Interesting thought. It might be a good alternative.
But I'm thinking that a large battery (e.g. 100kWh) is cheaper, or at
least will be soon. I don't think one needs larger storage than the
largest battery needing a charge. The advantage of an on-site battery or
flywheel, as I think you imply, is to allow a very rapid charge without
putting an excessive load on the power service.
What will happen, though, if a service station has 10 or 15 ESVEs, which
I think would be realistic along freeways. During times of high
occupancy, the overall load will be more uniform. Someone will start
charging, someone will stop. Meanwhile, 10 other cars will be drawing
full power. So, the starts and stops become less significant. In fact, I
suspect a little math would show a battery roughly equal to the capacity
of one car is sufficient regardless of the number of ESVEs.
Anyway, it comes down to which costs less. Again, I'm pretty sure
battery technology will usurp anything mechanical.
Peri
------ Original Message ------
From: "Robert Bruninga via EV" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Cc: "Robert Bruninga" <[email protected]>
Sent: 07-Feb-18 2:30:23 PM
Subject: [EVDL] Fast Charging... (Flywheel?)
https://www.greencarreports.com/news/1115199_what-electric-car-charging-will-satisfy-a-mass-market-twitter-poll-results
I wonder how big a flywheel is needed to store the energy to charge a
250
mile range in 20 minutes?
Since it is fixed, and does not have to be in a vehicle, it might be
the
answer to large charging stations.
When ten TESLAs pull up at ten fast charge cords at the same time, that
is
over a megawatt of needed power... in 20 minutes...
Bob
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