[RE-wrenches] panel back tedlar flaking off

[jay peltz]

Hi Joel,

Thanks for the confirmation.

Easier to give bad news to folks when you've got support.

jay

peltz power
On Apr 18, 2009, at 8:52 PM, Joel Davidson wrote:

> The tedlar backsheet is laminated with heat and vacuum to protect  
> the back ethylene vinyl acetate encapsulant. The eva is hydroscopic  
> and moisture will eventually get in to attack the cell  
> interconnects, bus bars, cell grids, and solder. It's only a matter  
> of time before the module dies. You could try carefully painting the  
> back of the laminate with a flexible waterproof paint, but make sure  
> the eva is clean and very dry so you do not capture any contaminants  
> or moisture under the waterproofing.
>
> --- On Sat, 4/18/09, jay peltz <jay at asis.com> wrote:
> From: jay peltz <jay at asis.com>
> Subject: [RE-wrenches] panel back tedlar flaking off
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Date: Saturday, April 18, 2009, 4:14 PM
>
> I"ve got a customer with some panels that the white back laminate is
> literally flaking off in sheets.
>
> they are still working, but what sort of time life do they have?
> And how important is the white part vs the encapsulate behind which  
> seems in
> good shape.
> They are old, at least 15 years, I think they are Photowatt 75 watt,  
> the labels
> are so faded that nothing is readable.
>
> I've just never seen panels literally fall apart like this.
>
> Any thoughts?
>
> thanks,
> jay
>
> peltz power
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