Textured vs smooth glass. Jay Peltz power.
> On Mar 28, 2015, at 6:17 AM, "[email protected]" <[email protected]> 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, <[email protected]> > <[email protected]> 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" <[email protected]> > Date: Fri, March 27, 2015 10:32 am > To: "'RE-wrenches'" <[email protected]> > > 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:[email protected]] On > Behalf Of [email protected] > 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: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/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: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/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: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org >
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