<div dir="ltr">Hi All -<div><br></div><div>I just bumped into this 14 kW unit from Solectria which is 3 phase 208 v:</div><div><br></div><div><a href="http://www.solren.com/products-and-services/grid-tied-solar-inverters/three-phase-transformerless-string-inverters/pvi-14-20tl-three-phase-transformerless-string-inverters/">http://www.solren.com/products-and-services/grid-tied-solar-inverters/three-phase-transformerless-string-inverters/pvi-14-20tl-three-phase-transformerless-string-inverters/</a><br>
</div><div><br></div><div>I haven't tried these but thought they might be worth checking out. -August</div></div><div class="gmail_extra"><br clear="all"><div><div dir="ltr"><p><b><span style="font-size:9.0pt;font-family:"Century Gothic","sans-serif"">August Goers</span></b></p>


<p><span style="font-size:8.0pt;font-family:"Century Gothic","sans-serif"">Principal</span></p><p><span style="font-size:8.0pt;font-family:"Century Gothic","sans-serif"">Luminalt Energy Corporation</span></p>
<p><span style="font-size:8.0pt;font-family:"Century Gothic","sans-serif"">o: 415.641.4000</span></p><p><span style="font-size:8.0pt;font-family:"Century Gothic","sans-serif"">m: 415.559.1525</span></p>


<p><span style="font-size:8.0pt;font-family:"Century Gothic","sans-serif""><a href="http://www.luminalt.com" target="_blank">www.luminalt.com</a></span></p>

<p> </p></div></div>
<br><br><div class="gmail_quote">On Fri, Oct 18, 2013 at 9:45 AM, August Goers <span dir="ltr"><<a href="mailto:august@luminalt.com" target="_blank">august@luminalt.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hi Bill -</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thanks, this is helpful info. Do you know how to calculate or approximate how we would keep the unbalanced voltage to less than 3%? I guess I need to check out ANSI/C84.1-2011 but I thought maybe there are some ballpark rules of thumb.</span></p>

<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thanks,</span></p>

<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">August</span></p>

<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>

<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:#1f497d">August Goers</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"></span></p>

<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#1f497d">Luminalt Energy Corporation</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"></span></p>

<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#1f497d">o: <a href="tel:415.641.4000" value="+14156414000" target="_blank">415.641.4000</a></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#1f497d">m: <a href="tel:415.559.1525" value="+14155591525" target="_blank">415.559.1525</a></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"></span></p>

<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal">
<b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a> [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Bill Brooks<br>

<b>Sent:</b> Friday, October 18, 2013 9:27 AM<br><b>To:</b> 'RE-wrenches'<br><b>Subject:</b> Re: [RE-wrenches] smaller 3-phase commercial inverters</span></p></div></div><div><div class="h5"><p class="MsoNormal">
 </p><p class="MsoNormal">
<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Marco,</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>

<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Besides the good responses you have already received, 20-30kW, 480V machines are really targeting larger installations that would be on facilities with 480V. I would generally not build a system with 480V inverters on a 208V service. For large systems, there are large inverters running at 208V, for small systems there are plenty of single-phase units that would work just fine. Incidentally, read the new NEC 705.100 in the 2014 code. It clarifies that utilities should not be disallowing single-phase units on a 3-phase service. The typical utility concerns do not understand how the equipment works.</span></p>

<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:10.0pt;font-family:Times-Bold">(A) Single Phase. </span></b><span style="font-size:10.0pt;font-family:Times-Roman">Single-phase inverters for hybrid systems</span></p>

<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Times-Roman">and ac modules in interactive hybrid systems shall be</span></p><p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Times-Roman">connected to three-phase power systems in order to limit</span></p>

<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Times-Roman">unbalanced voltages to not more than 3 percent.</span></p><p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Times-Roman"> </span></p>

<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt;font-family:Times-Roman">Informational Note: For utility-interactive single-phase inverters,</span></p><p class="MsoNormal" style="text-autospace:none">

<span style="font-size:9.0pt;font-family:Times-Roman">unbalanced voltages can be minimized by the same</span></p><p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt;font-family:Times-Roman">methods that are used for single-phase loads on a three- phase</span></p>

<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt;font-family:Times-Roman">power system. See ANSI/C84.1-2011, </span><i><span style="font-size:9.0pt;font-family:Times-Italic">Electric Power Systems</span></i></p>

<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:Times-Italic">and Equipment — Voltage Ratings (60 Hertz)</span></i><span style="font-size:9.0pt;font-family:Times-Roman">.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>

<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">This is a huge change from the way it was previously written. You can thank me next time I see you with a beer. This was my proposal.</span></p>

<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Bill.</span></p>

<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal">
<b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a> [<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Marco Mangelsdorf<br>

<b>Sent:</b> Thursday, October 17, 2013 9:31 PM<br><b>To:</b> 'RE-wrenches'<br><b>Subject:</b> [RE-wrenches] smaller 3-phase commercial inverters</span></p></div></div><p class="MsoNormal"> </p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in">

<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Yeah, lots more choices out there in the 10+ to 30 kW range….but pretty much all of the larger capacity models only come at 480V.</span></p>

<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Anyone know why?  We have way more 120/208V applications here in Hawaii than 277/480.</span></p>

<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">marco</span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""></span></p>

</div></div><p class="MsoNormal"> </p><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">Chris Mason wrote:</span></p></div><div><p class="MsoNormal">
<span style="font-size:10.0pt;font-family:"Verdana","sans-serif""> </span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">>SMA just came out with their Sunny Tripower line for the US. </span></p>

</div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif""> </span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">Yes those are interesting. But they are only for 480 Wye, not 240 Delta.....</span></p>

</div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">Is the Fronius 11.4-3 the only 3-phase inverter that can work with 240 3-phase with a hi-leg (stinger)?</span></p>

</div></div></div></div></div>
</blockquote></div><br></div>