Thursday, January 22, 2009

Tesla Roadster

The Tesla Roadster is an all-electric sports car produced by the electric car firm Tesla Motors and is the first car produced by the company.
The Roadster can travel 244 miles (393 km) on a single charge of its lithium-ion battery pack and accelerate from 0–60 mph (0–97 km/h) in 3.9 seconds. The Roadster's efficiency, as of September 2008[update], was reported as 120 mpgge.It uses 135 W·h/km (4.60 mi/kW·h), battery-to-wheel, and has an efficiency of 90% on average.
The Roadster was developed with design help from Lotus Cars, who supplied the basic chassis development technology from the Lotus Elise. First unveiled to the public on 19 July 2006, series production of the car began on 17 March 2008.
Final pricing for the 2008 Tesla Roadster base model was US$98,000, plus a destination charge of $950. The majority of the first 200 Roadsters ordered by October, 2006, came fully loaded with all optional equipment at a cost of about US$100,000

The roadster is powered by a 3-phase, 4-pole electric motor, producing a maximum net power of 248 hp (185 kW).The Sport Model introduced during the 2009 Detroit Auto Show includes a motor with a higher density, hand wound stator that produces a maximum of 288 hp (215 kW).Both motors are designed for rotational speeds of up to 14,000rpm, and the regular motor delivers an efficiency of typically 90%, or 80% at peak power.The Roadster's 0–60 mph (0–97 km/h) acceleration time is 3.9 seconds for the Standard Model and 3.7 seconds for the 2009 Sport Model. Some prototypes and early production 2008 Roadsters were limited to 5.7 seconds.The top speed is electronically limited to 125 mph (201 km/h). The Roadster covers the quarter-mile drag strip in 12.757 seconds at 104.74 mph (168.56 km/h).The EPA combined range (specifying distance traveled between charges) measured in February 2008 for early production Roadsters was 231 mi (372 km) city, 224 mi (360 km) highway, and 227 mi (365 km) combined (city/highway).In August 2008, additional testing with the newer Powertrain 1.5 resulted in an EPA combined range of 244 mi (393 km).It weighs about 2,700 lbs. (1,220 kg), and is rear wheel drive; most of the car's weight is centered in front of the rear axleTesla Motors refers to the Roadster's battery pack as the Energy Storage System or ESS. The ESS contains 6,831 lithium ion cells arranged into 11 "sheets" connected in series; each sheet contains 9 "bricks" connected in series; each "brick" contains 69 cells connected in parallel (11S 9S 69P). The cells are 18 mm (0.71 in) in diameter and 65 mm (2.6 in) long (18650 form-factor); this type of lithium-ion cell is also found in most laptop computer பட்டேரிஎஸ்.
A full recharge of the battery system requires 3½ hours using the High Power Connector; in practice, recharge cycles usually start from a partially charged state and require less time. A fully charged ESS stores approximately 53 kWh of electrical energy at a nominal 375 volts and weighs 992 lb (450 kg). The Tesla Motors Club bulletin board has estimated the 2008 replacement cost at approximately $20,000; this cost is likely to decline in the future. The ESS is expected to retain 70% capacity after 5 years and 50,000 miles (80,000 km) of driving (10,000 miles (16,000 km) driven each year). Tesla Motors provides a 3 year/36,000 mile warranty on the Roadster with an optional 4 year/50,000 mile extended warranty available at an "additional cost" (2008 Roadster buyers receive the 4/50 extension at no cost while later purchasers need to pay).
The pack is designed to prevent catastrophic cell failures from propagating to adjacent cells, even when the cooling system is off. Coolant is pumped continuously through the ESS both when the car is running and when the car is turned off if the pack retains more than a 90% charge. The coolant pump draws 146 watts.Tesla Motors announced plans to sell the battery system to TH!NK and possibly others through its Tesla Energy Group division. That plan was put on hold by interim CEO Michael Marks in September, 2007

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