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<p>Drake,</p>
<p> I am no expert, BUT, about a year ago I covered an
older not-in-service PV with a foot of snow on a 25 degree day and
then hooked up a hose to a hot water faucet. With a pistol grip
sprayer I directed a solid stream of hot water at the PV. It only
took a second for that hot water to reach the PV's glass, no doubt
cold from the snow. I kept it there in one area for about 30
seconds, slowly widening the area of 'impact', much of the snow
melting of course.</p>
<p> Afterwards I carefully visually inspected the PV (it
was an older Kyo) and could not find/see anything out of the
ordinary, still tested to label specs (slight de-rating due to
age) when placed in direct sun.</p>
<p> Another note, several times I have sprayed cool tap
water (around 45 degrees, F) on my in-service array on my shop to
eliminate the snow. It's a 12:12 pitch but it still took a good
15 minutes to clear it off. The array is 22, 60 cell PVs. I have
not any decrease in performance to date.</p>
<p> Conclusion? None really, I can't imagine 'washing'
snowy PVs off with cool water could do any harm. Whereas the hot
water test, intuitively probably not smart.</p>
<p>Bill<br>
</p>
<pre class="moz-signature" cols="72">Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
530.284.7849
CA Lic 874049
<a class="moz-txt-link-abbreviated" href="http://www.frenergy.net">www.frenergy.net</a></pre>
<div class="moz-cite-prefix">On 2/1/2017 11:13 AM, Drake wrote:<br>
</div>
<blockquote cite="mid:20170201191338.84F051009D@che.dreamhost.com"
type="cite">
Hi Wrenches,<br>
<br>
We have a lot of border line temperatures here that will not quit
melt
the snow off an array. We can lose production on a semi sunny, 28
degree
day. During such a day, I was looking at my frost free water
faucet and
my array. Humm, I could easily hose the snow off.<br>
<br>
Is there a reason not to do that? Any ice or slush would not
present a
problem. Is there a danger to the modules from doing that? <br>
<br>
Maybe this would even work on a sunny day when the temperatures
were
colder? Could a module break? Anyone ever try this?<br>
<br>
Thanks,<br>
<br>
Drake <br>
<br>
<a moz-do-not-send="true" name="_MailAutoSig"></a>Drake Chamberlin<br>
<i>Athens Electric LLC<br>
OH License 44810<br>
CO License 3773<br>
NABCEP Certified Solar PV <br>
740-448-7328<br>
</i><a moz-do-not-send="true" href="http://athens-electric.com/">http://athens-electric.com/<br>
<br>
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