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Electric car claims a step too far?

Yet another concept has burst on to the scene promising drivers some incredible performance statistics – however, are these claims out of reach?

first suggested that it would make the ‘world’s fastest electric car’ around six months ago but at that point hadn’t released many technical details. Now it is promising a “nanotechnology rechargeable lithium battery pack” that can be recharged in just 10minutes on a standard 110 outlet and that produces a 150-200mile range on a single charge.

According to a Press release from the company, in a typical eight hour day the car using this technology can travel for 200 miles, be charged for 10 minutes and then drive again for 200 miles.

However, some online critics have questioned these claims pointing out that there would need to be a vastly superior battery technology to make this achievable. Even the number of amps that would have to be pumped through a 110volt is questionable.

Nevertheless, the Shelby Super Car does have a well respected powertrain that is scalable from 200 horsepower for economy and midsize cars to 500 horsepower for light trucks and SUVs. It can even be brought up to 1,200 horsepower for heavy duty equipment, buses, etc.

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Author: Paul Lucas, January 24, 2009
Filed under: Electric cars,Green cars,Latest news

1 Comment »

These claims are not a step too far, they are MANY steps too far. 200 miles is an achievable range, given a battery pack of about 50kWh — roughly the same size as that in the Tesla. However, charging such a pack in 10 minutes from a 110 volt outlet is not even remotely possible. (BTW, If such a pack were used in a way that took advantage of the car’s 500 hp motor, then the range would be far lower, just as it is in the Tesla when driven aggressively.)

A standard 110 volt outlet (as used in the US) is usually rated for 15 amps, and rarely for 20. Best case recharge rate would be 110 x 20, or 2.2 kW. Thus, the best one could obtain would be (50 / 2.2) or 22.7 hours, from a standard outlet. In the US, clothes dryer outlets are 220V, 30A, which could provide (50 / 6.6) or 7.6 hour recharge.

There are 10-minute-charge-battery technologies available, (e.g. Altair Nano) but charging stations capable of that rate are not generally available. 480 V 600A service (used in heavy industry) would provide almost sufficient capacity: about 130 times the rate (in watts) available from a standard 110 V outlet.

Another science fiction aspect of the car was pointed out in their July 2008 press release, (http://www.shelbysupercars.com/news-071208.php)in which they claimed that the car would “feature a revolutionary power source allowing for extended time between charging intervals with the possibility of several years between charging”. If by “charging” they mean storing of electricity, then this claim is obviously nonsense. A nuclear reactor could perhaps operate for years on one “charge” of uranium but imagine the engineering challenges and regulatory hurdles.

I have not read elsewhere that the powertrain is is “well-respected”. In general, ludicrous claims tend to erode, rather than support, respect.

Comment by Ken Fry — January 27, 2009 @ 6:48 pm

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