First the rated power of a turbine is a best case scenario.
No turbines on roof.
It s a measure of how much power the turbine will generate at the highest wind speed that the turbine can tolerate.
If you decide to add more turbine vents to your roof be sure to buy ones that are aluminum.
A turbine may fail to spin if the bearings become rusty or obstructions such as ice leaves or twigs have become wedged into the turbine.
Examine the turbine from the exterior from the roof.
As the wind moves across your rooftop it turns these turbines and draws air up out of your attic area.
These will not rust.
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Aluminum no rust.
In addition pay attention to the maximum roof pitch that will work with the turbines.
But the fact is neither of those conditions are likely to occur on a rooftop.
Turbine vents do indeed look like small wind turbines installed on your roof.
The turbines are adjustable so that the spinning part is level even though the roof is slanted.
All things being equal wind driven turbine vents also known as a whirlybird roof vent do move more air than flat vents but only when the wind blows.