panel comparison [RE-wrenches]

[Joel Davidson]

Jay,

Thanks for the info. You have to go back to Home Power June/July 2001 to find the
last Uni-Solar corporate ad that reads "providing up to 25% more real power over
other solar cell technologies." Uni-Solar does a good job boasting that their
amorphous modules outperform crystalline PV. Parts of a Dutch report
ftp://ftp.ecn.nl/pub/www/library/report/2000/c00067.pdf read like a Uni-Solar
sales brochure. "the United Solar module is exceptional" "Thin-film modules show
high performance ratios and some have excellent low light level characteristics."

However, the difference between a-Si and crystalline is within the plus/minus
uncertainty level according to an article in Sandia's PV program quarterly Volume
3, 2000. Years ago, Keith Emery at the NREL explained that instrument variations
are plus/minus 5%. I say that when irradiance and temperature are factored in, PV
power and energy readings are plus/minus 10% accurate at best.

Customers vote with their pocket books and crystalline PV continues to be command
over 80% of the market.

Joel Davidson



"Jay Peltz, Peltz Power" wrote:

> I just visited the North Coast Co-op where I helped install 2 arrays  1 using
> unisolar 64's and the other with Siemens 130's.  Around 1.2 kw per inverter
>
> Just wanted all to know that the Siemens are outperforming the unisolar by
> around 5%.  And interestly this 5% seems to be consistent on sunny or
> cloudy/foggy days.
>
> System has been installed for a few months now.
>
> Both systems are south facing, same roof ( side of building actually), no
> shading.
>
> Both use SMA 2500U's.
>
> Thanks,
>
> jay
>
> peltz power
>
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