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Solar Panel Tilt Angle

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Posted by Jack Hayes on May 27, 2004, 12:30 am
I know this question has been beat to death, but searching Google and
alternate energy sites has produced a LOT of conflicting information. Even
the installation manual that came with my Shell SQ75's seems to be
confusing. My location is 47 deg. N and I would like to produce maximum
energy in the summer months, in winter all I want to do is keep my batteries
at full charge to avoid freezing them. Right now I am considering a 45 deg.
tilt angle, I hope someone here will provide a clear description of how to
calculate the optimum angle.

Thanks in advance  Jack

Posted by Solar Guppy on May 27, 2004, 2:08 am

put in your zip code , select png for output graphic and it will make a very
nice sun chart for your location

Using the sun chart I you just created , pick the sun angle that has the
smallest the difference between your mounting and the sun angle for the time
of interest. This will get you the most power for that period.

If you really want maximum power in the Summer , according to the chart I
just looked at for 47 degrees , it would be at about 30 degrees , and in the
winter the panels would be about 35 degrees off from perpendicular ... you
will still get plenty of juice for battery for float charging ....


Posted by DJ on May 27, 2004, 5:20 pm
Or put in your Lat and Long if you aren't living in the United States ;-).

 That is so cool.


Posted by Klaus Ossmer on May 27, 2004, 5:48 pm

Yes, online is cool. But you can get better results with "sundi" by volker
quasschning because the sun is swinging around the
theoretical point.
Download http://www.volker-quaschning.de/software/index_e.html  . If one has
solar radiation data from near his destination he can
simulate every kind of system mounting. It's inclusive direct and diffuse

Best regards


Sun to the roof (Latin: tecto sol)

http://www.tectosol.staticip.de/    Solarstromerträge im Internet


Posted by Falcon Eddy on May 27, 2004, 7:26 pm
Right, Osama.

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