robert winfield via EV wrote:
There are a few technical problems with flywheel energy storage and moving 

Robert is right. A flywheel in a vehicle has to be gimballed (like a gyroscope) so it can remain upright no matter how the car moves. Its bearing also have to be strong enough to handle bumps and potholes. That's an additional complication, as the flywheel is by definition heavy.

Flywheels also have the problem of being able to dump *all* of their stored energy in a moment (KABOOM!) if something goes wrong. Extreme measures need to be taken to protect against this.

Flywheels make far more sense for fixed installations. They don't need to be gimballed, or handle shock or vibration (short of an earthquake). They can be be buried, to safely contain the debris in case of a failure.

But, an expensieve high-tech flywheel solution probably isn't needed for peak energy storage in a fast charging station. Batteries are going to be cheaper and safer. Batteries that are old, used, or have too low a performance for in-car use will still work fine. Even traditional lead-acid batteries would work, as size and weight don't matter for a stationary application. There are lots of industrial-strength lead-acids that last for decades can happily deliver 1000+ amps.

It is vanity to do with more that which can be done with less.
        -- William of Ockham
Lee Hart, 814 8th Ave N, Sartell MN 56377,
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