homework [RE-wrenches]

[max balchowsky]

The ProE program looks interesting, I'll check that out (it's certainly cheaper that autodesk). The Ladwp online PV Watts program won't show that the angles we input are the result of the co-ordinates of the vector, it just wants to know what the angle is that is determining the production levels. The question that was raised is weather or not the inspector for Ladwp would come and see the panels tilting toward 206 deg and not take into consideration that the tilt toward 206 is on a plane of 22.6 deg tilted toward the west at 296 deg (changing the real angle of orientation). I don't even understand what I just said, so I don't expect anybody tofollow this........I think I'll go surfing now......
   
  Max
  
Steve Johnson <stevejohnson at comcast.net> wrote:
  
wow you guys are making me dizzy

When I run it on PV watts the 296 degree bearing at 22.6 tilt shows a 
23% loss over optimum.

The 206 bearing with 15d tilt shows a 4% loss.

It seems like that is a big difference over 25 years. I may not have 
the picture straight.

Which brings up a question. Is there a point where you don't recommend 
an installation because of losses? For me, if you are losing 20% that 
is a considerable amount and I would not recommend it. Is that too 
conservative? Do people frequently put in systems where there will be 
losses of 20% or greater, whether due to shading, orientation, tilt or 
all 3?

Steve

> 
> Max,
> 
> I actually do 3D design in ProEngineer, so I can't help you with 
> Autodesk.
> 
> Of course this can all be set up in MathCad using three dimensional 
> vector
> equations.
> 
> But, I prefer my ProE 3D model that allows me to model the Azimuths and
> Tilts and then I have a handy-dandy analysis tool in ProE that lets me 
> find
> the value of the projected - normal vector.
> 
> Mark Frye
> Berkeley Solar Electric Systems
> 271 Vistamont Dr
> Grass Valley CA 95945
> (530) 401-8024
> www.berkeleysolar.com
> 
> -----Original Message-----
> From: max balchowsky [mailto:max at seesolar.com] 
> Sent: Sunday, April 13, 2008 10:28 AM
> To: RE-wrenches at topica.com
> Subject: Re: homework [RE-wrenches]
> 
> 
> 
> 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
> 



Steve Johnson
LightWave Solar Electric
Nashville, Tennessee


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