system output honesty [RE-wrenches]

[Bill Brooks]

Carl,

The SW is definitely more efficient than 65% for most situations. A good
average number in sell back is 85% (a far cry from the 95% value in the
manual for going through a resistor).

By the way--I'm loving all this honesty.

Incidentally, I was reviewing the TISO study several months back on
different module types and the Unisolar product did extremely poorly on that
test. You had my mind wide open on their products, but this test seems to
confirm my previous experience. The figures for the US64 module are
particularly disturbing since this is the technology they are selling today.
One good piece of news for a-Si is that the APS and Solarex modules did
well.

For those that are interested in this study, here is the URL:
http://www.dct.supsi.ch/leee/PV/TISO_tests_results.htm

Enjoy--sometimes truth hurts, but it always hurts less than a lie in the
long run.

Bill.


> -----Original Message-----
> From: Carl Emerson [mailto:freepower at freepower.co.nz]
> Sent: Sunday, September 02, 2001 4:42 PM
> To: RE-wrenches at topica.com
> Subject: Re: system output honesty [RE-wrenches]
>
>
> Hey guys
>
> These figures are getting close to the claimed efficiency of the SW
> series in sell back mode with a battery bank ???
>
> I think someone said 65% for the SW but this may have been for the
> inverter alone rather than the whole system ???
>
> Carl Emerson.
>
> "Don Loweburg, Offline" wrote:
>
> > I agree with Steve and Jerry. Currently there are unrealistic
> > expectations.
> > Its time to be accurate. Remember this is system output. Too often
> > single
> > component effieciencies are used rather than aggregate efficiency. So
> > 62% on
> > a hot day for a roof mount in Fresno may not be unreasonable.70% is
> > what some
> > are stating for the coastal areas in CA,
> >
> > Don Loweburg
>
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