<div dir="ltr">Good advice already on this thread. A couple of points to consider:<div><br></div><div>1. Re: step-up/step-down option (probably what I'd do): definitely pay attention to transformer spec to minimize both magnetization and operating losses. Newer DOE 2016-compliant transformers are MUCH better than before, and that's just the minimum standard. If you really want to minimize magnetization losses, you can always design a relay/timer to disconnect the transformers at night (from the interconnection side), although I've found that this setup is either very expensive or too unreliable (nuisance tripping upon re-connect, timer gets "off" cycle somehow, etc).</div><div><br></div><div>2. I think someone mentioned a 480V single-phase inverter. I'm not aware of a high-quality product meeting that description. Is there one? All of the "480V" single-phase inverters I'm aware of are 277V (line to neutral), which is hardly worth the transformer effort (versus 240V).</div><div><br></div><div>3. Definitely use aluminum wire for the long run. If wire size is still too large, even with step up/down tranformers, consider allowing slightly increased voltage drop at full power (say, 5%), and, depending on typical grid voltage at the site, change taps on one of the transformers to err on the low side (from inverters' point-of-view), to keep the inverters from tripping at upper voltage limit at full power (max voltage drop/rise).</div><div><br></div><div><br></div><div>Blake</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Sep 18, 2018 at 9:57 AM, Jerry Shafer <span dir="ltr"><<a href="mailto:jerrysgarage01@gmail.com" target="_blank">jerrysgarage01@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">Lorenzo<div dir="auto">You might want to look at relocating the inverter(s) closer to the meter instead of the array, one reason is even if there is some line loss at full power its less as the voltage goes up and the inverter does not see the line resistance that can cause high voltage issues at the inverter. Some engineers use more side of peak performance than full power, this keeps wite size down and does not effect output</div><span class="HOEnZb"><font color="#888888"><div dir="auto">Jerry</div></font></span></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Sep 17, 2018 9:42 AM, "Lorenzo Ortiz" <<a href="mailto:lorenzo@cal-solar.com" target="_blank">lorenzo@cal-solar.com</a>> wrote:<br type="attribution"></div></div><blockquote class="m_8415257343724667551quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr">
<span style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Wrenches,</span><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial">We have a PV array situated about 900' from the POI (240V 1PH). We initially spec'd (5) 11.4kW inverters and the combined output would be 238A. The wire size required for this current over that distance is cost prohibitive.</div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial">A solution was to use a single 50kW 3 phase inverter at the array and then convert it to 240V... somehow? Is anyone familiar with how to go about doing this? My thought was to have a step down transformer at the POI and pull off two legs to get 240V. Is this even a thing?</div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial">The other, more expensive option is to use a step up transformer at the array and a step down at the POI to get us a smaller wire size.</div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial">Thanks for any input.</div>
<br clear="all"><div><br></div>-- <br><div class="m_8415257343724667551m_-581464140629756719gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><span style="background-color:rgb(255,255,255)"><font color="#0b5394"><u style="font-weight:bold">Loren Ortiz Commercial PV Designer</u></font></span></div><div><span style="background-color:rgb(255,255,255)"><font color="#0b5394"><u style="font-weight:bold"><br></u></font></span></div><div><span style="background-color:rgb(255,255,255)"><font color="#0b5394"><b> </b> <a href="mailto:lorenzo@cal-solar.com" rel="noreferrer" target="_blank">loren@cal-solar.com</a><b> (530) 274-3671</b></font></span></div> <img src="https://docs.google.com/uc?export=download&id=0B6l5VcsZgAv3TXRfSkhpZUNaczQ&revid=0B6l5VcsZgAv3djFpMk9EQUdEdmg1K0hFdHBNZVlTZ3RZdW5VPQ"><br><div><br></div></div></div></div></div></div></div></div></div></div></div></div></div>
</div>
<br>
<div style="text-align:left"><a href="http://californiasolarco.com/referral-program/" rel="noreferrer" target="_blank"><img src="http://californiasolarco.com/wp-content/uploads/2018/06/CalSolarADVOCATE.png" style="font-size:1.3em"></a></div><div style="text-align:left"><b style="color:rgb(153,153,153);font-size:12.6667px;white-space:pre-wrap;background-color:rgb(255,255,255);font-family:arial,helvetica,sans-serif">Showroom located at: 149 E Main St. Grass Valley, CA 95945</b></div></div></div><span class="">______________________________<wbr>_________________<br>
List sponsored by Redwood Alliance<br>
<br>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" rel="noreferrer" target="_blank">RE-wrenches@lists.re-wrenches.<wbr>org</a><br>
<br>
Change listserver email address & settings:<br>
<a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" rel="noreferrer noreferrer" target="_blank">http://lists.re-wrenches.org/<wbr>options.cgi/re-wrenches-re-<wbr>wrenches.org</a><br>
<br>
List-Archive: <a href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html" rel="noreferrer noreferrer" target="_blank">http://www.mail-archive.com/<wbr>re-wrenches@lists.re-wrenches.<wbr>org/maillist.html</a><br>
<br>
List rules & etiquette:<br>
<a href="http://www.re-wrenches.org/etiquette.htm" rel="noreferrer noreferrer" target="_blank">www.re-wrenches.org/etiquette.<wbr>htm</a><br>
<br>
Check out or update participant bios:<br>
<a href="http://www.members.re-wrenches.org" rel="noreferrer noreferrer" target="_blank">www.members.re-wrenches.org</a><br>
<br>
</span></blockquote></div><br></div>
<br>______________________________<wbr>_________________<br>
List sponsored by Redwood Alliance<br>
<br>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.<wbr>org</a><br>
<br>
Change listserver email address & settings:<br>
<a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/<wbr>options.cgi/re-wrenches-re-<wbr>wrenches.org</a><br>
<br>
List-Archive: <a href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html" rel="noreferrer" target="_blank">http://www.mail-archive.com/<wbr>re-wrenches@lists.re-wrenches.<wbr>org/maillist.html</a><br>
<br>
List rules & etiquette:<br>
<a href="http://www.re-wrenches.org/etiquette.htm" rel="noreferrer" target="_blank">www.re-wrenches.org/etiquette.<wbr>htm</a><br>
<br>
Check out or update participant bios:<br>
<a href="http://www.members.re-wrenches.org" rel="noreferrer" target="_blank">www.members.re-wrenches.org</a><br>
<br>
<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><br><br><br><br><table cellpadding="7" cellspacing="0" width="400px"> <tr valign="top"> <td style="font-family:Calibri,Candara,Segoe,Segoe UI,Optima,Arial,sans-serif;color:#606060;font-size:10pt;padding-right:12px;border-right:2px solid #606060"><a href="http://www.sunlightandpower.com/" target="_blank"><img src="http://sunlightandpower.com.hosted-content.com/v2/imagebucket/sunlightandpower.com/SLP_tagline_white_background.png" style="width:170px"></a> <table cellpadding="0" cellspacing="0"><td><br> <tr><td></td> <td style="width:17px;padding:5px 3px 0 0"><br> <a href="https://www.bcorporation.net/what-are-b-corps/why-b-corps-matter" target="_blank"> <img height="35" src="http://sunlightandpower.com.hosted-content.com/v2/imagebucket/sunlightandpower.com/slpbcorp.png"></a> </td> <td style="width:17px;padding:5px 3px 0 0"><br> <a href="http://www.greenbiz.ca.gov/AboutUsAC.html" target="_blank"> <img height="35" src="http://sunlightandpower.com.hosted-content.com/v2/imagebucket/sunlightandpower.com/slpgreenbusiness.png"></a> </td><td style="width:17px;padding:5px 3px 0 0"><br> <a href="https://www.yelp.com/biz/sunlight-and-power-berkeley" target="_blank"><img height="25" src="http://sunlightandpower.com.hosted-content.com/v2/imagebucket/sunlightandpower.com/slpyelp.png"></a> </td><td style="width:17px;padding:5px 3px 0 0"><br> <a href="https://www.facebook.com/SunLightandpower/" target="_blank"> <img height="25" src="http://sunlightandpower.com.hosted-content.com/v2/imagebucket/sunlightandpower.com/slpfacebook-square.png"></a> </td><td style="width:17px;padding:5px 3px 0 0"><br> <a href="https://plus.google.com/+SunLightPowerBerkeley" target="_blank"> <img height="25" src="http://sunlightandpower.com.hosted-content.com/v2/imagebucket/sunlightandpower.com/slpgoogleplus-square.png"></a> </td><td style="width:17px;padding:5px 3px 0 0"><br> <a href="https://www.linkedin.com/company/sunlightandpower" target="_blank"> <img height="25" src="http://sunlightandpower.com.hosted-content.com/v2/imagebucket/sunlightandpower.com/slplinkedin.png"></a> </td><td style="width:17px;padding:5px 3px 0 0"><br> <a href="https://www.youtube.com/channel/UCT9wyMAwre0RW8QnR-Hx3Mw" target="_blank"> <img height="25" src="http://sunlightandpower.com.hosted-content.com/v2/imagebucket/sunlightandpower.com/slpyoutube.png"></a> </td></tr></td></table></td> <td> <table cellpadding="2" cellspacing="0" width="300px"> <tr> <td style="font-family:Calibri,Candara,Segoe,Segoe UI,Optima,Arial,sans-serif;color:#eaab3b;font-size:14pt;padding-left:12px;line-height:12pt"><b> Blake Gleason</b><span style="font-family:Calibri,Candara,Segoe,Segoe UI,Optima,Arial,sans-serif;color:#eaab3b;font-size:12pt;text-decoration:none"> - PE, LEED AP<br><b>Director of Innovation & Technical Excellence</b></span></td> </tr> <tr> <td style="font-family:Calibri,Candara,Segoe,Segoe UI,Optima,Arial,sans-serif;color:#eaab3b;text-decoration:none;font-size:10pt;padding-left:12px"><br> <b>P:</b> <a href="tel:510.845.2997+x128" style="font-family:Calibri,Candara,Segoe,Segoe UI,Optima,Arial,sans-serif;color:#222222;text-decoration:none" target="_blank"> 510.845.2997 x128 </a><br> <b>E:</b><a href="mailto:blake@sunlightandpower.com" style="color:#222222;text-decoration:none" target="_blank"> blake@sunlightandpower.com</a> <br><b>W:</b> <a href="http://www.sunlightandpower.com" style="color:#222222;text-decoration:none" target="_blank">sunlightandpower.com</a><br> </td></tr> <tr><td style="font-family:Calibri,Candara,Segoe,Segoe UI,Optima,Arial,sans-serif;color:#eaab3b;text-decoration:none;font-size:10pt;padding-left:12px;vertical-align:bottom"><br><a href="http://smart.sunlightandpower.com/vsig/blake/slpbanner.html" style="color:#df1b28;font-weight:bold;font-family:Calibri,Candara,Segoe,Segoe UI,Optima,Arial,sans-serif;text-decoration:none" target="_blank">See how universities are using business as a force for good with solar!</a></td></tr> </table> </td> </tr> </table> <table><tr> <td height="10px;"></td> </tr></table></div>
</div>