Tracker efficiencies, etc. [RE-wrenches]

[John Mottl]

Our experience has been that there is a noticeable difference between etched
single crystal modules and poly crystal modules which can not be etched.
This shows up as the sun moves 20 degrees past optimal. We have checked
Kyocera Siemens and Solarex crystals.
If you are choosing to stay with a fixed rack... there is a noticeable
improvement when using an etched single crystal module over a polycrystal.
Other issues come into play that are equally significant, such as how
manufacturers chose to rate their modules and claimed VS actual outputs. We
looked at effects on actual module output.

John Mottl
Rainshadow Inc.

----- Original Message -----
From: "Carl Emerson" <freepower at freepower.co.nz>
To: <RE-wrenches at topica.com>
Sent: Monday, March 25, 2002 6:10 PM
Subject: Re: Tracker efficiencies, etc. [RE-wrenches]


> Hi Chris,
>
> Back in '97 I had a fixed democracy rack going with SP75 US64 MSX77 BP275.
>
> I was most interested in Daily Amp Hours delivered and logged this over a
> six month period. I have privately distributed the results.
>
> I am kicking myself for not logging the outputs at different times of the
> day but I do remember that as the sun came to the North at 12.30 pm in NZ
> the glass panels that were previously lagging behind the amorphous caught
up
> and produced a larger proportion of their daily yield when approaching
face
> on to the sun.
>
> This is firm in my mind that Mono Poly and Amorphous has different
responses
> to incident angles of direct sunlight.
>
> This can easily be verified if someone has the time to do it.
>
> I have often said that for this reason the rating of panels face on to a
> controlled light source is a non-sense.
>
> It is how much power is delivered when the sun is at acute angles to the
> panel that matters....  Unless you have a twin axis tracker !!
>
> Cheers
>
> Carl Emerson.
>
> Chris Worcester wrote:
>
> > Hi Carl,
> >
> > I (& others) would be very interested in the modules you're referring to
> > (Siemens, BP, etc. or Crystalline, Amorphous) in this racking scenario.
> > Thanks
> >
> > Carl Emerson wrote:
> >
> > I have found significant variation in performance loss between the main
> > panel technologies when the angle is not optimized...
> >
> > Chris Worcester
>
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