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<p>I would have figured that everyone in the PV industry would know
about anti-seize compound by now. SS to SS or SS to Al is prone to
seizing even when not over-tightened. Dis-similar metals
everywhere can be vulnerable to seizing. <br>
</p>
<pre class="moz-signature" cols="72"><font size="+1">Jim Duncan, retired
North Texas Renewable Energy Inc
817.917.0527
<a class="moz-txt-link-abbreviated" href="mailto:solarguy2004@gmail.com">solarguy2004@gmail.com</a></font></pre>
<p><a class="moz-txt-link-freetext" href="https://www.grainger.com/product/2VFF3">https://www.grainger.com/product/2VFF3</a></p>
<p>*****************************************<br>
</p>
<pre class="moz-signature" cols="72">
</pre>
<div class="moz-cite-prefix">On 9/7/2021 11:36 AM, Jerry Shafer
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAMUFgmUBA5P5JTcwKUAbi7CJyOEPG43jMpxrTYtLfXn=cZr2Wg@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Wrenches
<div>Per request from Unirac I cut sections off and sent it back
to unirac and they say that modules that did not come loose we
over tightened, they do something like magaflux on iron, they
could see fractures in the rails, aluminum cracks when bent
where steel is bending. </div>
<div>Jerry </div>
<div><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Sep 7, 2021 at 4:30 AM
Will White <<a href="mailto:will@solarenergy.org"
moz-do-not-send="true">will@solarenergy.org</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">Jerry,
<div><br>
</div>
<div>I'm curious, how did they prove over torquing? When
doing inspections it's easy to find connectors that are
under torqued but I haven't heard of a reliable way to
check for over torque.</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Will</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Sep 6, 2021 at
1:34 AM Jerry Shafer <<a
href="mailto:jerrysgarage01@gmail.com" target="_blank"
moz-do-not-send="true">jerrysgarage01@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div dir="auto">1/4" x 20 is no more the 10 ftlbs (120
inlbs) and a good 1/4" impact should be able to get you
over 30 ftlb. When you overtorq bolts and nuts you put
undue and irreversible stretching and or tearing of the
material not to mention warping or bending of the
plates, and rails, loosening and retorqing is a wait as
if damage is done its done, the best solution is to
replace all the stressed hardware. I have seen unirac
"T" bolts crack the the rails with a bad result, so the
question is how far do you want to dig and risk to take.
Regarding cracked glass, I have only seen this with
incorrect use of the clamps but over torqing will also
crush the frames. I have inspected arrays after high
wind events that resulted in destruction of the array
and the manufacture in all cases used over torq as thier
out so warranty are only as good as the installers.
<div dir="auto">Jerry</div>
<div dir="auto">NABCEP PV inspector</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Sep 5, 2021,
8:56 PM Corey Shalanski <<a
href="mailto:coresolar@gmail.com" target="_blank"
moz-do-not-send="true">coresolar@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px
0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div dir="ltr">
<div>August,</div>
<div><br>
</div>
<div>Thanks for your feedback.The racking model is <a
href="https://ecolibriumsolar.com/ecofoot2plus/"
rel="noreferrer" target="_blank"
moz-do-not-send="true">EcoFoot2+</a> by
Ecolibrium Solar (now part of Unirac). These
module clamps are also self-grounding with teeth
to bite into the module frame. I reached out to
the manufacturer, who confirmed that the clamp
material is aluminum extrusion and the hardware is
stainless steel.</div>
<div><br>
</div>
<div>The modules were installed about 2 weeks ago,
so not very much time has elapsed to be able to
observe potential resultant damage. We haven't
seen any problems so far.</div>
<div><br>
</div>
<div>--</div>
<div>Corey</div>
<div><br>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Sep 3,
2021 at 6:35 AM August Goers <<a
href="mailto:august@luminalt.com"
rel="noreferrer" target="_blank"
moz-do-not-send="true">august@luminalt.com</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px
0px 0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex"><br>
<div dir="auto">Hi Corey -</div>
<div dir="auto"><br>
</div>
<div dir="auto">For many years we used Pro Solar
racking and Unirac Solarmount and tightened
the clamps with impact drivers. At some point
maybe roughly 8 years ago, Unirac switched its
mid clamps to stainless steel self grounding
clamps with teeth to bite into the module
frame. We continued to use impacts with no
issue. Then, starting around 4 years ago, we
started to have module glass failures with our
SunPower commercial systems and these Unirac
clamps. We immediately switched to torque
wrenches for tightening the clamps. However,
the failures continued. My guess is that the
poor design of the Unirac mid clamps in
conjunction with thinner \u201cweaker\u201d module
frames exasperated the issue. We now have
stopped using those mid clamps and continue to
hand tighten all clamps. We primarily install
SunPower, and their residential module frames
have a lip so all the pressure from the clamp
doesn\u2019t go to the glass. </div>
<div dir="auto"><br>
</div>
<div dir="auto">Getting to your question - what
kind of mid clamps do you have? If they are
aluminum, there may be less risk than the
stainless clamps. I would be worried that the
process of loosening and then re-tightening
might cause more damage than good if there
aren\u2019t any problems that have occurred to
date. It\u2019s a good question.</div>
<div dir="auto"><br>
</div>
<div dir="auto">August</div>
<div dir="auto">Luminalt</div>
</blockquote>
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