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I think modules have uneven heating whenever snow is melting off, with
some of the module covered with frozen snow and adjacent portions of the
module exposed to direct sunlight. <br><br>
At 03:53 PM 1/3/2013, you wrote:<br>
<blockquote type=cite class=cite cite="">
<font face="Times New Roman, Times">With heat tape I'd be worried about
uneven heating of the module surface and possible cracking.<br><br>
I have toyed with the idea of running a length of 2" or 3"
conduit under the bottom of the modules on my shop roof. It would be
capped on the end and have 3/8" holes drilled in it every foot. It
would lead inside the building to a simple blower on a timer. The heat
would be even and gentle.<br><br>
I've noticed that if I can just clean off the bottom foot or so of the
array the heat gets up under the snow the whole mass comes down on the
first sunny day. An hour of warm air might jump start the
process.<br><br>
Hilton<br>
</font><br>
<pre>--
Hilton Dier III
Renewable Energy Design
Partner, Solar Gain LLC
453 East Hill Rd.
Middlesex, VT 05602
</pre><font face="Courier New, Courier"></font>
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