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<p>Jason,</p>
<p>This is the way thermal shock was explained to me. Thermal shock
creates micro fractures in the glass. PV modules have tough
tempered glass so one thermal shock event, or a few dozen events,
is unlikely to cause a module to fracture; but eventually the
glass gets to the last straw when the micro fractures connect to
each other and the whole pane breaks up. You can't do much about
sun showers but you can certainly avoid spraying the hose on hot
glass.</p>
Kent Osterberg<br>
Blue Mountain Solar <br>
<p><br>
</p>
<div class="moz-cite-prefix">On 10/20/2023 1:47 PM, Jason Szumlanski
via RE-wrenches wrote:<br>
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<div>I don't understand the thermal shock nonsense. It routinely
starts downpouring here when it's blazing hot out (sun
showers) and the rain is way cooler than ground water in
summer. It makes no sense. If hose water from the ground is
going to hurt solar panels, you better not put them where it
rains!
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<div dir="auto">I replied privately to Dana, but for the
benefit of the group, it takes a heavy soiling to make any
appreciable difference. I have done numerous tests at times
of high pollen and found little to no benefit to cleaning
solar panels. Certainly it would not be worth paying someone
to do it. Other climates may have different results. My
suggestion would be to test first. Module level power
electronics can provide incontrovertible proof.</div>
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<div dir="auto">Jason</div>
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<br>
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<div dir="ltr" class="gmail_attr">On Fri, Oct 20, 2023, 4:21
PM Dave Tedeyan via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" moz-do-not-send="true" class="moz-txt-link-freetext">re-wrenches@lists.re-wrenches.org</a>>
wrote:<br>
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<div dir="ltr">Hi Dana,
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<div>See attached from REC. I would imagine these
guidelines would apply to all modules.</div>
<div>Cheers,</div>
<div>Dave</div>
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<br>
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<div dir="ltr" class="gmail_attr">On Fri, Oct 20, 2023
at 3:56 PM Dana Orzel via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank" rel="noreferrer" moz-do-not-send="true" class="moz-txt-link-freetext">re-wrenches@lists.re-wrenches.org</a>>
wrote:<br>
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0px 0.8ex;border-left:1px solid
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<div>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century
Gothic",sans-serif">Hey ally ‘all,</span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century
Gothic",sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century
Gothic",sans-serif">Ok bad solar
installer! 7 years & I have never
cleaned my modules & live on a dirt
road. Yeah rain does a good job with the
dust but there is a film mostly on the
edges.</span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century
Gothic",sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century
Gothic",sans-serif">What does everyone
do for cleaning?</span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century
Gothic",sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century
Gothic",sans-serif">My array is 16’+
tall on a hill side. I have a pressure
washer & was going to pick up a large
sponge type mop & mount it on a painters
extension pole. </span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century
Gothic",sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century
Gothic",sans-serif">Good Biodegradable
cleaning solutions?</span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century
Gothic",sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century
Gothic",sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:"Century
Gothic",sans-serif">_________________________________________________________</span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:"Century
Gothic",sans-serif;color:rgb(56,86,35)">Dana
Orzel </span><span style="font-size:12pt;font-family:"Century
Gothic",sans-serif;color:rgb(56,86,35)">GREAT
SOLAR WORKS! </span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:"Century
Gothic",sans-serif;color:rgb(56,86,35)">C
– 208.721.7003 E – <a href="mailto:dana@solarwork.com" target="_blank" rel="noreferrer" moz-do-not-send="true"><span style="color:rgb(56,86,35);text-decoration:none">dana@solarwork.com</span></a></span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:"Century
Gothic",sans-serif;color:rgb(56,86,35)">W
- www. <a href="http://greatsolarworks.com" target="_blank" rel="noreferrer" moz-do-not-send="true">greatsolarworks.com</a>
<a href="http://www.solarwork.com/" target="_blank" rel="noreferrer" moz-do-not-send="true"><span style="color:rgb(56,86,35);text-decoration:none">www.solarwork.com</span></a></span></p>
<p class="MsoNormal"><i><u><span style="font-size:12pt;font-family:"Century
Gothic",sans-serif;color:rgb(56,86,35)">“Responsible Technologies
for Responsible People since 1988!”</span></u></i></p>
<p class="MsoNormal"> </p>
</div>
</div>
_______________________________________________<br>
<br>
<br>
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