Canon/Unisolar branch of 'Honesty... [RE-wrenches]

[Carl Emerson]

Bill,

Thanks again for your considered reply.

I would really like Richard Perez to do a reading on the US64 on the Home Power
Democracy rack.

If it is near rating then the problem might well be one of quality control.

Tests differ greatly it seems, NERL test report STR97USR.002 shows a stable
output from installation.

In an NERL paper by Kroposki and Hansen the authors commented that the "long
term data exhibit degradation trends equal to or better than crystalline."

I think now that it is quite significant that Canon are giving a 20 year
performance warranty on the product from Japan but only a 10 year warranty on
the Unisolar product with no performance guarantees.

The solar power stations in Australia are using Canon rather than Unisolar
product.

I like everyone else would like to get to the bottom of this.

Carl Emerson.

Bill Brooks wrote:

> 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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