Wrenches,I recently inspected a system I installed in 2010, because the owner
commented that it appeared the frost wasn't melting off of one particular
module as it was from the others. Turns out the module glass is shattered.
There are no obvious (that i can see) impact points, leading to
In my business I see quite a few broken modules each year. As I recall, in
every instance there is a visible point where the impact occurred. Typically a
small radial pattern is around the impact point but then random patterns over
the rest on the module. Look close. Hope this helps.
Larry
If you used rail and the nuts were too tight there is potential for the
glass to break with no real sign due to the glass actually flexing too much.
David Lauzon
Northern Arizona Wind and Sun
Phone-928-526-8017 / 800-383-0195
Fax-928-527-0729
Website-http://www.solar-electric.com
If you don't see any sign of impact, look closely at the area in front
of the junction box. Any discoloration is an indication that it has been
hot in that area. This often is the case with a shorted diode. The heat
will stress the glass and cause it to fracture or make it susceptible to
A few years ago there was a rash of this type module glass breakage caused
by flaws in the glass, that would not show up until a year's worth of
thermal cycling. I saw several of the non-frame glass only modules fail in
California sun. Without a frame they would curl-up into a U shape.
Usually
I would guess that it was the glass and tempering not complete, or done
correctly. I worked at a glass temperaturing facility most of the sheets can
out fine, but every now and then a few would shatter while on the belt. The
temperaturing put to much stress in teh glass.
thanks for the link Dave, very useful.
Nick Vida___
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