homework [RE-wrenches]

[Steve Johnson]

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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