We recently bought some broken modules from a supplier --at a very
good price- to see if we could work something out. After looking into
a variety of options we settled on a lexan sheet cut to size and
secured with polyurethane adhesive along the frame edges. The reason
we chose lexan was due to the fact it is flexible and the broken
modules we purchased actually had a convex shape due to the impact
they received. The polyu worked well on the module with an aluminum
frame but did not like the one with a painted frame so much. The
problem we couldn't solve is the loss of Voc & Isc due to refraction &
reflection from the broken bits of glass. Removing it did not seem
like an option.
Ron Young
On 27-May-10, at 8:11 AM, Joel Davidson wrote:
Jeff,
You can put another glass front on top of the module to protect the
cells and wiring to get a few more years use from the module. My
customer got 3 years of use from a broken module in extreme Alaska
weather. Other customers had similar luck.
1. Clean with low pressure dry air to remove loose glass and dirt.
Be careful with flying glass and avoid damaging cells,
interconnects, and bus wires.
2. Inspect and repair backsheet tears.
3. Test to ensure Voc and Isc are within specifications.
4. Wipe front edge of frame with clean, dry cotton cloth.
5. Apply non-acid silicone RTV on front edge of frame.
6. Apply glass cover module and let silicone seal cure for at least
24 hours.
Good luck.
Joel Davidson
----- Original Message -----
From: Jeff Yago
To: RE-wrenches
Sent: Wednesday, May 26, 2010 8:19 PM
Subject: Re: [RE-wrenches] recover broken modules
Over the past few years we have had our share of modules damaged in
shipment or in handling on our end that were never installed but had
broken glazing. As you know, when these things go they usually look
like a car windshield, with the vinyl backing holding all the broken
small glass pieces together. Seems like a shame to trash, is there
anyone out there with a way to re-glaze a new module with broken
glazing.
Any chance you could just place a new glass glazing over the broken
glass and seal? Or some way to remove the glass pieces without
damaging the module cells and inter-connect foil connections being
held in place by the backing. Seems like a business opportunity,
Jeff Yago
Netscape. Just the Net You Need.
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