Re: How Not To Save Detroit
- From: Bernd Felsche <berfel@xxxxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 30 Jun 2009 08:49:52 +0800
Jim Yanik <jyanik@xxxxxxxxx> wrote:
kludge@xxxxxxxxx (Scott Dorsey) wrote:
N8N <njnagel@xxxxxxxxxxx> wrote:
On Jun 29, 12:12=A0pm, ben91932 <benteac...@xxxxxxxxx> wrote:
If I could afford a Tesla, and could ensure that I wouldn't ever
run out of juice while driving it, =A0I'd buy one too.
I dont understand the trepidation about the range issue.
Your car has a gas gauge and the EV has a state-of-charge meter.
You'd have to be pretty *special* to run out of juice is either one,
wouldnt you?
let's say range of electric car is 100 miles. I need to go somewhere
120 miles away. My gasoline car has a range of almost 400 miles, and
can be refueled in 5 minutes. Now do you understand my concern?
Right, that's why you need an electric car that can be refueled in 5
minutes as well... either with a high current charge
70 KWH or more in FIVE minutes? Utopian wishful thinking.
Doesn't scale ... charging stations consuming several megawatts of
electricity? A dozen "pumps" operating simultanousely would draw a
10 megawatts. Electricty grid isn't up to it.
or a high voltage
charge or by physically removing the battery pack from your trunk and
dropping a new one in with a crane.
Rather hazardous,besides being a PITA.
Also doesn't scale. Again; the number of customers that need to be
served in a day requires a huge infrastructure; and somebody is
going to get a worse battery pack than what they leave... the things
do have a finite life. Abuse of packs can't be easily detected until
it's too late.
Right now we have charging time down to an hour or so, which is a lot
better than the overnight charges that used to be required. We're
most of the way there.
--scott
That's BULL that one can recharge their car's battery pack in a
"hour or less". your cordless drill-driver,yes,your car's battery
pack,no.
Tesla says 3.5 hrs IF you use their special High-Power Connector
and a 70A 240VAC high current source.
There's also a serious fire hazard with rapid charging.
And you can't recharge most lithium chemistries when it gets to be a
little warm. (>35 degrees C) Even the rate of discharge is limited
at elevated temperature.
NiMH has similar problems. Hence the airconditioning for the Prius'
battery.
--
/"\ Bernd Felsche - Innovative Reckoning, Perth, Western Australia
\ / ASCII ribbon campaign | The growth of knowledge depends
X against HTML mail | entirely on disagreement.
/ \ and postings | -- Karl Popper
.
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