DBK [RE-wrenches]

[Joel Davidson]

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For a NASA animation of average total-sky incoming solar flux in watts/m2 
see http://svs.gsfc.nasa.gov/vis/a000000/a003000/a003095/index.html

For ASTM reference solar spectral irradiance at Air Mass 1.5 see 
http://rredc.nrel.gov/solar/spectra/am1.5/

For the office of the California Attorny General see http://www.ag.ca.gov/

----- Original Message ----- 
From: "Peter Parrish" <peter.parrish at calsolareng.com>
To: <RE-wrenches at topica.com>
Sent: Sunday, June 11, 2006 2:37 PM
Subject: RE: DBK [RE-wrenches]


>
> Let's be careful here.
>
> I am a physicist and I have to tell you that light exhibits both a
> corpuscular nature (the photon) and a wave nature. This is one of the
> fundamental consequences of quantum mechanics.
>
> Having said that, the radiation from the Sun that reaches the earth's
> surface can be characterized as a "spectrum" (roughly speaking a curve of
> flux over wavelength).
>
> I am not sure what the total flux (watts per square meter) is over all
> wavelengths, but the sun's spectrum peaks in the visible (and less
> consequently in the ultraviolet and less in the infrared.
>
> Single crystal or polycrystalline silicon solar cells have their peak
> efficiency in the infrared at 1.1 microns, so much of the sun's spectrum 
> is
> not utilized. Multiple junction solar cells are tuned to work at different
> wavelengths to address this problem.
>
> What we are talking about here is factors of five or ten (20% efficiency 
> or
> 10% efficiency) not factors of 100.
>
> As far as electrons are concerned, the ones that can produce net (i.e.
> useful external) current are created by photons that get into the
> semiconductor junction. That is, they are "born in the junction". Whether 
> or
> not, once born, they make it to the external terminals of the solar sell 
> and
> become useful current, it another matter and part of the efficiency
> equation.
>
> I hope this helps to clarify some of the issues.
>
> - Peter Parrish
>
> -----Original Message-----
> From: Marco Mangelsdorf [mailto:marco at pvthawaii.com]
> Sent: Saturday, June 10, 2006 10:18 AM
> To: RE-wrenches at topica.com
> Subject: DBK [RE-wrenches]
>
>
>
> Check this out from the DBK website:
>
>
>
> ABOUT THE JIL-3000
>
> The current pictures reflect the prototype version of the new model
> JIL-3000. In the manufactured version all cells will be recessed and the
> surface will be smooth.
>
> Question: How do you get so much power from a solar panel?
>
> Answer: We have overcome three major obstacles of typical solar panel on
> the market: 1) photons which have too short a wavelength bounce off and 
> are
> not absorbed; 2) those with too long a wavelength go thru the panel and 
> end
> up as heat; 3) and lastly electrons that sit on the skin and fail to go 
> thru
> the junction.
>
>
>
> Now, I'm not a physicist, but I didn't know that photons possessed
> wavelength.Has the nature of light changed that much since I was in 
> college?
>
>
>
>
>
> Marco Mangelsdorf
>
> ProVision Technologies, Inc.
>
> Electrical Contractor C-26351
>
> 69 Railroad Avenue, A-7
>
> Hilo, Hawai'i 96720
>
> (808) 969-3281
>
> (808) 934-7462 fax
>
> <http://www.provisiontechnologies.com> www.provisiontechnologies.com
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
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