flush mount pv
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ws9876
Solar Expert Posts: 440 ✭✭✭
My roof is at 22 degrees exactly south. I am right on the 45 parallel in the west US.
I really dont like the look of tilt racks and would not use them for other reasons too.
How much will I lose on PV production if I go with the 22 deg. angle????
and what fasteners are best for metal roofs with the standard profile for metal..
ie not the flat panel metal stuff with the vertical tabs...
I really dont like the look of tilt racks and would not use them for other reasons too.
How much will I lose on PV production if I go with the 22 deg. angle????
and what fasteners are best for metal roofs with the standard profile for metal..
ie not the flat panel metal stuff with the vertical tabs...
Comments
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Re: flush mount pv
My favourite angle calculator: http://www.macslab.com/optsolar.html
Could you stand some slightly uneven legs to give it another 20 degrees tilt? You're going to have a fair drop off in Winter at 22.5, but maybe that's not an issue for you.
Sorry I can't advise on metal roofs; never used any. -
Re: flush mount pv
Just used PV Watts, they will calculate it for you. they even take into consideration the local weather effects. For example in Seattle the optimal angle is less then Latitude. This is due to the cloudy weather.
Check out PV watts... -
Re: flush mount pvwhat fasteners are best for metal roofs with the standard profile for metal..
ie not the flat panel metal stuff with the vertical tabs...
This kind of metal? If so here's how mine is mounted.
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Re: flush mount pvMy roof is at 22 degrees exactly south.
How much will I lose on PV production if I go with the 22 deg. angle????
.
(85-25 )* -0.5%= -30%. Now mounting on a metal roof is a problem. The tin gets very hot in the sun too so the air warms up above ambient thus reducing any natural convection cooling action. Some solar enthusiasts have painted the roof area below the panels white to reduce the metal roof temperature in the sun. -
Re: flush mount pv
The other thing to consider is if you electric loads are summer or winter dominated.
Will this be a grid tied system?
If grid tied depending on your electric companies net metering rules you may want to adjust the system to meet peak loads.
There certainly is a lot of factors to consider.
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