<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body><div><div style="font-family: Calibri,sans-serif; font-size: 11pt;">I have seen published an adjustment factor used when calculating pitched roof snow loads that is used to modify the published flat snow load value.<br>Can't put my finger on it right now, but you could probably get more information with an intern search.<br>I have used it on ground mount calculations.<br><br>Sincerely,<br>Glenn Burt<br>Sent from my 'smart' phone so please excuse grammar and typos.</div></div><div dir="ltr"><hr><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">From: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;"><a href="mailto:ray@solarray.com">Ray Walters</a></span><br><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">Sent: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;">\u200e4/\u200e27/\u200e2015 12:33</span><br><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">To: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;"><a href="mailto:dana@solarwork.com">dana@solarwork.com</a>; <a href="mailto:re-wrenches@lists.re-wrenches.org">RE-wrenches</a></span><br><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">Subject: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;">Re: [RE-wrenches] Extreme snow load ground mount?</span><br><br></div>Gravity only acts downward. The modules are rated to 113 PSF which is <br>with the module laying flat. If the module is at an angle, it can take <br>more downward force.<br>For instance if it is at 70 degree tilt, It could take a downward force <br>of 113 PSF / cos 70 or 330 PSF.<br>Its possibly reasonable to assume that the snow might not slide off, but <br>the total snow load is not going to act perpendicular to a tilted module.<br>If the AHJ wants to argue the point, ask him what the snow load <br>requirements are against a surface of a wall. A vertical surface would <br>only see wind loading, not snow loading.<br><br>R.Ray Walters<br>CTO, Solarray, Inc<br>Nabcep Certified PV Installer,<br>Licensed Master Electrician<br>Solar Design Engineer<br>303 505-8760<br><br>On 4/26/2015 2:32 PM, Dana wrote:<br>><br>> Nice rack!<br>><br>> However if the panels are not rated for more the 100-113 PSF, the <br>> design is still not acceptable if the AHJ wants 420 PSF right?<br>><br>> Q \u2013 What is the stoutest PV module out there?<br>><br>> ----------------------------------------------------------------------------<br>><br>> Dana Orzel<br>><br>> Great Solar Works, Inc - NABCEP # 051112-136<br>><br>> E - dana@solarwork.com - Web - solarwork.com<br>><br>> O - 970.626.5253 C - 208.721.7003<br>><br>> "Responsible Technologies for Responsible People since 1988"<br>><br>> *P*Please consider the environment before printing this email.<br>><br>> *From:*RE-wrenches [mailto:re-wrenches-bounces@lists.re-wrenches.org] <br>> *On Behalf Of *Jonathan Hill<br>> *Sent:* Saturday, April 25, 2015 5:33 PM<br>> *To:* RE-wrenches<br>> *Subject:* Re: [RE-wrenches] Extreme snow load ground mount?<br>><br>> Lars-<br>><br>> What Bill said. Done it several times without incident.<br>><br>> Jonathan Hill, senior solar applications engineer<br>> 530-559-3781<br>> solarjon@gmail.com <mailto:solarjon@gmail.com><br>><br>> On Apr 25, 2015, at 12:48 PM, Dana <dana@solarwork.com<br>> <mailto:dana@solarwork.com>> wrote:<br>><br>> What is the highest PV module snow rating? 113 PSF is the highest<br>> I have seen I here in CO & ID 100 is the highest required .<br>><br>> __________________________________________________________<br>><br>> *Dana Orzel*<br>><br>> Great Solar Works, Inc - *NABCEP # 051112-136*<br>><br>> dana@solarwork.com <mailto:dana@solarwork.com> -www.solarwork.com<br>> <http://www.solarwork.com/><br>><br>> *O*- 970.626.5253 *F*- 970.626.4140 c*-*208.721.7003<br>><br>> *_"Responsible Technologies for Responsible People since 1988_**_" _*<br>><br>> *From:*RE-wrenches<br>> [mailto:re-wrenches-bounces@lists.re-wrenches.org]*On Behalf<br>> Of*bruce@willpowerelect.com <mailto:bruce@willpowerelect.com><br>> *Sent:*Saturday, April 25, 2015 1:41 PM<br>> *To:*RE-wrenches<br>> *Subject:*Re: [RE-wrenches] Extreme snow load ground mount?<br>><br>> Would this work for you?<br>><br>> http://willpowerelectric.blogspot.com/p/h2e-is-harsh-to-extreme-solution.html<br>><br>> Bruce Fiero-RMI<br>><br>> <image002.jpg><br>><br>> *Willpower Electric LLC*<br>><br>> 4115 S Pacific Hwy<br>><br>> Medford, OR 97501-9103<br>> *Phone:*541-535-3965<br>><br>> *Fax:*541-512-0061<br>><br>> *Email:*bruce@willpowerelect.com <mailto:bruce@willpowerelect.com><br>><br>> *Web:*www.willpower-electric.com <http://www.willpower-electric.com/><br>><br>> Oregon Electrical Contractor C681<br>><br>> CCB 191852<br>><br>> DUNS 191470363<br>> NABCEP Certified PV<br>><br>> Trade Ally of Energy Trust of Oregon<br>> Oregon Solar Tax Credit Certified Technician<br>><br>> *"I'd put my money on the sun and solar energy. What a source of<br>> power! I hope we don't have to wait until oil and coal run out<br>> before we tackle that." T. Edison, 1931*<br>><br>> -------- Original Message --------<br>> Subject: Re: [RE-wrenches] Extreme snow load ground mount?<br>> From: "frenergy" <frenergy@psln.com <mailto:frenergy@psln.com>><br>> Date: Fri, January 16, 2015 9:17 pm<br>> To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org<br>> <mailto:re-wrenches@lists.re-wrenches.org>><br>><br>> \ufeff<br>><br>> Lars,<br>><br>> Yes, the only way you can even consider an install like<br>> this is a pole mount, with a steep tilt in the winter to shed<br>> most of the snow. It would help to know if the place will be<br>> used in the winter or summer and how big of an array in KW or<br>> Sq Ft. Customer would have to understand that you cannot<br>> guarantee it...there are some combinations of<br>> wind-snow-temp-moisture that make snow cling to anything. If<br>> this is permitted, start dropping off cookies to an engineer.<br>><br>> Bill<br>><br>> Where the Sierra meets the Cascades<br>><br>> ----- Original Message -----<br>><br>> *From:*Lars Ortegren <mailto:lars@cal-solar.com><br>><br>> *To:*RE-wrenches@lists.re-wrenches.org<br>> <mailto:RE-wrenches@lists.re-wrenches.org><br>><br>> *Sent:*Thursday, January 15, 2015 11:30 AM<br>><br>> *Subject:*[RE-wrenches] Extreme snow load ground mount?<br>><br>> Wrenches,<br>><br>> I have a fun one for you. We have a couple of potential<br>> clients who live in the high Sierra with a 420 LB design<br>> snow load. After hunting around, not even a three rail<br>> system comes close with any module I can find, so now I'm<br>> looking for a pole top that will dump the snow, and still<br>> handle 120 mph winds. Any ideas? I would just say sorry,<br>> no solar for you,but like many of you I love a challenge.<br>><br>> --<br>><br>> */Lars Örtegren/ President/*<br>><br>> California Solar Electric Company<br>> <http://www.californiasolarco.com/><br>><br>> PO Box 480/149 E.Main St<br>> Grass Valley, CA 95945<br>> Phone : (530)274-3671 Fax: (530)274-7518<br>> */California C-10 Electrical Contractor #779624/*<br>><br>> ATTENTION*<br>> *This E-mail may contain CONFIDENTIAL INFORMATION intended<br>> only for the use of the Individual(s) named above. If you<br>> are not the intended recipient of this E-mail, or the<br>> employee or agent responsible for delivering it to the<br>> intended recipient, you are hereby notified that any<br>> dissemination or copying this E-mail is strictly<br>> prohibited. If you have received this E-mail in error,<br>> please immediately notify us by telephone<br>> at_ (530)274-3671_ or E-mail l<br>> <http://spratt@nabcep.org/>ars@cal-solar.com<br>> <mailto:ars@cal-solar.com> orcontact@cal-solar.com<br>> <mailto:contact@cal-solar.com>.<br>><br>> <https://www.facebook.com/CaliforniaSolarElectric><br>> <http://www.yelp.com/biz/california-solar-electric-company-grass-valley><br>><br>><br>> ------------------------------------------------------------------------<br>><br>> _______________________________________________<br>> List sponsored by Redwood Alliance<br>><br>> List Address:RE-wrenches@lists.re-wrenches.org<br>> <mailto:RE-wrenches@lists.re-wrenches.org><br>><br>> Change listserver email address & settings:<br>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org<br>><br>> List-Archive:http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html<br>><br>> List rules & etiquette:<br>> www.re-wrenches.org/etiquette.htm<br>> <http://www.re-wrenches.org/etiquette.htm><br>><br>> Check out or update participant bios:<br>> www.members.re-wrenches.org<br>> <http://www.members.re-wrenches.org/><br>><br>> ------------------------------------------------------------------------<br>><br>> _______________________________________________<br>> List sponsored by Redwood Alliance<br>><br>> List Address:RE-wrenches@lists.re-wrenches.org<br>> <mailto:RE-wrenches@lists.re-wrenches.org><br>><br>> Change listserver email address & settings:<br>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org<br>><br>> List-Archive:http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html<br>><br>> List rules & etiquette:<br>> www.re-wrenches.org/etiquette.htm<br>> <http://www.re-wrenches.org/etiquette.htm><br>><br>> Check out or update participant bios:<br>> www.members.re-wrenches.org <http://www.members.re-wrenches.org/><br>><br>> _______________________________________________<br>> List sponsored by Redwood Alliance<br>><br>> List Address:RE-wrenches@lists.re-wrenches.org<br>> <mailto:RE-wrenches@lists.re-wrenches.org><br>><br>> Change listserver email address & settings:<br>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org<br>><br>> List-Archive:http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html<br>><br>> List rules & etiquette:<br>> www.re-wrenches.org/etiquette.htm<br>> <http://www.re-wrenches.org/etiquette.htm><br>><br>> Check out or update participant bios:<br>> www.members.re-wrenches.org <http://www.members.re-wrenches.org/><br>><br>><br>><br>> _______________________________________________<br>> List sponsored by Redwood Alliance<br>><br>> List Address: RE-wrenches@lists.re-wrenches.org<br>><br>> Change listserver email address & settings:<br>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org<br><br><div>[The entire original message is not included.]</div></body></html>