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<p>We did a setup with the Snap N Rack rack on a roof once. We just
used the recommended galvanized SCH 40. Its basically a readily
available product. I would be careful with other types of steel
tubing: make sure it will fit the fittings. We actually
retrofitted a Snap N Rack to some existing pipe ground mount
racking, and it turned out to be a slightly different diameter.
Big pain. 2nd, make sure its galvanized, which can also slightly
change the fit. 3rd, if the snow load is 100 lb/ sq ft, your
total array loading might be over 30,000 lbs. Is saving a few
pounds on the steel really worth considering? Seems like your
post bases on the roof are going to take quite a bit of
engineering to support the snow load. <br>
</p>
<p>Also, final note, the Snap N Rack setup doesn't do very good with
uplift wind loading. It just attaches with pinch bolts, so we had
our one roof rack get sucked off the roof in a hurricane. We
drilled holes and through bolted on the replacement array, but I'm
sure we violated the Snap N Rack 10 commandments by doing that. <br>
</p>
<p>I would consider other racks that might get the tilt with
separate rows, and be overall lower to the roof? Possibly a
ballasted system? <br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 7/26/21 7:15 PM, Dana Orzel wrote:<br>
</div>
<blockquote type="cite"
cite="mid:006f01d78274$124ad3f0$36e07bd0$@solarwork.com">
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">Hey all!<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">I am proposing a [20] module, 35\u02da
tilt up array mounted on a flat roof in snow country -
Central Idaho. Its in town, trees behind & off to the
side a ways. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">The SnapnRack design calls for [21]
Pieces of 1 ˝\u201d x 21\u2019 sched 40 pipe +/-. I am trying to
understand the need for sched 40 pipe on the vertical
components of this array. Though if the horizontal members
could be switched over to tube too that would be a big
savings on weight. I hope to eliminate the sched 40 for
steel tube [stronger metal thinner wall]. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">Without reinventing the wheel, has
anyone approached this issue & how did you address it?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">Suggestions on beefy array systems
that are lighter?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">Spec.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">[20] \u2013 Q-cell 340 watt modules. 5
columns of 4 modules.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">Snow-Load - 100 PSF.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">Tilt - 35\u02da \u2013 The back & sides
will be shrouded up to module on vertical members to prevent
wind uplift.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">Wind - 90 MPH/3 sec microburst
[though IF, this ever happened there would be trees &
garbage cans flying.]<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">Sched 40 -1 ˝\u201d pipe is 2.72#/ft.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">1 7/8\u201d steel tube is 1.25#/ft.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">Maybe we all use schedule 40 pipe
because that\u2019s what we have always done & locally
available. Isn\u2019t that\u2019s what called recycled ignorance?
Looking for options. In todays world marketplace I am
questioning this approach.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">Thanks in advance.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif"><o:p> </o:p></span></p>
<div
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windowtext 1.5pt;padding:0in 0in 1.0pt 0in">
<p class="MsoNormal" style="border:none;padding:0in"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-family:"Century
Gothic",sans-serif;color:#002060"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">Dana
Orzel Great Solar Works, Inc. <o:p></o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">C -
208.721.7003 <a class="moz-txt-link-abbreviated" href="mailto:dana@solarwork.com">dana@solarwork.com</a><o:p></o:p></span></b></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">Idaho Contractor - # 028765
Idaho PV # 028374<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">NABCEP #
051112-136 <a
href="http://www.greatsolarworks.com"
moz-do-not-send="true">www.greatsolarworks.com</a><o:p></o:p></span></p>
<p class="MsoNormal"><u><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif">"Responsible Technologies for
Responsible People since 1988" </span></u><u><span
style="font-size:14.0pt;font-family:"Century
Gothic",sans-serif"><o:p></o:p></span></u></p>
<p class="MsoNormal" style="background:white"><b><span
style="font-size:18.0pt;font-family:Webdings;color:green">P</span></b><span
style="font-family:"Helvetica",sans-serif;color:navy"> </span><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:green">Please
consider the environment before printing this email.</span><span
style="font-family:"Helvetica",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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