How High Above The Roof?

[danpolar]

I am trying to figure out how important panel height above the roof is for panel efficiency in a relatively hot area like Central Florida.

Has anybody done research to show the efficiencies at say 1", 2", 3", etc.? I guess the main problem would be during the three or four hottest months.

Also, by raising the height further above the roof, aren't you also altering the wind resistance of the panels and putting more stress on the mounting hardware?

I am thinking that Nevada Wind & Sun should know something about blazing heat.

[Mike90250]

4" to 6" is the normal, too low, and you dont get enough air movement, too high is pointless.

[russ]

Too low and trash such as leaves will have more of a tendency to get stuck under the panels as well.