<div dir="ltr">DRakes suggestion has the advantage of the DC side is not a voltage sensitive as the AC side and voltage drop is not as critical. allowing perhaps a 3% </div><br><div class="gmail_quote"><div dir="ltr">On Mon, Sep 17, 2018 at 12:50 PM <<a href="mailto:drake.chamberlin@redwoodalliance.org" target="_blank">drake.chamberlin@redwoodalliance.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="font-family:Helvetica,Arial,sans-serif;font-size:12px">Another option would be to locate the inverters near the grid and run the DC at as high a voltage as possible. Have a separate run of wire for each of the 5 inverters. If you ran the DC at 500 V, an 11.4 kW inverter would only draw 22.8. A. Use 2/0 AL for a little over 1% VD at full power. <br><br><br><blockquote class="m_4656400053321954663m_2707036534326397802atmailquote"><br>----- Original Message -----<br><div id="m_4656400053321954663m_2707036534326397802origionalMessageFromField" style="width:100%;display:inline;background:rgb(228,228,228)"><div style="display:inline;font-weight:bold">From:</div> "RE-wrenches" <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>></div><br><div id="m_4656400053321954663m_2707036534326397802origionalMessageToField" style="display:inline;font-weight:bold">To:</div>"RE-wrenches" <<a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a>><br><div id="m_4656400053321954663m_2707036534326397802origionalMessageSentField" style="display:inline;font-weight:bold">Cc:</div><br><div style="display:inline;font-weight:bold">Sent:</div>Mon, 17 Sep 2018 09:42:01 -0700<br><div id="m_4656400053321954663m_2707036534326397802origionalMessageSubjectField" style="display:inline;font-weight:bold">Subject:</div>[RE-wrenches] Step-up/Step-down Transformer question<br><br><br><div dir="ltr">
<span style="font-size:12.8px;float:none;display:inline">Wrenches,</span><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">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"><br></div><div style="font-size:12.8px">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"><br></div><div style="font-size:12.8px">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"><br></div><div style="font-size:12.8px">Thanks for any input.</div>
<br style="clear:both"><div><br></div>-- <br><div class="m_4656400053321954663m_2707036534326397802gmail_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)"><span style="color:#0b5394"><span style="text-decoration:underline;font-weight:bold">Loren Ortiz Commercial PV Designer</span></span></span></div><div><span style="background-color:rgb(255,255,255)"><span style="color:#0b5394"><span style="text-decoration:underline;font-weight:bold"><br></span></span></span></div><div><span style="background-color:rgb(255,255,255)"><span style="color:#0b5394"><b> </b> <a href="mailto:lorenzo@cal-solar.com" target="_blank">loren@cal-solar.com</a><b> (530) 274-3671</b></span></span></div> <br><div><br></div></div></div></div></div></div></div></div></div></div></div></div></div>
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