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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif";color:windowtext'>If you totally power down do you always need to power up the “master” first or if you reverse the power up will the slave become the master now?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif";color:windowtext'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Century Gothic","sans-serif";color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Century Gothic","sans-serif";color:windowtext'>Dana Orzel - Great Solar Works, Inc - E - <b>dana@solarwork.com</b> - V <b>970.626.5253</b><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Century Gothic","sans-serif";color:windowtext'>F - 970.626.4140 C - 970.209.4076 web - www.solarwork.com <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Century Gothic","sans-serif";color:windowtext'>"Responsible Technologies for Responsible People since 1988"<o:p></o:p></span></p><p class=MsoNormal><b><i><span style='font-size:13.5pt;font-family:"Calibri","sans-serif";color:green'>P </span></i></b><b><i><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";color:green'>Please consider the environment before printing this email</span></i></b><b><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#99CC00'><o:p></o:p></span></i></b></p></div><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif";color:windowtext'><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> Friday, May 25, 2012 7:47 AM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] SW master & slave<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Mac,<br>Unlike the later Outback, for which you designate a master, the SWs had no way to do such designation. I think that when you boot them up (apply DC power), whichever unit receives power first becomes the master, and the other becomes the slave. <br><br>According to the manual, the issue of master/slave generator control applies only to parallel-stacked inverters operating at 120V AC output with a SWI/PAR stacking cable, and not with series stacking (120/240 VAC) configuration. Page 96:<o:p></o:p></p><p class=MsoNormal>When using two units in parallel, it is recommended that only the SLAVE inverter be used to control the<br>generator. This is required because the generator control system includes a cool down timer that causes<br>the controlling inverter to disconnect from the generator before it turns the generator off. If the MASTER<br>controls the generator, then the SLAVE may not stay in sync with the MASTER during the cool-down<br>period since it will remain in sync with the generator and not follow the MASTER. There currently is no<br>adjustment for the cool-down period, so restricting the generator control to the SLAVE is the only solution<br>available at this time.<o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>Allan<o:p></o:p></p><div><p class=MsoNormal><b>Allan Sindelar</b><br><span style='font-size:10.0pt'><a href="mailto:Allan@positiveenergysolar.com"><span style='color:#000099'>Allan@positiveenergysolar.com</span></a></span><br><span style='font-size:10.0pt'>NABCEP Certified Photovoltaic Installer<br>NABCEP Certified Technical Sales Professional<br>New Mexico EE98J Journeyman Electrician<br>Founder and Chief Technology Officer<br><b>Positive Energy, Inc.</b><br>3209 Richards Lane (note new address)<br>Santa Fe, New Mexico 87507<br><b>505 424-1112</b><br><a href="http://www.positiveenergysolar.com/" target="_blank">www.positiveenergysolar.com</a></span> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-right:722.25pt;mso-margin-bottom-alt:auto'><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><br>On 5/25/2012 7:16 AM, mac Lewis wrote: <o:p></o:p></p><p class=MsoNormal>Hello wrenches, <o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I recently series stacked two SW 4024s. Everything seems to work fine. I want to follow the recommendation that the slave device is the generator controlling inverter. How do I tell which is the master and which is the slave?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Thanks<br clear=all><o:p></o:p></p><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><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><br><br><br><o:p></o:p></p><pre>_______________________________________________<o:p></o:p></pre><pre>List sponsored by Home Power magazine<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Options & settings:<o:p></o:p></pre><pre><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>List-Archive: <a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>List rules & etiquette:<o:p></o:p></pre><pre><a href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Check out participant bios:<o:p></o:p></pre><pre><a href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a><o:p></o:p></pre><pre><o:p> </o:p></pre></div></body></html>