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Basically the system uses (2) motor/generators. One on the crankshaft (on the Williams F1 car anyway) & one somewhere else attached to a flywheel. When storing energy under braking the generator on the engine spins the motor hooked to the flywheel, making it spin really fast. When the button is pushed, the generator extracts kenetic energy from the flywheel & powers the motor on the crankshaft.
Which is worse, the gyroscopic affect from the flywheel or the drawbacks of batteries?
F1 KERS system using batteries run close to 400V from what they say. Both Ferrarri's & Renault's systems require coolant be run to the batteries. McLaren's does not. I heard somewhere that the batteries liked to be hot, but not too hot was the reason for the coolant.
Don
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