<font size=2 face="sans-serif">Hi:</font>
<br>
<br><font size=2 face="sans-serif">Granted that the description is very
simple, but that is the intent. </font>
<br>
<br><font size=2 face="sans-serif">The essence of it is that the "loss"
for small variations in angle of incidence is approximately bounded by,
(less than), the sin of the angle between the orientations of two panels/arrays
in question.</font>
<br>
<br><font size=2 face="sans-serif">10 degrees ---> minus 17%</font>
<br><font size=2 face="sans-serif">20 degrees ---> minus 33%</font>
<br><font size=2 face="sans-serif">30 degrees ---> minus 50%</font>
<br>
<br><font size=2 face="sans-serif">If you go through the detailed math
and take into account atmospheric effects, especially when the sun
is near the horizons, temperature, location, weather, etc., the result
will vary, but will not be worse than the sin of the angle.</font>
<br>
<br><font size=2 face="sans-serif">I'll draw out better picture with more
detail for Vancouver. We're at a fairly high latitude, so overall
array orientation is a more sensitive factor than farther south.</font>
<br>
<br><font size=2 face="sans-serif">JARMO</font>
<br><font size=2 face="sans-serif"><br>
</font><font size=3 color=#008000>_____________________________________________________________________________________</font><font size=3>
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</font><font size=1 face="Arial"><b><br>
Jarmo Venalainen</b> | </font><font size=1 color=#008000 face="Arial"><b>
Schneider Electric </b></font><font size=1 face="Arial"><b> | Xantrex
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Engineer</b> <b><br>
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| <b>Site:</b></font><a href=http://www.xantrex.com/ target=_blank><font size=1 color=blue face="Arial"><u>
www.Xantrex.com</u></font></a><font size=1 face="Arial"> |
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<td><font size=1 color=#5f5f5f face="sans-serif">From:</font>
<td><font size=1 face="sans-serif">Brian Mehalic <brian@solarenergy.org></font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">To:</font>
<td><font size=1 face="sans-serif">RE-wrenches <re-wrenches@lists.re-wrenches.org>,
</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Date:</font>
<td><font size=1 face="sans-serif">07/28/2015 09:48 AM</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Subject:</font>
<td><font size=1 face="sans-serif">Re: [RE-wrenches] Using the North Facing
Roof</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Sent by:</font>
<td><font size=1 face="sans-serif">"RE-wrenches" <re-wrenches-bounces@lists.re-wrenches.org></font></table>
<br>
<hr noshade>
<br>
<br>
<br><font size=3>The analysis of 50% of south facing production is too
simplistic; running some modeling shows that, depending on the latitude,
the difference can be much smaller, approaching 25% less for the north
facing. I think this layout could become more common especially on
low slope commercial roofs, where the north facing module would occupy
space that was already unused due to interrow shading. Of course
the closer to the equator the less difference between production of the
north and south arrays...and you better be careful when stringing them
in series so as not to mix N and S facing..plus filling in all those gaps
between rows could make servicing the array a bit problematic!</font>
<br>
<br><font size=3>Cheers,</font>
<br>
<br>
<br><font size=3>Brian Mehalic <br>
NABCEP Certified Solar PV Installation Professional™ R031508-59</font>
<br>
<br><font size=3>PV Curriculum Developer and Instructor</font>
<br><font size=3>Solar Energy International</font><font size=3 color=blue><u><br>
</u></font><a href=http://www.solarenergy.org/ target=_blank><font size=3 color=blue><u>http://www.solarenergy.org</u></font></a>
<br>
<br><font size=3>On Tue, Jul 28, 2015 at 10:24 AM, <</font><a href=mailto:billbrooks7@sbcglobal.net target=_blank><font size=3 color=blue><u>billbrooks7@sbcglobal.net</u></font></a><font size=3>>
wrote:</font>
<br><font size=2 color=#004080 face="Calibri">Jarmo,</font>
<p><font size=2 color=#004080 face="Calibri"> </font>
<p><font size=2 color=#004080 face="Calibri">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%.</font>
<p><font size=2 color=#004080 face="Calibri"> </font>
<p><font size=2 color=#004080 face="Calibri">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….</font>
<p><font size=2 color=#004080 face="Calibri"> </font>
<p><font size=2 color=#004080 face="Calibri">Bill.</font>
<p><font size=2 color=#004080 face="Calibri"> </font>
<p><font size=2 face="Calibri"><b>From:</b> RE-wrenches [mailto:</font><a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target=_blank><font size=2 color=blue face="Calibri"><u>re-wrenches-bounces@lists.re-wrenches.org</u></font></a><font size=2 face="Calibri">]
<b>On Behalf Of </b></font><a href="mailto:Jarmo.Venalainen@schneider-electric.com" target=_blank><font size=2 color=blue face="Calibri"><u>Jarmo.Venalainen@schneider-electric.com</u></font></a><font size=2 face="Calibri"><b><br>
Sent:</b> Tuesday, July 28, 2015 8:04 AM<b><br>
To:</b> RE-wrenches <</font><a href="mailto:re-wrenches@lists.re-wrenches.org" target=_blank><font size=2 color=blue face="Calibri"><u>re-wrenches@lists.re-wrenches.org</u></font></a><font size=2 face="Calibri">><b><br>
Subject:</b> Re: [RE-wrenches] Using the North Facing Roof</font>
<p><font size=3> </font>
<p><font size=2 face="Arial">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.</font><font size=3> <br>
</font><font size=2 face="Arial"><br>
The questions of whether or not to do it, are,</font><font size=3> <br>
</font><font size=2 face="Arial"><br>
- is the mounting structure simpler, lower cost</font><font size=3> </font><font size=2 face="Arial"><br>
- security against wind</font><font size=3> </font><font size=2 face="Arial"><br>
- can I put a larger array on the roof (typically yes, if you make
back to back pyramid shaped structures)</font><font size=3> </font><font size=2 face="Arial"><br>
- overall, what is the cost versus benefit</font><font size=3> <br>
</font><img src=cid:_1_0C1B17540C1B10C80061517688257E90><font size=2 face="Arial"><br>
JARMO</font><font size=3 color=#008000><br>
_____________________________________________________________________________________</font><font size=3>
</font><font size=1 face="Arial"><b><br>
<br>
Jarmo Venalainen</b> | </font><font size=1 color=#008000 face="Arial"><b>
Schneider Electric </b></font><font size=1 face="Arial"><b> | Xantrex
Brand</b> | <b>CANADA</b> | <b>Sales Application
Engineer</b> <b><br>
Phone:</b> </font><a href="tel:%2B604-422-2528" target=_blank><font size=1 color=blue face="Arial"><u>+604-422-2528</u></font></a><font size=1 face="Arial">
| <b>Tech Support:</b> </font><a href="tel:800-670-0707" target=_blank><font size=1 color=blue face="Arial"><u>800-670-0707</u></font></a><font size=1 face="Arial">
| <b>Mobile:</b> </font><a href="tel:%2B604-505-0291" target=_blank><font size=1 color=blue face="Arial"><u>+604-505-0291</u></font></a><font size=1 face="Arial">
<b><br>
Email:</b> </font><a href="mailto:jarmo.venalainen@schneider-electric.com" target=_blank><font size=1 color=blue face="Arial"><u>jarmo.venalainen@schneider-electric.com</u></font></a><font size=1 face="Arial">
| <b>Site:</b></font><a href=http://www.xantrex.com/ target=_blank><font size=1 color=blue face="Arial"><u>
www.Xantrex.com</u></font></a><font size=1 face="Arial"> |
<b>Address:</b> 3700 Gilmore Way, Burnaby, BC V5G4M1 </font>
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<td width=12%><font size=1 color=#5f5f5f face="Arial">From:</font><font size=3>
</font>
<td width=87%><font size=1 face="Arial">"Peter Parrish" <</font><a href=mailto:peter.parrish@calsolareng.com target=_blank><font size=1 color=blue face="Arial"><u>peter.parrish@calsolareng.com</u></font></a><font size=1 face="Arial">></font><font size=3>
</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="Arial">To:</font><font size=3> </font>
<td><font size=1 face="Arial">"'RE-wrenches'" <</font><a href="mailto:re-wrenches@lists.re-wrenches.org" target=_blank><font size=1 color=blue face="Arial"><u>re-wrenches@lists.re-wrenches.org</u></font></a><font size=1 face="Arial">>,
</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="Arial">Date:</font><font size=3> </font>
<td><font size=1 face="Arial">07/28/2015 12:22 AM</font><font size=3> </font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="Arial">Subject:</font><font size=3>
</font>
<td><font size=1 face="Arial">[RE-wrenches] Using the North Facing Roof</font><font size=3>
</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="Arial">Sent by:</font><font size=3>
</font>
<td><font size=1 face="Arial">"RE-wrenches" <</font><a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target=_blank><font size=1 color=blue face="Arial"><u>re-wrenches-bounces@lists.re-wrenches.org</u></font></a><font size=1 face="Arial">></font></table>
<p><font size=3> </font>
<div align=center>
<hr noshade></div>
<p><font size=3><br>
<br>
</font><font size=2 color=#004080 face="Calibri"><br>
I recently read a short piece that caught me up short, and I quote:</font><font size=3><br>
</font><font size=2 color=#004080 face="Calibri"><br>
“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.”</font><font size=3>
</font><font size=2 color=#004080 face="Calibri"><br>
</font><font size=3> </font><font size=2 color=#004080 face="Calibri"><br>
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. <br>
</font><font size=3> </font><font size=2 color=#004080 face="Calibri"><br>
- Peter <br>
</font><font size=3> </font><font size=2 color=#004080 face="Calibri"><br>
Peter T. Parrish, Ph.D.</font><font size=3> </font><font size=2 color=#004080 face="Calibri"><br>
President, SolarGnosis</font><font size=3> </font><font size=2 color=#004080 face="Calibri"><br>
1107 Fair Oaks Ave., Suite 351</font><font size=3> </font><font size=2 color=#004080 face="Calibri"><br>
South Pasadena, CA 91030</font><font size=3> </font><font size=2 color=blue face="Calibri"><u><br>
</u></font><a href="tel:%28323%29%20839-6108" target=_blank><font size=2 color=blue face="Calibri"><u>(323)
839-6108</u></font></a><font size=3> </font><font size=2 color=blue face="Calibri"><u><br>
</u></font><a href=mailto:petertor@pobox.com target=_blank><font size=2 color=blue face="Calibri"><u>petertor@pobox.com</u></font></a><font size=3>
</font><font size=2 color=#004080 face="Calibri"><br>
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