[ausev] Electric energy transfer and storage limitations

[John Rumsey]

That's why pure EV's are good only for short hauls.
They have a niche to fill, but my idea is to replace
the standard size and range auto with something
better. Some people have busy schedules and lots of
driving, can't afford a standard type auto and an EV
too or can't wait while recharging. I foresee a mix of
different types of vehicles with different powerplants
and different fuels depending upon their purpose.

Glad to see the figures for pure EV. That's why I
proposed using a portable recharging plant.


--- Gil Dawson <Gil at gil.dawson.name> wrote:

> At 3:26 P +0100 5/15/07, John Rumsey wrote:
> >EV's that I have read about either have low speeds,
> >short ranges, high cost and long recharge times
> [when
> >you can find a place to plug in], or some
> cobination
> >of these.
> 
> Range and recharge times are related to inherent
> limits
> in today's electricity distribution technology and
> batteries.
> 
> A 10-gallon tank of gasoline contains about 360 kwh
> of energy.
> 
> To fill that tank in, say, a minute, requires the
> transmission of
> 21,600 kw worth of gas through the hose during that
> minute.
> 
> Imagine the connectors and cables that would be
> required
> to zap 21,600 kw of electric energy into your car
> for a minute.
> 
> As a point for reference,
> the charger for my S-10E is rated at 6 kw.
> 
> Imagine the battery pack that could store 360 kwh.
> 
> As a couple points for reference,
> 
> The Prius stores about 2 kwh in its 200-volt battery
> pack.
> 
> My EV1 stored about 35 kwh in its 328-volt battery
> pack.
> (Yes: one gallon-of-gas-equivalent.  If it had been
> a gas
> car it would have been EPA-rated at something like
> 100 mpg,
> owing to its many energy-conserving design features
> like
> hard tires and aerodynamic shape.)
> 
> --Gil
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