homework [RE-wrenches]

[max balchowsky]

The reason for the tilt is simple, those paying for my design time have asked that the panels be tilted..... The tilt will, in fact increase the production value of the system (although I don't think the increased production value is worth the extra cost of mounting hardware and labor, but, I just work here. The important question for me is where in Autocad 3D did you find the info of the deg of tilt of the vector? I'm using Autocad 2007, but I think a lot of the switches are in the same place as the earlier versions....
   
  Max

William Miller <wrmiller at charter.net> wrote:
  
Max:

I guess you miss my point: Why tilt the panels up and incur aesthetic, 
structural and geometric headaches when there is so little to gain by doing 
so in a grid-tie system?

Or, maybe I miss your point: Try this logic: If the roof slopes to 296 T 
and your rows are flat on the roof, the azimuth of your modules is 296. If 
the row is tilted up to vertical (even if it is running down the pitch) 
your orientation is 206. The azimuth sweeps between the two orientations 
depending on the tilt. My 3d cad shows the azimuth of the panels as 81 deg 
west of south (261). This is the orientation of the modules when viewed 
from overhead, ignoring tilt.

Or, you are not explaining your question in a manner that I understand....

William Miller

At 10:46 PM 4/12/2008, you wrote:


>The azmuth shifts because the panels are on a roof that is tilted 22.6 
>degrees to the west (296 degrees).
> The panels are also tilted 15 degrees to the s/w (202 degrees) on the 
> roof that is tilted at 22.6 deg to the west (296 DEG)
>
> max
>
>William Miller wrote:
>
>Max:
>
>Isn't the azimuth you are looking for, uh, 206 degrees?
>
>Instead, consider this idea: I ran the CSI EPBB calculator for Beverly
>Hills using 20 Solar World SW175m modules flat on the roof you described,
>with an inverter to match. The calculator indicated the flat-against-the
>roof system would provide 93% of the production of a south facing array. I
>would avoid trying to tilt modules up and instead add approximately 7% more
>modules and lay them flat.
>
>In my own humble opinion, tilting modules up in saw tooth fashion is
>old-school.
>
>William Miller
>
>PS: You could run this model also in the PV Watts web based calculator. I
>think you will find that the result is a bit more pessimistic, but still,
>add even a few more modules and again, lay them flat on the roof.
>
>WM
>
>At 09:41 AM 4/11/2008, you wrote:
>
>
>
>
> > I need help with my homework. I've got a project in Beverly Hills
> > that is going to be sitting on a roof facing 296 deg at a 22.6 deg pitch.
> > On this roof we will set rows of modules in landscape to the south at 15
> > deg tilt and a bearing of 206 deg. I do all my drawings in cad, but I
> > don't use the 3D component much. I thru it in cad and came up with the
> > coordinates for the vector coming off the plane of the panel. However, I
> > can't figure out how to find the angle that the vector is pointing in
> > reference to the compass.
> >
> > Madd Max (been chewing on this for 2 days now)
>
>
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