About a year or two ago there was a world shortage of lead and scrap prices
for lead wet up and up, but these days I have not heard any more about this.
We are getting ready to clean out all the old L-16's we have taken back during
system up-grades that have been piling up, but the local
Lead prices are way down from a year ago, futures are up - if you want to
hold them for a year to get another 2 cents a pound :). Right now recycling
is barely break even if not for the mandatory core charge.
http://www.metalprices.com/FreeSite/metals/pb/pb.asp
Wrenches,
We have been asked for a cost estimate for a grid-tied PV system sized
to offset the electrical consumption of a building that is still in the
design phase. The building in question will be a elementary/high school
for a small community in southern Colorado. The only information
At this point in the process you are prudent to minimize your effort while
showing a desire to give the client some ballpark numbers. As long as they
don't want you to dial in a large swimming pool pumping system or a
machine/auto shop, start with 2 Wp/sqft, 40 kW and decide what you want to
Luke,
I will give you 2 answers and they are both right, depending on circumstances.
1. In the back of my now out of print book, I had a simple fill-in-the-blank
form to size solar pv systems. The first number you enter is how much money the
client was willing to spend, then it works backwards
Wrenches,
Someone posted a website or calculation for determining the spacing between
solar arrays, but I can not find it. It is easy to get the spacing from a
drawing when the array faces true south, but when the array faces southeast or
southwest is what we need to know. Please help. Thank
Joel:
We have a spreadsheet on our web site that calculates inter-row spacing for
south facing rows on flat or angled
surfaces: http://millersolar.com/resources/resources.html
You have added a new twist that has us momentarily stumped -- non-south
facing rows. I am working on a solution
Ken,
Thank you. This website and software gives the sun altitude and azimuth. I seem
to recall 3D graphic dynamic software where you input the site longitude and
latitude, solar panel tilt angle and the north side height and the result would
be a shade pattern shown for each hour. Does anyone
Joel:
Do you mind if I send you a 97 mb animation?
William
At 06:28 PM 5/11/2009, you wrote:
Ken,
Thank you. This website and software gives the sun altitude and azimuth. I
seem to recall 3D graphic dynamic software where you input the site
longitude and latitude, solar panel tilt angle
Hello William,
Thanks for the offer, but I'm limited to 15 MB.
Your spreadsheet is nice and simple (if I'm using it correctly).
160-inch panel length
flat roof
10 degrees panel tilt
sun 30 degrees altitude
sun 180 degrees azimuth
= 205.6 inches inner-row space (approx 1 to 1.3 ratio).
FYI -
Jeff and Peter,
Thanks for your input. It's helpful.
Cheers,
-Luke
Luke Christy
NABCEP™ Certified PV Installer
Solar Gain Services, LLC
45943 County Rd E
Center, CO. 81125
sgsrenewab...@gmail.com
719.588.3044
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Sketchup from Google does shadows, and allows setting time of day and day of
year. Challenge is getting latitude adjusted. The Pro version allows
inputting, whereas the free version requires some tricks.
Message: 3
Date: Mon, 11 May 2009 18:28:29 -0700
From: Joel Davidson
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