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Also, when you're calculating snow load, the load is decreased when on an angle. Simple Trig, the snow load is straight down(gravity), so if the panel is at an angle it only sees the portion of the load straight down. Same as you would figure wind loading with an array. I'll send anyone interested a sheet on how to calculate this, if you're not seeing it.<div><br></div><div><div> <span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div>R. Walters</div><div>Solarray.com<span class="Apple-tab-span" style="white-space:pre"></span></div><div>NABCEP # 04170442<span class="Apple-tab-span" style="white-space:pre"><span class="Apple-style-span" style="white-space: pre; "> </span></span></div><div><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span> </div><br><div><div>On Jul 28, 2009, at 8:57 AM, Greg Egan wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"> <font face="Arial">My solution to snow load issues is to install modules on racks so they can tilt to 90 degrees when it's snow season. I guess it depends on where you are but in the areas of Alaska where we work we tell people to tilt your array to 90 in the fall and kick it back to lat-15 in the late spring. They gain some from snow reflection and lose some because they're not always at the best angle but they make a lot more power than modules installed under the snow.<br> <br> We like top of pole mounts that allow for an 85 or 90 degree setting for the snowy season. We've done some installs of modules on the s side of buildings where we leave them basically plumb during snow season and kick them out like an awning the rest of the year. Sometimes there's a nice 2' overhang on the roof that keeps the snow off the wall mounted array even if it's kicked out maybe to 75 degrees or so. Roof installs are our least favorite for a number of reasons.<br> <br> I know the architects among us love to not see those ugly modules but I generally try to convince my clients that their neighbors will think they're stupid if they see their PV panels under the snow. <br> <br> Believe it or not we get most of our annual sunshine in the spring. It's clear and cool. June has more "possible" sun hours but is generally cloudier so the NREL 30 yr averages show spring to be the most productive for us. Don't want to miss out on that power if we can help it!<br> <br> Best,<br> <br> Greg<br> <br> <br> </font> <pre class="moz-signature" cols="72">Greg Egan
Remote Power Inc.
981 Gold Mine Trail
Fairbanks, AK 99712
P. 907.457.4299
U.S.Distributor for Outback Power Systems and other premium power equipment.</pre><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">_______________________________________________</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">List sponsored by Home Power magazine</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Options & settings:</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">List-Archive: <a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">List rules & etiquette:</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">www.re-wrenches.org/etiquette.htm</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Check out participant bios:</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">www.members.re-wrenches.org</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div> </blockquote></div><br></div></body></html>