<div dir="ltr">This assumes 180º is optimum, which it may be for you, but 170º is actually closer to modeled optimum in my area. Bill Brooks nailed it by clarifying that it's all about the kWh/m^2/day, or more accurately kWh/m^2/year for netmetered customers without TOU metering. My research at the link below covers 36 azimuth at five popular roof pitches in my area (180 data points). This is the analysis you need to do if you want really good answers fro your customers, which is what Will has done below on a smaller scale.<div><br></div><div><a href="http://floridasolardesigngroup.com/solar-electricity-output-based-on-tilt-and-orientation/">http://floridasolardesigngroup.com/solar-electricity-output-based-on-tilt-and-orientation/</a><br><div><br></div><div>If you are familiar with APIs, you can get the data from PVWATTS programmatically without too much difficulty.</div><div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>Jason Szumlanski</div><div><br></div><div><br></div></div></div></div></div></div></div></div></div><div class="gmail_quote">On Tue, Jul 28, 2015 at 2:23 PM, Will White <span dir="ltr"><<a href="mailto:William.White@rgsenergy.com" target="_blank">William.White@rgsenergy.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-US" link="blue" vlink="purple">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I did a quick simulation using PV Watts for a small system in Western Mass. Here’s what I found:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Azimuth Roof Pitch kWH/year % of optimum<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">180 40 2593 100%<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">0 40 1291 49%<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">0 10 1996 79%
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">75 40 1829 70%<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Looks like roof pitch makes a pretty big difference in our area.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thanks,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Will<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#999999">Will White</span></b><br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#999999">Director of Construction – East Coast
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#999999">RGS Energy</span><u></u><u></u></p>
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<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:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>]
<b>On Behalf Of </b>Chris Mason<br>
<b>Sent:</b> Tuesday, July 28, 2015 1:50 PM</span></p><div><div class="h5"><br>
<b>To:</b> RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>><br>
<b>Subject:</b> Re: [RE-wrenches] Using the North Facing Roof<u></u><u></u></div></div><p></p><div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal">In the Caribbean, low tilt roofs that face North can work very well, we (16 degrees) are below the Tropic of Cancer (23 degrees) and the sun is in the North for much of the year.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal">On Tue, Jul 28, 2015 at 12:24 PM, <<a href="mailto:billbrooks7@sbcglobal.net" target="_blank">billbrooks7@sbcglobal.net</a>> wrote:<u></u><u></u></p>
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<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Jarmo,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></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%.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></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….</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Bill.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></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:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>]
<b>On Behalf Of </b><a href="mailto:Jarmo.Venalainen@schneider-electric.com" target="_blank">Jarmo.Venalainen@schneider-electric.com</a><br>
<b>Sent:</b> Tuesday, July 28, 2015 8:04 AM<br>
<b>To:</b> RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>><br>
<b>Subject:</b> Re: [RE-wrenches] Using the North Facing Roof</span><u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></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 border="0" width="610" height="434" src="cid:image001.gif@01D0C941.007047C0"><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> <a href="tel:%2B604-422-2528" target="_blank">+604-422-2528</a> | <b>
Tech Support:</b> <a href="tel:800-670-0707" target="_blank">800-670-0707</a> |
<b>Mobile:</b> <a href="tel:%2B604-505-0291" target="_blank">+604-505-0291</a> <b>
<br>
Email:</b> </span><a href="mailto:jarmo.venalainen@schneider-electric.com" target="_blank"><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><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5f5f5f">From:</span>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif">"Peter Parrish" <<a href="mailto:peter.parrish@calsolareng.com" target="_blank">peter.parrish@calsolareng.com</a>></span>
<u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5f5f5f">To:</span>
<u></u><u></u></p>
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<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" target="_blank">re-wrenches@lists.re-wrenches.org</a>>,
</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5f5f5f">Date:</span>
<u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif">07/28/2015 12:22 AM</span>
<u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5f5f5f">Subject:</span>
<u></u><u></u></p>
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<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>
<u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5f5f5f">Sent by:</span>
<u></u><u></u></p>
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<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" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>></span><u></u><u></u></p>
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<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"><a href="tel:%28323%29%20839-6108" target="_blank">(323) 839-6108</a></span>
<br>
<span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#004080"><a href="mailto:petertor@pobox.com" target="_blank">petertor@pobox.com</a></span>
<br>
<span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#004080"> </span>
<u></u><u></u></p>
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<p class="MsoNormal">Chris Mason<u></u><u></u></p>
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<p class="MsoNormal">Skype: netconcepts<u></u><u></u></p>
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