<div dir="ltr">T<font size="4">he single phase - 3phase change is too difficult and expensive. Stay with single phase. I have done this successfully with a step up and down transformer. You, of course, need to select the correct transformer. Transformers seem to have a price advantage using standard voltages. For example, starting at building 240 to 480 and then use 480-volt inverters. This will require longer strings for the 480-volt single phase inverter. another way is to use 240 to 240-480-volt and carry a neutral. then select inverters that can operate with no neutral, I call them floating output. This cuts current in half, voltage drop or rise by 1/4 allowing smaller wire. </font></div><br><div class="gmail_quote"><div dir="ltr">On Mon, Sep 17, 2018 at 11:42 AM Lorenzo Ortiz <<a href="mailto:lorenzo@cal-solar.com">lorenzo@cal-solar.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><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_-9046401007817724644gmail_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" 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>
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