break-word;">todd</div><div><div class="yiv9366533429h5">
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<div style="margin:0;padding:0;font-family:arial;font-size:14pt;word-wrap:break-word;"><br clear="none"><br clear="none">On Sunday, November 22, 2015 1:19pm, "gary easton" <<a rel="nofollow" shape="rect" ymailto="mailto:gary@arp-solar.com" target="_blank" href="mailto:gary@arp-solar.com">gary@arp-solar.com</a>> said:<br clear="none"><br clear="none"></div>
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<div dir="ltr">Hello Wrenches,
<div>I have an electrical engineer customer that asked me a "what if" that I had not heard before. If an inverter somehow back feeds the grid during an outage and damages something or hurts someone who is liable? <br clear="none">-- <br clear="none">
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<div dir="ltr"><span style="border-collapse:collapse;font-family:arial, sans-serif;font-size:13px;">Gary Easton<br clear="none">Appalachian Renewable Power</span>
<div><span style="border-collapse:collapse;font-family:arial, sans-serif;font-size:13px;">Stewart, Ohio 45778<br clear="none">NABCEP Certified Solar PV <br clear="none">T: <a rel="nofollow" shape="rect" style="color:#0658b5;" href="">740-277-8498</a></span>
<div><span style="border-collapse:collapse;font-family:arial, sans-serif;font-size:13px;"><a rel="nofollow" shape="rect" style="color:#0658b5;" href=""></a> <a rel="nofollow" shape="rect" target="_blank" href="http://www.arp-solar.com/">www.arp-solar.com</a></span></div>
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<h1 style="color:#003399;font-family:Arial, sans-serif;font-size:12px;margin:0px;">“First they ignore you. Then they laugh at you. Then they fight you. Then you win.”</h1>
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<br clear="none"></blockquote></div></div><br clear="none"><br clear="all"><div><br clear="none"></div>-- <br clear="none"><div class="yiv9366533429gmail_signature"><div dir="ltr">Chris Mason<div><div style="color:rgb(136,136,136);"><span style="font-size:13px;">NABCEP Certified Solar PV Installer™</span></div><div style="color:rgb(136,136,136);"><span style="color:rgb(34,34,34);">Solar Design Engineer</span></div><div style="color:rgb(136,136,136);"><span style="font-size:13px;">Generac Generators Industrial technician</span></div></div><div style="color:rgb(136,136,136);"><span style="font-size:13px;"><br clear="none"></span></div><div><a rel="nofollow" shape="rect" target="_blank" href="http://www.cometenergysystems.com/">www.cometsolar.com</a></div><div>264.235.5670</div><div>869.662.5670</div><div>Skype: netconcepts</div></div></div><div class="yiv9366533429yqt4650307300" id="yiv9366533429yqtfd57601">
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