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Posted by Josepi on April 7, 2010, 10:00 pm
 


I am considering putting my panels on my garage roof. It was design with a
12:12 slope to match my latitude. However, I have severe wind gusts
(90-110km) here for a very long winter, spring season, some years, day after
day.

When you say "flat", do you just mean parallel to the roof surface or did
you imply the "gap" to the roof's surface.

I would be interested in hearing more about your mounting. I have a PV guy
coming, one of these days, to  quote me some racking for my roof in order to
get them out of my courtyard.



Second, I have my panels firmly mounted FLAT on the south-facing roof of a
fairly sturdy outbuilding.  I could get another 10% out of the panels if I
tilted them more to the south, but they are much safer from wind loads and
flying debris where they are.  The potential for hurricane damage (and for
collateral damage to the roof of my house) is one reason why I don't have a
full-blown solar system.

Vaughn




Posted by vaughn on April 7, 2010, 10:24 pm
 




They are mounted directly down on a corrugated metal roof surface.  I built a
frame from the same aluminum track that holds storm shutters around here.  The
bolts go straight through the metal roof into the roof's support.  Of course,
that would never work if snow were an issue.

That roof happens to be slanted slightly south, but not nearly enough for
optimum panel positioning.  It turns out that is just fine for my purposes.  My
batteries are usually full by noon.

Vaughn



Posted by vaughn on April 7, 2010, 11:00 pm
 



Just remembered, I have a picture.  It's really not much to look at!

http://s206.photobucket.com/albums/bb156/wb4uhb/Solar/?action=view&current=Solar013.jpg>

Vaughn



Posted by Josepi on April 8, 2010, 2:00 am
 

Thanx for that!

Yeah, I have a shingled roof and quite new. I know nothing about PV panel
racking but I think I am going to get educated fairly soon. I have 10 larger
panels and want them out of the way. Not sure I want to manuever n a 45 deg
sloped roof though. I have old ankles..LOL

 They have been on various wooden frames over a few years now. Wind
destroyed one frame in my back field and even with the bottom about 30
inches off the ground the snow goes half way up the damn things. My son gave
me snow shoes for christmas one year and they did come in handy...LOL



Just remembered, I have a picture.  It's really not much to look at!

http://s206.photobucket.com/albums/bb156/wb4uhb/Solar/?action=view&current=Solar013.jpg>

Vaughn




Posted by Ron Rosenfeld on April 8, 2010, 1:16 pm
 



My panels are also roof mounted, on a 45 angled roof.  They sit some
inches above the roof line.

We, too, have wind gusts in the range you mention; and this past winter I'm
told that there were even higher wind gusts -- someone said 90 mph (144
km/hr).  But I wasn't here that week so can't confirm that it really
happened at our site.

We've not had any damage to the panels or the roof.  And no roof leaks.

*BUT* there were specs that I obtained (from the architect who designed the
house, and his engineer) regarding the limits on the roof structure with
regard to weight and uplift force issues to ensure that the panels would be
OK in that location.

The panels are mounted on rails, with footings that penetrate the roof
(appropriately sealed with some kind of goop), and are anchored underneath
through wooden blocks that are tied to the roof support trusses.

I suspect that the structure of the roof will be the limiting factor for
you, in terms of putting panels up there.
--ron

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