Sharp v Sanyo v Shell modules [RE-wrenches]

[Barbra Kerr]

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Bill -

I understand where you are coming from.  And thank you for letting us know
that the product did come off distributor shelves.  That had been bothering
a few of us in California when the inverters were reviewed.

Barbra K. Kerr
President
Kerr Enterprises, Inc
PO Box 1992
Twain Harte, Ca 95383
1-800-886-2258
209-586-9607 Fax
858-337-5097 Cell


-----Original Message-----
From: Bill Brooks [mailto:bill at brooksolar.com] 
Sent: Wednesday, October 12, 2005 10:42 AM
To: RE-wrenches at topica.com
Subject: RE: Sharp v Sanyo v Shell modules [RE-wrenches]

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Barbara,

Your opinion and experience is extremely important and valuable. I was
simply asking for where you were getting such exact numbers. Those numbers
line up with the CEC/STC ratios, but those ratios are simply based upon the
stated temperature coefficients of the module manufacturers. The Sanyo
modules have a lower temperature dependence (about -0.32%/C whereas standard
crystalline is about -0.5%/C).

To answer your question about selection of product for the PIER program, all
of the products were purchased through distributors and not directly from
the manufacturer. It is highly unlikely that preselection occurred on these
products because the modules were purchased at the beginning of the module
shortage when everyone started getting concerned about supply shortages.

Bill.

-----Original Message-----
From: Barbra Kerr [mailto:bkerr at energy-exchange.org] 
Sent: Wednesday, October 12, 2005 10:20 AM
To: RE-wrenches at topica.com
Subject: RE: Sharp v Sanyo v Shell modules [RE-wrenches]

Bill, we were asked for an opinion and I gave mine with some actual
experience as backup.  I rely on your sector for impartial scientific data.
To further address your comments as far as the efficiency goes, yes partly.
Also looking at cell efficency they are at 19%.  It is the power tolerances
that really set them apart.  As a result of the hand slapping, their product
power tolerances are unmatched, which results in better output estimates,
and a higher confidence in output estimating.  We have seen manufacturers
actually expanding their power tolerances to plus/minus 10%. Wheras Sanyo
reduced their power tolerances.

My only inquiry into what is being tested by the pier group is whether or
not the product being tested is provided by the manufacturer or pulled off
the shelf at the distributer/retailer level?  Assumming that product is
provided by the manufacturer, is it the same as what is on the shelf?  

 

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