Unisolar Roofing [RE-wrenches]

[Doug Pratt]

"Todd Cory, Bald Mtn. Solar" wrote:

> I believe Real Goods did a real time comparison with the US64's and they
> did real well.
>
> Doug, you got the data on that?

As a matter of fact I do Todd.  But as Carl Emerson noted in his post, I was
more or less asked to clam up about it.  The gist of the story is that the
US64's, even after 6 months of light soaking on Sandia's racks, delivered
equivalent to 85-watt modules, and kicked butt on the Astropower AP75's, and
the Siemens SP75's they were being tested against. There were four examples
of each module, randomly choosen from Real Goods stock to eliminate any
lucky draws or "hot samples". Unfortunately, Real Goods was selling lots and
lots of Astropower and Siemens modules at that time, and not so much
Uni-Solar. So it really wasn't to our advantage to publicize the test, and
there were some fairly powerful industry representatives who were fairly hot
about it.
  The data from Sandia indicated that the US64's came out of the boxes
delivering almost 100 watts. Can you say attenuation?! In 6 months they'd
come down to about 85 watts. I think Uni-Solar is betting they'll still make
52 watts at 20 years, but nobody knows for sure till then.

Doug Pratt
Real Goods Technical Editor


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