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, Thu, 14 Feb 2013 13:27:54
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I certainly agree with your comment on electric cars' general lack of suitability for one-car families and used car buyers looking for a good price. IMHO, this type of car is where the PC was when it was a $10,000 purchase circa 1982. Tesla itself is planning on introducing less expensive models in the years to come.
For a 20k-unit per year sales goal, Tesla Model S is a competitive entry in the $60k range (it saves about $15k in gas cost in the first 100k miles) . In this price range, the usual suspects are 5+6 from BMW, S6+A7 from Audi, E+CLS from MB and GS+LS from Lexus. None of them are 7 seaters like the Tesla. These cars are usually leased commute run-about cars around the city and beltways. People don't usually take them on long road trips. Every 200 miles is about how much I drive before tanking up (at half tank, I seldomly let fuel guage run lower than that. Of course for out of state road trips, a different car or a rental minivan would be a good idea, but for a family that can put down $60k or lease $700/mo for a car, that shouldn't be a major problem.
High speed charging shouldn't be a major problem for the battery. The limiting factor in battery charging time is not how much juice the batteries can take in but how much current the existing building electrical system can deliver: the batteries and wires in this car can delivering 300+kw to the motors when performing at max; that's the equivalent of 2500amp at 120V. Most houses are only wired for 100amp or 200amp service for the whole house. Even at 480Vac, few places have 600+ amps circuits. The charger and the building electric system limit how quickly the car can be charged. Batteries inside are probably charged in parallel, and in turns among different banks. The internal charging DC voltage that the batteries see should be exactly the same whether the external voltage is 480Vac or 120Vac, just different numbers of batteries are charged simultaneously. Topping off then not quickly use up the top-off however could reduce Lithium battery charge capacity. That's probably why the batteries are only charged to 90% in normal operation.
posted by 24.91....
, Thu, 14 Feb 2013 09:31:28
, Thu, 14 Feb 2013 10:15:14, Fri, 15 Feb 2013 05:34:17, Thu, 14 Feb 2013 13:27:54, Fri, 15 Feb 2013 07:17:51, Sun, 17 Feb 2013 10:16:52, Sun, 17 Feb 2013 18:47:29, Fri, 15 Feb 2013 05:37:53, Thu, 14 Feb 2013 10:37:08
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