<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif">I agree with needing to read the center-tap paper. However, we have found that it's sometimes just as easy and cost effective to use shorter strings and combine in AC load centers for a run to the interconnection point. It depends on the layout and how many splices and j-boxes you would need.</div>
<div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Come to think of it... that really applies more to 240Vac service. 3-pole breakers and panels are more pricey.</div>
<br><div id="WISESTAMP_SIG_gmail_session"><div style="font-size:13px;font-family:Verdana,Arial,Helvetica,sans-serif"><div style="margin:0 0 8px 0"><p style="margin:0"><span><span>Jason</span></span></p><div class="gmail_default" style="font-family:verdana,sans-serif;display:inline">
Szumlanski</div><p></p><p style="margin:0"><span><span></span></span></p><div class="gmail_default" style="font-family:verdana,sans-serif;display:inline">Fafco Solar</div><br> <p></p><div style="clear:both"></div></div>
</div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Oct 3, 2013 at 3:53 PM, Holt Kelly <span dir="ltr"><<a href="mailto:Holtek@sbcglobal.net" target="_blank">Holtek@sbcglobal.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div bgcolor="white" lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Be sure to read Enphase’s tech sheet on center tap of branch circuits. <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><div><p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Estrangelo Edessa";color:#1f497d">Holt E. Kelly<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Estrangelo Edessa";color:#1f497d">Holtek Fireplace & Solar Products<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Estrangelo Edessa";color:#1f497d">500 Jewell Dr.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Estrangelo Edessa";color:#1f497d">Waco, TX 76712<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Estrangelo Edessa";color:#1f497d"><a href="http://www.holteksolar.com/" target="_blank"><span style="color:#0563c1">www.holteksolar.com</span></a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Estrangelo Edessa";color:#1f497d"><a href="tel:254-751-9111" value="+12547519111" target="_blank">254-751-9111</a><u></u><u></u></span></p></div><p class="MsoNormal">
<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><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""> <a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a> [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Nathan Stumpff<br>
<b>Sent:</b> Thursday, October 03, 2013 2:28 PM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] Enphase commercial<u></u><u></u></span></p></div></div><div><div class="h5"><p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hi Eric,<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">It is 25 inverters on a 20A circuit, but only on 208 three phase. Each micro connects to the cable in an alternating way (L1/L2, then L2/L3, then L3/L1, etc.) so with 25 micros there are either 8 or 9 micros on each combination.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">9 x 1.0 A x 1.732 (square root of 3) x 1.25 = 19.48 A = 20 A breaker<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Cheers,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">-Nathan<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">--<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Nathan J. Stumpff<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">NABCEP Certified PV Installation Professional #091209-175<u></u><u></u></span></p><p class="MsoNormal">
<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">NABCEP Certified Solar Heating Installer #032412-14<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Project Manager | Arctic Sun, LLC<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="mailto:nathan@arcticsun-llc.com" target="_blank">nathan@arcticsun-llc.com </a> | <a href="tel:%28907%29%20457-1297" value="+19074571297" target="_blank">(907) 457-1297</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="http://www.reina-llc.com/" target="_blank">www.reina-llc.com</a> | <a href="http://www.arcticsun-llc.com/" target="_blank">www.arcticsun-llc.com</a><u></u><u></u></span></p>
<p class="MsoNormal"><a href="http://www.facebook.com/ArcticSunLLC" target="_blank"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";text-decoration:none"><img border="0" width="30" height="30" alt="Description: ZA102637861"></span></a><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u><u></u></span></p>
</div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></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""> <a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a> [<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>SunHarvest<br>
<b>Sent:</b> Thursday, October 03, 2013 10:52 AM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> [RE-wrenches] Enphase commercial<u></u><u></u></span></p></div></div><p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal">
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Hey Wrenches & Nick Soleil (with whom I worked at APS for a time I believe...),</span><u></u><u></u></p></div><div><p class="MsoNormal">
<u></u><u></u></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">I'm not familiar with Enphase commercial applications and am currently working through a commercial design. Enphase, on their M215 datasheets claim up to 25 micros per branch, at 1.0A each, with each branch terminating at a 20A breaker. By my calculations, 25 micros at 1.0A each (25A*1.25=31.25A) need to terminate at a 40A breaker. Anyone know what I'm missing or know how the 20A breaker design gets past the AHJ?</span><u></u><u></u></p>
</div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">Eric Stikes<br>SunHarvest<u></u><u></u></p></div><div><p class="MsoNormal"><a href="tel:%28530%29%20798-3738" value="+15307983738" target="_blank">(530) 798-3738</a><u></u><u></u></p>
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