[RE-wrenches] used panel mount questions

[Exeltech]

I've seen rack "edge clamps" for frameless PV advertised, but didn't make a
mental note of made by whom, or where I saw the ad.  I *do* recall the clamps
were intended to be located along the long edges, not the ends.  Otherwise,
expansion/contraction would stress/break the glass.

There's a wealth of knowledge and know-how here.  Someone with the answer
will chime in.


Dan

--- On Thu, 5/30/13, toddcory at finestplanet.com <toddcory at finestplanet.com> wrote:

From: toddcory at finestplanet.com <toddcory at finestplanet.com>
Subject: Re: [RE-wrenches] used panel mount questions
To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
Date: Thursday, May 30, 2013, 6:06 PM

good point dan... i wonder how frameless modules are intended to be mounted?
 
todd
 
 
 
 
On Thursday, May 30, 2013 4:00pm, "Exeltech" <exeltech at yahoo.com> said:






I agree with Allen, and would like to add a related comment.  Foam boards are
thermally insulative in nature.  If affixed to the PV with adhesive, they would
cause the PV module to run hotter than if the backsheet was fully exposed
to the air.

This results in reduced energy output under all conditions, and increased
thermal stresses on the PV cells, internal buss, bonds, and other aspects
of the PV.


Dan


--- On Thu, 5/30/13, Allan Sindelar <allan at positiveenergysolar.com> wrote:


From: Allan Sindelar <allan at positiveenergysolar.com>
Subject: Re: [RE-wrenches] used panel mount questions
To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
Date: Thursday, May 30, 2013,  5:46 PM





Todd,
 I don't have your answers, only the caution that "blue foam" to       many of us with a construction background means extruded       polystyrene or "blueboard", commonly used around foundations. It       deteriorates with exposure to sunlight, so could only be used in       an application such as this if protected from UV.
 Allan


Allan Sindelar
Allan at positiveenergysolar.com
NABCEP Certified Photovoltaic             Installer
 NABCEP Certified Technical Sales Professional
 New Mexico EE98J Journeyman Electrician
 Founder and Chief Technology Officer
Positive Energy, Inc.
 3209 Richards Lane (note new address)
 Santa Fe, New Mexico 87507
505 424-1112
www.positiveenergysolar.com
 



On 5/30/2013 4:14 PM, Todd Cory wrote:
wrenches,

 i have a customer who purchased 20 used astropower ap75           modules. they are frameless and appear to have been previously           mounted using four, 2" wide X 10" long strips of blue rigid           foam, glued to the back of each module with some kind of           adhesive.

 two questions:

 this seems to be a reasonable mounting system id like to           repeat. would anyone familiar with this kind of mounting           technique be willing to comment/speculate on an adhesive that           would not degrade the tedlar backsheet? whatever was           previously used worked great.

 what kind of flat/smooth mounting surface would folks suggest           the other side of the blue foam be attached to? the only thing           i can think of is plywood, but that would rot over time.

 thanks,

 todd


 
 

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