I have a roof that faces just about 250 deg SW (true). I'm in Houston so let's call it 30 deg latitude. Figuring the tilt isn't difficult. And, from what I've been reading, a fixed tilt (like my solar exhaust fan up there) gives about 71% efficiency.
What I'm looking for is: what is the efficiency if they are NOT tilted? Everyone assumes you 'can' tilt, but just for argument's sake I'm trying to see the difference if left flat on the roof, pointing 250 deg on a standard 8/12 roof.
What I'm looking for is: what is the efficiency if they are NOT tilted? Everyone assumes you 'can' tilt, but just for argument's sake I'm trying to see the difference if left flat on the roof, pointing 250 deg on a standard 8/12 roof.
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