<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Currently up in the air as to whether 2020 will allow that on 1- and 2- family houses. If so then yes...currently don\u2019t know of any. <br><br><div id="AppleMailSignature" dir="ltr">Brian</div><div dir="ltr"><br>On Sep 18, 2018, at 2:45 PM, Jay <<a href="mailto:jay.peltz@gmail.com">jay.peltz@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="content-type" content="text/html; charset=utf-8"><div></div><div>Does anyone make a 1000vdc single phase inverter?</div><div>Would reduce wire costs dramatically </div><div><br></div><div>Jay</div><div>Peltz power. </div><div><br>On Sep 18, 2018, at 11:36 AM, Lorenzo Ortiz <<a href="mailto:lorenzo@cal-solar.com">lorenzo@cal-solar.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">Thanks for all the input guys. After looking at the 3 phase with transformer options with some transformer manufacturers, that has been pretty much ruled out due to complexity/cost. <div>With single phase step-up and step-down transformers, even at 600VAC, it still requires some monster wire.</div><div>The best solution seems to be placing the inverters next to the POI and just running long strings from the array back to the inverters and accepting up to 4%-5% voltage drop. And that's with #8 instead of the usual #10 AND accounting for worst-case production.</div><div><br></div><div>Man, sometimes this solar stuff is just crazy...</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Sep 18, 2018 at 10:15 AM, Blake Gleason <span dir="ltr"><<a href="mailto:blake@sunlightandpower.com" target="_blank">blake@sunlightandpower.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="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"><div><div class="h5"><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="m_-5691845545347230168HOEnZb"><font color="#888888"><div dir="auto">Jerry</div></font></span></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="m_-5691845545347230168h5">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_-5691845545347230168m_8415257343724667551quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="m_-5691845545347230168h5"><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>
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