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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:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Allan,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In answer to your question: Yes, we’re developing an AC side 4kW diversion mode controller which allows temperature compensated three stage charging for AC coupled inverter applications. It is currently in beta site testing. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Brian Faley<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Chief Engineer<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Magnum Energy Inc.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>2211 West Casino Rd<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Everett, WA 98204<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Ph 425-353-8833<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>www.magnumenergy.com<o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><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> Thursday, March 07, 2013 2:41 PM<br><b>To:</b> RE-wrenches<br><b>Cc:</b> Support<br><b>Subject:</b> Re: [RE-wrenches] AC Coupled Magnum Issue<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0 style='background:#FFF7D9;border-collapse:collapse;border:none'><tr><td width=53 valign=top style='width:40.0pt;border-top:solid #FFCC00 4.5pt;border-left:solid #FFCC00 4.5pt;border-bottom:none;border-right:none;padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><br><br><o:p></o:p></span></p></td><td width=319 valign=top style='width:239.4pt;border-top:solid #FFCC00 4.5pt;border-left:none;border-bottom:none;border-right:solid #FFCC00 4.5pt;padding:0in 5.4pt 0in 5.4pt' id=1d5h1lj><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>McAfee SiteAdvisor Warning<o:p></o:p></span></b></p></td></tr><tr><td width=53 valign=top style='width:40.0pt;border-top:none;border-left:solid #FFCC00 4.5pt;border-bottom:solid #FFF7D9 4.5pt;border-right:none;padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><o:p> </o:p></span></p></td><td width=319 valign=top style='width:239.4pt;border-top:none;border-left:none;border-bottom:solid #FFF7D9 4.5pt;border-right:solid #FFCC00 4.5pt;padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>This e-mail message contains potentially unsafe links to these sites:<o:p></o:p></span></p></td></tr><tr><td width=53 valign=top style='width:40.0pt;border:none;border-left:solid #FFCC00 4.5pt;padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal align=right style='text-align:right'><a href="http://www.siteadvisor.com/sites/athens-electric.com/?pip=false&premium=true&client_uid=446795512&client_ver=3.6.0.187&client_type=IEPlugin&suite=true&aff_id=0&locale=en_us&ui=1&os_ver=6.1.1.0"><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black;text-decoration:none'><img border=0 width=18 height=18 id="Picture_x0020_1" src="cid:image001.gif@01CE1B44.E36F95B0"></span></a><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><o:p></o:p></span></p></td><td width=319 valign=top style='width:239.4pt;border:none;border-right:solid #FFCC00 4.5pt;padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>http://athens-electric.com/<o:p></o:p></span></p></td></tr><tr><td width=53 valign=top style='width:40.0pt;border-top:none;border-left:solid #FFCC00 4.5pt;border-bottom:solid #FFCC00 4.5pt;border-right:none;padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><o:p> </o:p></span></p></td><td width=319 valign=top style='width:239.4pt;border-top:none;border-left:none;border-bottom:solid #FFCC00 4.5pt;border-right:solid #FFCC00 4.5pt;padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><o:p> </o:p></span></p></td></tr></table><p class=MsoNormal style='margin-bottom:12.0pt'>OK, a bit more:<br>The line diagram I was referencing was dated 5/1/2010. A later diagram from a Powerpoint given at last year's NABCEP CE conference shows a "MagNet" AC diversion controller. It allows AC diversion loads and three-stage charging. No mention of temp comp.<br><br>Magnum needs to weigh in on this.<br>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>On 3/7/2013 3:00 PM, Drake wrote:<o:p></o:p></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal>Hello Wrenches,<br><br>I had an unexpected glitch in AC coupling a Magnum 4024 PAE inverter. The system utilizes AGM batteries, which (according to Concorde tech support) have a very strict upper voltage limit.<br><br>The relay used to stop the current input from the direct grid tie inverter, when battery voltage is high, is controlled by a Morningstar Relay Driver. The relay driver is set to shut off the charge at 28.8 volts.<br><br>The charger on the Magnum is set to charge the batteries to 28.6 volts. <br><br>The plan was to be able to charge batteries from the Magnum without tripping the AC connection between the grid tie inverter to the grid. The Magnum should charge to 28.6 volts, 0.2 volts below the relay driver's programmed trigger point. <br><br>There is one catch to using this approach. The Magnum inverter has a remote temperature sensor in the battery bank. The relay driver is not temperature corrected. Therefore, when the batteries are cold, the charging voltage goes up in the Magnum. This higher voltage trips the relay controlled by the driver, and disconnects the grid tie inverter from the grid. <br><br>I've played with the voltage set points, but the charge voltage on the Magnum would be too low for good battery maintenance. If these were liquid electrolyte batteries, I'd crank up the voltage on the relay driver. Since they are AGM batteries, it doesn't seem like a good idea to do that. <br><br>The work around for this at present is to; <o:p></o:p></p><ul type=disc><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>Charge batteries at night in the winter <o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>No problem is expected in the summer <o:p></o:p></li></ul><p class=MsoNormal>The batteries are in an insulated box in a shed connected to the house. The inside of the battery box has a screened hole that is supposed to allow heated air into the box. This vent doesn't keep the batteries warm enough to prevent the problem. <br><br>Is there a temperature sensitive, voltage controlled relay or diver available? Has anyone used a temperature bulb with the relay driver in a way that could solve this problem? Has anyone else come up against this issue, and if so, what was your solution?<br><br>Thanks,<br><br>Drake <br><br><br>Drake Chamberlin<br><i>Athens Electric LLC<br>OH License 44810<br>CO License 3773<br>NABCEP Certified Solar PV Installer<br>740-448-7328<br></i><a href="http://athens-electric.com/">http://athens-electric.com/</a> <br><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>Change email address & 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></blockquote><p class=MsoNormal><o:p> </o:p></p></div></body></html>