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This design is all about doing it effectively with less power. There's never been a reason to move away from the current system, because there's always been a powerful generator built into the car.
A little googling around says that a wiper motor, running full out, draws 10-12 amps of 12v power. That's a lot of electrons. So I bet Tesla is actually saying, hey... if we make a wiper system that draws a lot less power, that will save 20 miles worth of range in the rain.
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