electric fans
*The fan is designed to move air
*It won't be efficient as a 'turbine'
*The best turbine is 57% mechanically efficient
*The motor as a generator might be 95% efficient
*Of the power you put in a battery you can get about 80% back out
*0.57X 0.95X 0.80 = 43.3@ mechanical efficiency,so with a perfect turbine behind the grille you'd get 43 % of the kinetic energy .
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