<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
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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'>I have experience with the SI/SB designs, and can warn you that they typically need a boatload of additional switchgear to support a good robust design. That being said they work great together, handle battery charging like no other and we rarely get calls on them.<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'>I have seen the XW system, and although have no firsthand experience with it, was walked through one by another trusted wrench, and his experience with both systems may have swayed me – almost all the wall of additional switchgear has been incorporated into the XW…<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'>My next GTWB system will be an XW system.<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'>YMMV,<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'>Glenn<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><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, August 23, 2012 10:39 AM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> [RE-wrenches] Sunny Island vs. XW system - advice requested<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Wrenches,<br>We have worked with Outback Radian and Schneider XW once or twice each for grid-tie with backup, and with Sunny Boy/Sunny Island numerous times. The SMA is certainly the most sophisticated equipment, but also the most expensive. <br><br>For a particular job coming up, the loads are not excessive, and the array will be 8kW. The main hitch is that the array will be located on a barn roof that is about 500' from the BOS and home.<br><br>I suspect that running high-voltage DC from the array to a Sunny Boy, and then feeding a pair of Sunny Islands makes the most sense. My question is this: does it make any sense to consider running two high-voltage subarrays 500' to two Schneider XW-MPPT-80 600V charge controllers, feeding two XW inverters (in order to handle the full 8kW) in a DC-coupled approach? <br><br>Is there ever a situation in which this would be a better solution than SMA?<br><br>Thank you, as always,<br>Allan<o:p></o:p></p><div><p class=MsoNormal>-- <br><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></div></body></html>