I am betting on the frameless glass on glass module with un-textured glass. Lumos, Trina, Silicon Energy, ...
On Sat, Mar 28, 2015 at 8:17 AM, d...@solarwork.com <d...@solarwork.com> wrote: > I would be curious to hear if there's a difference in how different > manufacturers modules hold snow and ice, > Has anyone seen particular module manufacturers that tend to hold more > snow ? > this would be really good information for those of us in snow country > > Dana Orzel 208.721.7003 > Encourage Free Thinking Self Responsible Free Range Children > > On Mar 27, 2015, at 9:59 AM, <d...@foxfire-energy.com> < > d...@foxfire-energy.com> wrote: > > My customers neighbor has 1.1k of 110W panels on a tilt up rack set at > about 45° (Some 20° from the roof). Her array pretty much stayed clear all > winter with minimal futzing. My customer has a 7.2k array (Four rows of > six) in portrait, mounted on unirack solar mount on an asphalt tile roof at > around 45° (Off Grid), on an unheated garage. My customers panels got a > thin coat of ice on the array early on that held some 12'' of snow all > winter. We did set it up so the bottom two rows were on their own CC and > could be cleared from the ground, but they never did totally clear. The > neighbor now wants to expand her system, is willing to build a shed for the > array, but wants me to elevate the array as far off the roof as possible > (and minimize costs). I'm working on my diplomacey here. I suggested it > might be a combination of factors that contributed to my customers array > not sheding, but the neighbor insists it has something to do with the array > being open backed. I offered to put it out to the group for opinions. > Thanks db > > > > Dan Brown > Foxfire Energy Corp. > Renewable Energy Systems > (802)-483-2564 > www.Foxfire-Energy.com > NABCEP #092907-44 > <sigimg0> > > > -------- Original Message -------- > Subject: Re: [RE-wrenches] Tilt Racking vs Roof Mount for Shedding snow > From: "Dave" <d...@independentpowerllc.com> > Date: Fri, March 27, 2015 10:32 am > To: "'RE-wrenches'" <re-wrenches@lists.re-wrenches.org> > > Dan, > > What do you mean by "tilt up racking". Would an example be a rack that > adds 15 degrees to a 5/12 roof? Good idea (as long as wind load is taken > care of) for cold snow country (certainly for off grid) to get the tilt > angle higher which helps with snow shedding. BUT if it's super cold like > this winter here in northern New England nothing helps as much as a snow > rake. > > On a side note. I had a couple of monitored grid tied systems with second > story roof top arrays that produced very little power from January through > second week of March. 80% less kWh than similar first story roof top arrays > where the homeowner raked off snow. It was so cold that in one period this > winter that it did not get over 30 degrees F for 48 consecutive days here, > with many nights at 15 to 30 below zero. February was the coldest on record > (since 1886) with temps that were 15 degrees below average for the month. > No snow shedding going on at all. > > On another type of array. My adjustable ground mount here set at 90 > degrees had a great winter as I regularly saw 1,750 to 1,950W out of my > Apollo CC from a 1,440W array on sunny days because of MPPT and the > reflective bounce of sunlight off the snow in front of the array. I never > have to touch those modules from mid November, when I tilt them to 90 > degrees, until after it stops snowing significantly (mid April usually). > > Best, > Dave > > David Palumbo > Independent Power LLC > 462 Solar Way Drive > Hyde Park, VT 05655 > 802-888-7194 > > > > *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org > <re-wrenches-boun...@lists.re-wrenches.org>] *On Behalf Of * > d...@foxfire-energy.com > *Sent:* Friday, March 27, 2015 8:19 AM > *To:* RE-wrenches > *Subject:* [RE-wrenches] Tilt Racking vs Roof Mount for Shedding snow > > > > Hi Guys, I have a customer who seems convinced that tilt up racking sheds > snow better than conventional roof mounted arrays (irregardless of angle or > panel manufacturer). Anyone else find this is true? Thanks db > > > > Dan Brown > Foxfire Energy Corp. > Renewable Energy Systems > (802)-483-2564 > www.Foxfire-Energy.com > NABCEP #092907-44 > <image001.png> > > ------------------------------ > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > > -- Shine On! Kris Schmid Legacy Solar, LLC 864 Clam Falls Trail Frederic, WI 54837 www.legacysolar.com 715-653-4295 NABCEP Certified PV Installer Licensed Wisconsin Master Electrician BSEE
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