<div dir="ltr">Could you add the ability to use coordinates instead of zip code, otherwise it is no use outside the US.</div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jul 30, 2015 at 1:16 PM, Jason Szumlanski <span dir="ltr"><<a href="mailto:jason@floridasolardesigngroup.com" target="_blank">jason@floridasolardesigngroup.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I figured while I'm at it I might as well release something else that you can actually print out and present to your clients or use for your own visualization purposes. This is a very similar tool that will output a web page with a radar chart (like a spider web representing the compass) and a data table down to the secondary intercardinal directions. Hover over the points to see the value.<div><div><br></div><div><a href="http://floridasolardesigngroup.com/pva/do-site-analysis.php" target="_blank">http://floridasolardesigngroup.com/pva/do-site-analysis.php</a><br></div><div><br></div><div>Run it at two different tilt angles and check out the differences. Eventually I plan to update this to compare two (or more) tilt angles on the same radar chart. For now, this is all you get. :)</div><div><br></div><div><br></div><div><img src="cid:ii_14edff35bdc79cae" alt="Inline image 3" width="411" height="562"><br></div><div><br></div><div><br></div><div><br></div><div>Once again, enjoy!</div><span class="HOEnZb"><font color="#888888"><div><br></div><div>Jason</div></font></span><div><div class="h5"><div class="gmail_extra"><br clear="all"><div><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><span><br></span></div></div></div></div></div></div></div></div>
<br><div class="gmail_quote">On Wed, Jul 29, 2015 at 10:56 AM, Jason Szumlanski <span dir="ltr"><<a href="mailto:jason@floridasolardesigngroup.com" target="_blank">jason@floridasolardesigngroup.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I want to give back to this forum that has been so valuable to me, so here it is... a tool for you to quickly compile data for multiple compass orientations for a given pitch...<div><br></div><div><a href="http://floridasolardesigngroup.com/pva/do-pvwatts-wrenches.php" target="_blank">http://floridasolardesigngroup.com/pva/do-pvwatts-wrenches.php</a><br><div><br></div><div>This PVWATTS derived tool will give you 36 data points for solar energy production with every azimuth from 0º to 350º at 10º increments for a given location and pitch. You can enter your desired system size to model its output and include your desired PVWATTS derate (system loss) factor. It will download a .CSV file each time you run the tool. You can run it for a variety of tilt angles based on your needs to compile data for your own study.</div><div><br></div><div>There are limits on use, but if everyone does not run out and use it at the same time it should be fine.</div><div><br></div><div>Once you get your data into a spreadsheet you can easily slice and dice it any way you want and make some great visualizations.</div><div><br></div><div><img src="cid:ii_14eda3731dbd10fa" alt="Inline image 1" width="562" height="448"><br></div><div><br></div><div><br></div><div>Enjoy!</div><span><font color="#888888"><div><br></div><div>Jason Szumlanski</div></font></span><div><div><div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jul 28, 2015 at 7:01 PM, Allan Sindelar <span dir="ltr"><<a href="mailto:allan@sindelarsolar.com" target="_blank">allan@sindelarsolar.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="background-color:rgb(255,255,255);color:rgb(0,0,0)" bgcolor="#FFFFFF" text="#000000">
I am paying close attention to this thread, but for different
reasons. I have designed and will install next month an off grid
system for a high-elevation research hut. At 14,242' I believe this
will be the highest elevation
off grid system in the continental US (Alaska too?), at the
Summit Hut atop White Mountain, east of the Sierra crest in eastern
California (<a href="http://wmrc.edu/facilities/bar/summit.html" target="_blank">wmrc.edu/facilities/bar/summit.html</a>). For me it's sort
of a post-retirement summer working adventure. A nearly identical
system will
serve an older observatory at 12,700' in the same area. The Summit
Hut will get a roof array where winds of 190 mph have been measured,
I'm told. The roof has about a 5º north-facing tilt. <br>
<br>
I'm old-school too, thinking in terms of a 25º tilt to south. But
other than powering an internet repeater all year, the system is
only used during the summer months, mid-June to mid-October, when
the snow has melted and it's accessible by a long jeep trail. So in
that respect it's similar to a flat- or north-facing array in a
grid-tied system, where only summer gain matters much and a southern
tilt matters less that I want to believe. Jason's chart is pretty
useful here, suggesting that I should pay more attention to handling
wind loads with a low angle than maximizing summer gain.<br>
Allan<br>
<br>
<div>
<div>
<p class="MsoNormal"><b>Allan Sindelar</b><br>
<span style="font-size:10.0pt"><a href="mailto:allan@sindelarsolar.com" target="_blank"></a><a href="mailto:allan@sindelarsolar.com" target="_blank">allan@sindelarsolar.com</a></span><br>
<span style="font-size:10.0pt">NABCEP Certified PV
Installation Professional<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder (Retired), <span>Positive
Energy,
Inc.</span><br>
<b><a href="tel:505%20780-2738" value="+15057802738" target="_blank">505 780-2738</a> cell</b><br>
<br>
<b><u></u><u></u></b></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
</div><span>
<div>On 7/28/2015 11:15 AM,
<a href="mailto:billbrooks7@sbcglobal.net" target="_blank">billbrooks7@sbcglobal.net</a> wrote:<br>
</div>
</span><blockquote type="cite">
<div><span>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Larry
and Peter,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">You
are too old-school to think outside the box. It’s not about
direct sunlight—it’s all about kWh/m^2/day and those numbers
don’t lie. Your analysis is not correct and this is why
simple analyses will always give you a wrong answer. <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">North-facing
arrays have been financially attractive for years, but many
have not done it due to taboos or bad analysis. Reverse-tilt
arrays often look horrible and should be avoided
particularly on the street-side of a house. Also, the
structural impacts of tilted arrays on residential rooftops
are not well-understood so wind-loading calculations are
complex at best.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">We
have been using east and west facing roofs for your years so
what’s the big deal about north? I put together the one of
the first tables of orientation version performance way back
in 2001 for the California Energy Commission to combat the
misconceptions that PV arrays had to be mounted at
45-degrees facing South (the prevailing misconception at the
time). I didn’t print the North facing numbers because the
concept would have blown people’s minds at the time—they
weren’t ready for the truth.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">30-degrees
facing south is optimal in most latitudes from 20-degrees to
50-degrees. (perfect in most locations)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">4:12
pitch (18-degrees) facing south is 97% of perfect.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">4:12
pitch east or west is 88% of perfect.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Flat
is 89% of perfect.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">4:12
pitch facing north is 75% of perfect.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">The
truth shall set you FREE.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Bill.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
</span><div>
<div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in">
<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
[<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On
Behalf Of </b>Starlight Solar Power Systems<span><br>
<b>Sent:</b> Tuesday, July 28, 2015 9:41 AM<br>
</span><b>To:</b> RE-wrenches
<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank"><re-wrenches@lists.re-wrenches.org></a><span><br>
<b>Subject:</b> Re: [RE-wrenches] Using the North Facing
Roof<u></u><u></u></span></span></p>
</div>
</div><span>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal">In Yuma, AZ, north facing modules will
have direct sunlight for small part of the year. In the
picture, look at the yellow area above the East-West line.
Thats direct sunlight from the north. The green top line in
the picture shows summer solstice showing sunlight from
sunrise to about 0930 and from 1530 to sunset. The energy
harvested during those hours will be tiny compared to the
peak sun hours on the south side. The angle of incidence
will also reduce the total power generated during those
hours.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">The thin brown middle line is the
equinox. By then, there is no direct sunlight on the north
side. I can not see any benefit in AZ even at todays low
prices. Now, if I were building in Quetzaltenango,
Guatemala, that would be a different story. But then again,
I would have to clean off the volcanic ash each morning. <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<div>
<p class="MsoNormal">Larry Crutcher<br>
Starlight Solar Power Systems<u></u><u></u></p>
</div>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<p class="MsoNormal"><img src="cid:part2.04040500.07020701@sindelarsolar.com" height="379" width="381"><u></u><u></u></p>
</span><div><span>
<p class="MsoNormal">chart came from <a href="http://www.gaisma.com/en/" target="_blank">http://www.gaisma.com/en/</a><u></u><u></u></p>
<div>
<div>
<div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-family:"Helvetica",sans-serif;color:black"><br>
<br>
<u></u><u></u></span></p>
</div>
</div>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
</span><div><span>
<div>
<p class="MsoNormal">On Jul 27, 2015, at 11:21 PM, Peter
Parrish <<a href="mailto:peter.parrish@calsolareng.com" target="_blank">peter.parrish@calsolareng.com</a>>
wrote:<u></u><u></u></p>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
</span><div>
<div><span>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">I
recently read a short piece that caught me up
short, and I quote:<br>
<br>
<br>
</span><u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">“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><u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">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><u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p>
</div>
<p><span style="font-family:"Calibri",sans-serif"><span>-<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Peter
</span><u></u><u></u></p>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p>
</div>
</span><div><span>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Peter
T. Parrish, Ph.D.</span><u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">President,
SolarGnosis</span><u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">1107
Fair Oaks Ave., Suite 351</span><u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">South
Pasadena, CA 91030</span><u></u><u></u></p>
</div>
</span><div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">(323)
839-6108</span><u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><a href="mailto:petertor@pobox.com" target="_blank"></a><a href="mailto:petertor@pobox.com" target="_blank">petertor@pobox.com</a></span><u></u><u></u></p>
</div>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p>
</div>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt">_______________________________________________<br>
<br>
<u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"><u></u> </p></div></div></blockquote></div></blockquote></div></div></div></div></div></div></div>
</blockquote></div><br></div></div></div></div></div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr">Chris Mason<div><div style="color:rgb(136,136,136)"><span style="font-size:13px">NABCEP Certified Solar PV Installer™</span></div><div style="color:rgb(136,136,136)"><span style="color:rgb(34,34,34)">Solar Design Engineer</span></div><div style="color:rgb(136,136,136)"><span style="font-size:13px">Generac Generators Industrial technician</span></div></div><div style="color:rgb(136,136,136)"><span style="font-size:13px"><br></span></div><div><a href="http://www.cometenergysystems.com" target="_blank">www.cometsolar.com</a></div><div>264.235.5670</div><div>869.662.5670</div><div>Skype: netconcepts</div></div></div>
</div>