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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-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Jarmo,<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'>The sun’s geometry is not nearly that simple. To understand the impact of north-facing arrays, you have to perform a simulation. PV:WATTS does this just fine and it is easy to show that a 18-degreed North-facing tilt produces 75% of a perfect 30-degree south-facing array. Far more than your assumption of 50%.<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'>To compare 15-degrees South to 15-degrees North, the numbers are slightly better at 77%. We are going to see a lot of north-facing arrays once people understand that low tilt angles are very forgiving on North slopes. Steep slopes are a totally different story and you have to run the numbers….<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'>Bill.<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><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> RE-wrenches [mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Jarmo.Venalainen@schneider-electric.com<br><b>Sent:</b> Tuesday, July 28, 2015 8:04 AM<br><b>To:</b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br><b>Subject:</b> Re: [RE-wrenches] Using the North Facing Roof<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>I did a slide on the effect of North facing modules. For even a fairly aggressive rotation North as shown, the effect is "only" a 50% reduction.</span> <br><br><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>The questions of whether or not to do it, are,</span> <br><br><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>- is the mounting structure simpler, lower cost</span> <br><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>- security against wind</span> <br><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>- can I put a larger array on the roof (typically yes, if you make back to back pyramid shaped structures)</span> <br><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>- overall, what is the cost versus benefit</span> <br><img width=610 height=434 id="_x0000_i1025" src="cid:image001.gif@01D0C916.96962470"><br><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>JARMO<br></span><span style='color:green'>_____________________________________________________________________________________</span> <br><b><span style='font-size:7.5pt;font-family:"Arial",sans-serif'><br>Jarmo Venalainen</span></b><span style='font-size:7.5pt;font-family:"Arial",sans-serif'> | <b><span style='color:green'> Schneider Electric </span> | Xantrex Brand</b> | <b>CANADA</b> | <b>Sales Application Engineer</b> <b><br>Phone:</b> +604-422-2528 | <b>Tech Support:</b> 800-670-0707 | <b>Mobile:</b> +604-505-0291 <b><br>Email:</b> </span><a href="mailto:jarmo.venalainen@schneider-electric.com"><span style='font-size:7.5pt;font-family:"Arial",sans-serif'>jarmo.venalainen@schneider-electric.com</span></a><span style='font-size:7.5pt;font-family:"Arial",sans-serif'> | <b>Site:</b></span><a href="http://www.xantrex.com/" target="_blank"><span style='font-size:7.5pt;font-family:"Arial",sans-serif'> www.Xantrex.com</span></a><span style='font-size:7.5pt;font-family:"Arial",sans-serif'> | <b>Address:</b> 3700 Gilmore Way, Burnaby, BC V5G4M1 </span><o:p></o:p></p><table class=MsoNormalTable border=0 cellpadding=0><tr><td colspan=4 style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><a href="http://www.xantrexrebate.com/" target="_blank"><span style='text-decoration:none'><img border=0 width=1 height=1 id="_x0000_i1026" src="cid:image003.png@01D0C916.96962470"></span></a><o:p></o:p></p></td></tr><tr><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><a href="http://www.xantrex.com/" target="_blank"><span style='text-decoration:none'><img border=0 width=166 height=55 id="_x0000_i1027" src="cid:image004.gif@01D0C916.96962470"></span></a><o:p></o:p></p></td><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><a href="https://www.facebook.com/Xantrex" target="_blank"><span style='text-decoration:none'><img border=0 width=36 height=55 id="_x0000_i1028" src="cid:image005.gif@01D0C916.96962470"></span></a><o:p></o:p></p></td><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><a href="https://twitter.com/Xantrex" target="_blank"><span style='text-decoration:none'><img border=0 width=38 height=55 id="_x0000_i1029" src="cid:image006.gif@01D0C916.96962470"></span></a><o:p></o:p></p></td><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><a href="https://twitter.com/Xantrex" target="_blank"><span style='text-decoration:none'><img border=0 width=303 height=55 id="_x0000_i1030" src="cid:image007.gif@01D0C916.96962470"></span></a><o:p></o:p></p></td></tr></table><p class=MsoNormal style='margin-bottom:12.0pt'><br><br><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:#00A000'><br>*** Please consider the environment before printing this e-mail</span><br><br><br><o:p></o:p></p><table class=MsoNormalTable border=0 cellpadding=0 width="100%" style='width:100.0%'><tr><td valign=top style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F'>From:</span> <o:p></o:p></p></td><td valign=top style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial",sans-serif'>"Peter Parrish" <<a href="mailto:peter.parrish@calsolareng.com">peter.parrish@calsolareng.com</a>></span> <o:p></o:p></p></td></tr><tr><td valign=top style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F'>To:</span> <o:p></o:p></p></td><td valign=top style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial",sans-serif'>"'RE-wrenches'" <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>>, </span><o:p></o:p></p></td></tr><tr><td valign=top style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F'>Date:</span> <o:p></o:p></p></td><td valign=top style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial",sans-serif'>07/28/2015 12:22 AM</span> <o:p></o:p></p></td></tr><tr><td valign=top style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F'>Subject:</span> <o:p></o:p></p></td><td valign=top style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial",sans-serif'>[RE-wrenches] Using the North Facing Roof</span> <o:p></o:p></p></td></tr><tr><td valign=top style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F'>Sent by:</span> <o:p></o:p></p></td><td valign=top style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial",sans-serif'>"RE-wrenches" <<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>></span><o:p></o:p></p></td></tr></table><p class=MsoNormal><o:p> </o:p></p><div class=MsoNormal align=center style='text-align:center'><hr size=2 width="100%" noshade style='color:#A0A0A0' align=center></div><p class=MsoNormal><br><br><br><span style='font-size:10.0pt;font-family:"Calibri",sans-serif;color:#004080'>I recently read a short piece that caught me up short, and I quote:<br></span><br><span style='font-size:10.0pt;font-family:"Calibri",sans-serif;color:#004080'>“The fast dropping cost of solar, while a huge boon to the adoption of solar PV, has counter-intuitively altered design parameters. No longer is the north-facing roof considered unusable because limited application in less-than optimal orientations can still show a positive net benefit. Arrays are thus designed now with elements or sub-arrays in these locations, increasing overall kW installation while reducing the energy production per capacity installed. This might have been anticipated based on sheer economic analysis from a users perspective, but so long has solar been expensive that these less optimal orientations were never seriously considered.”</span> <br><span style='font-size:10.0pt;font-family:"Calibri",sans-serif;color:#004080'> </span> <br><span style='font-size:10.0pt;font-family:"Calibri",sans-serif;color:#004080'>I doubt that the individual who wrote this piece came to these conclusions him/herself. Does anyone know of a recent article that argued this perspective? Is this an emerging design practice? If so, I’d like to know more about it. </span><br><span style='font-size:10.0pt;font-family:"Calibri",sans-serif;color:#004080'> </span> <br><span style='font-size:10.0pt;font-family:"Calibri",sans-serif;color:#004080'>- Peter </span><br><span style='font-size:10.0pt;font-family:"Calibri",sans-serif;color:#004080'> </span> <br><span style='font-size:10.0pt;font-family:"Calibri",sans-serif;color:#004080'>Peter T. Parrish, Ph.D.</span> <br><span style='font-size:10.0pt;font-family:"Calibri",sans-serif;color:#004080'>President, SolarGnosis</span> <br><span style='font-size:10.0pt;font-family:"Calibri",sans-serif;color:#004080'>1107 Fair Oaks Ave., Suite 351</span> <br><span style='font-size:10.0pt;font-family:"Calibri",sans-serif;color:#004080'>South Pasadena, CA 91030</span> <br><span style='font-size:10.0pt;font-family:"Calibri",sans-serif;color:#004080'>(323) 839-6108</span> <br><span style='font-size:10.0pt;font-family:"Calibri",sans-serif;color:#004080'><a href="mailto:petertor@pobox.com">petertor@pobox.com</a></span> <br><span style='font-size:10.0pt;font-family:"Calibri",sans-serif;color:#004080'> </span> <o:p></o:p></p><p style='margin-bottom:12.0pt'><br>______________________________________________________________________<br>This email has been scanned by the Symantec Email Security.cloud service.<br>______________________________________________________________________<tt><span style='font-size:10.0pt'>_______________________________________________</span></tt><span style='font-size:10.0pt;font-family:"Courier New"'><br><tt>List sponsored by Redwood Alliance</tt><br><br><tt>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a></tt><br><br><tt>Change listserver email address & settings:</tt><br></span><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org"><tt><span style='font-size:10.0pt'>http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</span></tt></a><span style='font-size:10.0pt;font-family:"Courier New"'><br><br><tt>List-Archive: </tt></span><a href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html"><tt><span style='font-size:10.0pt'>http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html</span></tt></a><span style='font-size:10.0pt;font-family:"Courier New"'><br><br><tt>List rules & etiquette:</tt><br></span><a href="www.re-wrenches.org/etiquette.htm"><tt><span style='font-size:10.0pt'>www.re-wrenches.org/etiquette.htm</span></tt></a><span style='font-size:10.0pt;font-family:"Courier New"'><br><br><tt>Check out or update participant bios:</tt><br></span><a href="www.members.re-wrenches.org"><tt><span style='font-size:10.0pt'>www.members.re-wrenches.org</span></tt></a><o:p></o:p></p></div>
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