Cleaning PV Arrays [RE-wrenches]

[Bill Brooks]

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Joel and Dean,

I don't think it is the glass-on-glass nature of the BP-850 (Millennia) a-Si
module that causes it to break. It is the fact that they used annealed
glass, and then heat-strengthened glass to make their module. The
heat-strengthened glass reduced the cracking failures, but in either case,
they break in shards, not tiny pieces since they are not tempered.

The reason they are not tempered is because the manufacturing process is so
hot that it would reanneal a tempered sheet of glass so the extra expense of
tempered glass is a waste of money. However, you are left with glass that is
more susceptible to breakage.

Bill.


-----Original Message-----
From: Dean T. Newberry [mailto:deant at dcn.org]
Sent: Monday, September 20, 2004 10:40 PM
To: RE-wrenches at topica.com
Subject: Re: Cleaning PV Arrays [RE-wrenches]

Hi Joel,
I hadn't heard that before.
Kyocera and Isofoton modules break like tempered glass.
I have an Evergreen that broke like regular glass, and Evergreen tech
support says it's tempered. I need to send it back to them for evaluation.

I didn't get a look at the BP Millenium.

cul  deant
Joel Davidson wrote:

>Hello Dean,
>Thanks for the feedback. Glass/glass modules lose some or all of their
>temper when they are put in the laminating oven.
>Joel Davidson
>
>

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