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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'>Mac:<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'>I approached this problem some years ago and posted about it on this forum. What I heard is that, yes, it can be done. The actual process is known by a few former Trace engineers and could not be divulged due to confidentiality agreements signed when Outback split off from Xantrex (or Trace, if that is what it was called at the time). If you know a former Trace Engineer, you might be able to wrest the information out of them if the stature of limitations has expired.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'>Of course I was not satisfied with “this information is only is for some to know,” so I worked on the problem. My idea is to connect two inverters in series and then feed them into the AC1 inputs of two more inverters in parallel. Since the SW inverters can provide true “Gen Support” mode, the downstream inverters can assist the upstream inverters, therefore providing the gross power of all four inverters. See this <a href="http://www.millersolar.com/MillerSolar/case_studies/case_studies.html">page</a> for a drawing. </span><span style='font-family:"Arial","sans-serif"'> Look about halfway down the page for Cascading SW inverters.<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Now I have come up with some pretty strange ideas in my time, but I think this is one of the more wacky, but actually possible solutions. I never had the chance to test this scheme, but I would love to know if it would actually work.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>William<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>PS: Just as I was finishing this email I remembered the situation I was trying to correct. The other idea is here: <span style='color:black'><a href="http://www.millersolar.com/MillerSolar/case_studies/pv_school/pv_school_wiring_digrams.html">Link</a> I don’t recommend this technique for the reasons stated on the web site, but there may the germ of an idea that may work. It would have to do with feeding a transformer from opposite ends with paralleled inverters. How to keep them in sync…<o:p></o:p></span></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'>Good Luck,<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'>William Miller<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p><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"'> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Mac Lewis<br><b>Sent:</b> Wednesday, October 02, 2013 8:01 AM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> [RE-wrenches] parallel stacking SW<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Hi wrenches,<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I have some folks that I'm meeting in a couple of days that have 4 Trace SW 5048 inverters. It's a very large, older compound-style installation that the original installer has bailed on. They have it set up so that there is a common battery bank and each pair of series stacked inverters are independently feeding 2 separate 120/240 busses. One of these 120/240 services gets utilized very heavily, and one isn't really used at all. Is it possible with this type of inverter, to have all four inverters feeding a common AC bus, two feed Phase A and the other two feeding phase B?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I know that is possible to series stack and to parallel stack this inverter, but can you do both at the same time?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>If so, does anyone have a pin out to a parallel stacking cable?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Thanks in advance<o:p></o:p></p></div><div><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal>-- <o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'>Mac Lewis<b><span style='font-family:"Arial","sans-serif";color:#FF9900'><o:p></o:p></span></b></p><p><span style='color:#305A78'>"Yo solo sé que no sé nada." </span><b><span style='color:#686868'>-Sócrates</span></b><b><span style='font-family:"Arial","sans-serif";color:#FF9900'><o:p></o:p></span></b></p></div></div><div class=MsoNormal align=center style='text-align:center'><hr size=1 width="100%" noshade style='color:#A0A0A0' align=center></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>No virus found in this message.<br>Checked by AVG - <a href="http://www.avg.com">www.avg.com</a><br>Version: 2014.0.4142 / Virus Database: 3604/6704 - Release Date: 09/27/13<o:p></o:p></p></div></body></html>