<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Clarification - it's square root of 3, not 2, and if the Inverter Output Current is specified on a datasheet for a 3-phase inverter, it would already have the factor applied and that is the rating used to apply to 1.25x factor.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">For example, Sunny Tripower 12,000 has a inverter output rating of:</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">12000 / 480 / sqrt(3) = 14.43 (listed as 14.5). Multiply the number of inverters times 14.5 times 1.25 to get the combined OCPD and wire rating required.</div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><span><br><div dir="ltr" style="margin-left:0pt"></div></span></div></div></div></div></div></div></div></div></div></div>
<br><div class="gmail_quote">On Sat, Oct 24, 2015 at 8:39 AM, Glenn Burt <span dir="ltr"><<a href="mailto:glenn.burt@glbcc.com" target="_blank">glenn.burt@glbcc.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div style="font-family:Calibri,sans-serif;font-size:11pt">Two things,<br>Combined OCPD sizing is based on the output current of the inverters, not the individual OCPD values.<br>And in most 3 phase systems you will have a square root of 2 to factor into your calculations.<br><br>Sincerely,<br>Glenn Burt<br>Sent from my 'smart' phone so please excuse grammar and typos.</div></div><div dir="ltr"><hr><span style="font-family:Calibri,sans-serif;font-size:11pt;font-weight:bold">From: </span><span style="font-family:Calibri,sans-serif;font-size:11pt"><a href="mailto:amfrish@aeonsolar.com" target="_blank">Allen Frishman</a></span><br><span style="font-family:Calibri,sans-serif;font-size:11pt;font-weight:bold">Sent: </span><span style="font-family:Calibri,sans-serif;font-size:11pt">10/24/2015 7:50</span><br><span style="font-family:Calibri,sans-serif;font-size:11pt;font-weight:bold">To: </span><span style="font-family:Calibri,sans-serif;font-size:11pt"><a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches</a></span><br><span style="font-family:Calibri,sans-serif;font-size:11pt;font-weight:bold">Subject: </span><span style="font-family:Calibri,sans-serif;font-size:11pt">[RE-wrenches] Combined Inverter Fuse sizing</span><br><br></div><div><div class="h5">Wrencher's,<div>Quick question regarding sizing the fuse for a combined group of inverters. If I have six 10KW three phase inverters each with a max AC current of 30A they each require a 3 pole 40 A breaker. If I then take the combined output of the AC combiner panel I see two possible options for sizing the combined fuse size. </div><div><br></div><div>6 inverters x 40A breakers each = 240A so I need to use a 250A fuse</div><div>6 Inverters x 30A max output each = 180A x 1.25 = 225A Fuse</div><div><br></div><div>Seems like both are acceptable options since all wire will be protected.</div><div><br></div><div>All feedback is appreciated.<br><div>
<span style="color:rgb(0,0,0);text-transform:none;text-indent:0px;letter-spacing:normal;word-spacing:0px;white-space:normal;border-collapse:separate"><div><p class="MsoNormal"><i><span style="color:black;font-size:10.5pt">Al Frishman</span></i><span style="color:black;font-size:13.5pt"><br></span><span style="color:rgb(3,1,0);font-size:13.5pt">Aeon</span><span style="color:rgb(255,151,0);font-size:13.5pt">Solar</span><span style="color:black;font-size:13.5pt"></span></p><p class="MsoNormal"><i><span style="color:black;font-size:10.5pt"><a href="tel:%28917%29%20699-6641" value="+19176996641" target="_blank">(917) 699-6641</a> - cell</span></i><span style="color:black;font-size:10.5pt"><br></span><i><span style="color:black;font-size:10.5pt"><a href="tel:%28888%29%20460-2867" value="+18884602867" target="_blank">(888) 460-2867</a></span></i><span style="color:black;font-size:10.5pt"><br></span><i><span style="color:black;font-size:10.5pt"><a href="http://www.aeonsolar.com/" target="_blank">www.aeonsolar.com</a></span></i></p></div></span>
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