system output honesty [RE-wrenches]

Bill Brooks billbrooks7 at earthlink.net
Tue Sep 4 09:22:17 PDT 2001


Carl,

If the Canon product is really performing well, then there would have to be
more than subtle differences in the products coming out of the two plants. I
hope that the Canon stuff from Japan is better than the US-64 stuff. There
are a lot of people jumping on this wagon.

Bill.


> -----Original Message-----
> From: Carl Emerson [mailto:freepower at freepower.co.nz]
> Sent: Monday, September 03, 2001 7:35 PM
> To: RE-wrenches at topica.com
> Subject: Re: system output honesty [RE-wrenches]
>
>
> Bill...
>
> Thanks for this, much appreciated.
>
> At the end of the day I am more interested in measured
> performance rather than
> loyalty to a product line.
>
> I am very keen to see a further set of results from the Home
> Power democracy
> rack.
> Last I heard from Richard the US64 was performing near it's rating.
>
> There seems to be significant differences in the test results conducted in
> different parts of the world.
>
> There are two power stations in Australia that are using the Canon EF2-64
> Econoflat roofing modules and data available from there confirms
> the product is
> sustaining high performance over several years.
>
> I am beginning to wonder if there are subtle differences between the Canon
> product from Japan and the Unisolar product from Mexico.
>
> You may be aware that Canon have separated from Unisolar. They
> plan to have a
> new generation of panels in 18 months or so.
>
> Bill Brooks wrote:
>
> > 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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> > >
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> > >
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> > >
> > >
> > >
> >
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>
> --
> Regards,
>
>
> Carl Emerson
> Manager
> FREEPOWER LTD.  "Harnessing Natural Energy"
> P.O. Box 10-1207 N.S.M.C. Auckland, NEW ZEALAND.
> Ph. 09 4275206 fax 09 4275208  cell 021-633999  web www.freepower.co.nz
>
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>

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