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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><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>
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<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: 415.641.4000</span></p><p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#1f497d">m: 415.559.1525</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">re-wrenches-bounces@lists.re-wrenches.org</a> [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">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><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">re-wrenches-bounces@lists.re-wrenches.org</a> [<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">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";color:black">Chris Mason wrote:</span></p></div><div><p class="MsoNormal">
<span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black"> </span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">>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";color:black"> </span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:black">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";color:black">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>
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