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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=blue><div class=WordSection1><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial","sans-serif";color:blue'>Allan:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial","sans-serif";color:blue'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial","sans-serif";color:blue'>I would not provide a means to disconnect a neutral. In 120/240VAC split phase power systems it is rarely appropriate to disconnect the neutral.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial","sans-serif";color:blue'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial","sans-serif";color:blue'>I would instead have the generator feed a small subpanel. In that subpanel I would have a 2 pole breaker feed the shop tool. I would have another 2 pole breaker feed the X-240. You need to make certain the direct hot feed to the inverter is derived inside of the X-240.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial","sans-serif";color:blue'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial","sans-serif";color:blue'>I have been at odds with many of the wiring recommendations presented by Outback. The diagram you included is drawn poorly, leaving out some important exterior details, making it easy to wire incorrectly. The diagram below (from the July, 2008 manual) is depicted better, but as published, the wiring is still incorrect. I have modified the drawing to indicate how it should be wired. The problem with the original wiring is that when you open the breaker, it unloads only one phase of the generator.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial","sans-serif";color:blue'><img width=500 height=323 id="Picture_x0020_1" src="cid:image004.png@01CEABCA.A23EC810"></span><span style='font-size:14.0pt;font-family:"Arial","sans-serif";color:blue'><o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial","sans-serif";color:blue'>One additional enhancement you could provide is you could easily interlock the breakers in the gen-fed panel so only one breaker can be on at a time. This is easily done with off-the-shelf interlocks from Square D or GE, or it is easy to build an interlock from some scrap aluminum angle and a bandsaw. We build many interlocks in the shop. Sure, they are not “listed,” but they are a simple mechanical device that one can hold in one’s hand, manipulate and verify intuitively that they work.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial","sans-serif";color:blue'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial","sans-serif";color:blue'>William</span><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:blue'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:blue'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:blue'>PS: </span><span style='font-size:14.0pt;font-family:"Arial","sans-serif";color:blue'>I also disagree with Outback in using black for one phase and red for the other. In an Outback AC cabinet it is less important, in my view, to keep track of which phase is which. Much more important is to keep track of input versus output wiring. I use black for “hot sometimes” and red for “hot all of the time.” This is not to minimize the importance to wire correctly according to your stack plan. The plan I suggested is just easier for me. I am interested in any comments on this idea.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial","sans-serif";color:blue'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial","sans-serif";color:blue'>Wm</span><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:blue'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:blue'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:blue'>Miller Solar<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:blue'>V/C 805-438-5600<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:blue'>Note above number is for all voice calls.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:blue'>Lic 773985<o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Arial","sans-serif";color:blue'><o:p> </o:p></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";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Allan Sindelar<br><b>Sent:</b> Saturday, September 07, 2013 11:56 AM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> [RE-wrenches] PSX-240 wiring question<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>Wrenches,<br>Here's a small issue on which I need help. It concerns the best functional way to wire up an Outback PSX-240 balancing autotransformer for a specific purpose.<br><br>I have somehow succeeded in transferring the wiring diagram on page 6 of Outback's PSX-240 installation manual into this message. This is for a step-down/generator balancing function. <br><br>The situation: 8kW 240V AC generator serving an older system with a single Trace SW4024. The 240V from the generator enters the PSX240 as wired according to the diagram. The primary role of the generator is to provide occasional backup charging to the batteries through the inverter. The specific issue is that the client also wants 240V AC from the generator to be available to a single shop receptacle to run a stationary woodworking tool. The generator is not large enough to both run the tool and charge at full (33A @120V AC / 120A @24V DC) AC2 amps in setting, and we don't want to reduce the charge rate, as it's currently ideal for the new HUP industrial flooded batteries.<br><br>We initially tapped 240V off of the generator feed ahead of the 25A two-pole breaker in the PSX-240. We instructed the customer to turn off this 25A breaker when using the power tool (the tool circuit has its own separate two-pole breaker). What we discovered, which is obvious in hindsight, is that one of the generator's 120V AC legs continues to feed the inverter AC2 input with the breaker off. This causes the inverter to try to draw too much current from that AC generator leg only.<br><br>My question: could I solve this by simply moving the "120VAC to Neutral" output feed (now tapped off of L2) shown on the drawing below to the other side of the 25A circuit breaker; that is, to point 4 in the drawing? It seems to me that this would work, and would not intrinsically overload either of the two 25A poles of the breaker. The 120V AC output to the inverter could in theory draw 50A; 25A from L2 and 25A through the windings of the transformer. But this solution seems almost too simple. What am I missing, please?<br><br><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><img width=575 height=648 id="_x0000_i1025" src="cid:image003.jpg@01CEABC8.48258370"><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>-- <br><br><o:p></o:p></p><p class=MsoNormal><b>Allan Sindelar</b><br><br><o:p></o:p></p></div></div></body></html>