power tolerance point of fact [RE-wrenches]

[Warren Lauzon]

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That could well be. The Unisolar 64's did the same thing. We have seen as 
much as 75 watts from them when new, but after a year in the Arizona sun 
they were pretty close to what the specs said.


----- Original Message ----- 
From: "Bill Brooks" <bill at brooksolar.com>
To: <RE-wrenches at topica.com>
Sent: Thursday, April 07, 2005 9:12 AM
Subject: RE: power tolerance point of fact [RE-wrenches]


David,

My understanding of their a-Si coating of the cell is that it is not used in
the same way an a-Si module works and therefore is not necessarily exposed
to the same Staebler-Wronski effect that all a-Si modules are exposed to.
The primary driver is the mono-crystalline cell and the a-Si coating
improves the conduction of the electrons to the conductors on the surface of
the cell. Degradation mechanisms are not well understood or documented for
this process. However, Sanyo feels that moisture ingression is a much bigger
issue for this module so that put an aluminum backsheet on the backside of
the cells (after the EVA) to reduce moisture flow below that of standard
Tedlar.

Bill.

-----Original Message-----
From: David Brearley [mailto:DavidB at energyoutfitters.com]
Sent: Thursday, April 07, 2005 8:41 AM
To: RE-wrenches at topica.com
Subject: RE: power tolerance point of fact [RE-wrenches]

When I was in school in New Mexico, we took Daystar readings in the winter
that exceeded 1100 W/m2.  We were probably at 5500 feet.  Marco's point is
well taken, without a meter reading who's to say if 204 watts off a 190 watt
module is higher or lower than expected?

Perhaps someone on the list can offer insight into the Sanyo's amorphous
silicon layer performance out of the box?  I have always understood that
amorphous silicon modules come out of the box outperforming their ratings.
After an accelerated period of Light Induced Degradation, the module output
stabilizes, presumably at a power level warranted by the manufacturer.

If the amorphous layer in the Sanyo behaves the same way, then it stands to
reason that the modules will come out of the box "hot", performing above
rated power.

Any thoughts?

David C. Brearley
Eastern Regional Branch Manager
NABCEP Certified Solar PV Installer(tm)

Energy Outfitters
218 Little Falls Rd, Units 7 & 8
Cedar Grove, NJ 07009
Phone: 973/239-1815
Fax: 973/239-8794
www.energyoutfitters.com

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