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Investigators Find No Defect Trend With Tesla Motors' Model S

Federal safety investigators said Friday they have found no apparent defect trends in the Tesla Model S, an electric luxury car that has its share of fans and critics. The National Highway Traffic Safety Administration closed a four-month investigation into whether the car's batteries were at heightened risk for underbody strikes and subsequent fires. Even though no defect trend was found, Tesla Motors said in a written statement it would further protect the bottom of its cars with a reinforced underbody shield. The California-based automaker started adding the shields on March 6 and will retrofit older models free of charge. It will also increase the ground clearance of new cars. "This fix should eliminate the potential of a battery-pack fire under all but the most extreme circumstances," said Karl Brauer, a senior analyst at Kelley Blue Book. Although there are more than 194,000 car fires in the United States every year, NHTSA investigators began a preliminary investigation into potential trouble on Nov. 15, 2013 following two Model S fires, one in Tennessee and one in Washington. No one was injured or killed in either fire. Roadway debris punctured the battery pack near the front of the compartments in both cases, damaging the batteries' lithium ion cells that then began "thermal runaway" events. The opposite ends of the debris had dug into the pavement and jutted upward. Tesla called this a "piking effect." The company said it has conducted 152 vehicle level tests, and that the new shields prevented any damage or penetration of the new shields. The first is a rounded, hollow aluminum bar that's followed by a titanium plate. The third layer of protection is made of solid aluminum. (There's video of the new plates in action on the Tesla Motors website). "We have tried every worst-case debris impact we can think of, including hardened steel structures set in the ideal position for a piking event," Tesla Motors founder Elon Musk wrote on the company's blog," essentially equivalent to driving a car at highway speed, into a steel spear braced on the tarmac." Approximately 15,805 vehicles are eligible for the upgrades, which NHTSA says should reduce the frequency of underbody strikes and subsequent fire risks. But the agency did note that the closing of the investigation did not necessarily constitute a finding that a defect does not exist. "The agency reserves the right to take further action if warranted by new circumstances," it said.

Elon Musk: Tesla Model E will be 20 percent smaller than Model S [w/video]

Somewhere between a Lexus CT 200h and an Acura ILX. But a little quieter and definitely bigger than a breadbox. That's the best comparison we could come up with when trying to get an idea of how big Tesla's more moderately priced sedan will be when it hits the market sometime around 2016. Tesla Motors chief Elon Musk, speaking to the California Public Utilities Commission recently, estimated that the Model E will be about 80 percent the size of the Model S sedan. You can see the video of this below. Now we're not sure exactly what that means, but we can practice a little geometry with the Model S's 196-inch length and 77-inch width and have some fun with the possibilities. And a quick perusal of sports sedans will reveal that the Model E's footprint will be a little bigger than the Lexus in question and slightly more petite than the ILX. Either way, Musk's estimate rounds out the equation of sorts for the Model E, even though he doesn't use that name in the video below. The car will have a minimum 200-mile range, Musk said (perhaps from a 48-kWh pack?) at about half the cost. And with 80 percent of the size. As for when we'll start seeing sales of the Model E, which is supposed to start at $35,000, that deadline has migrated over the years from as late as 2017 to as early as next year and then back to 2016. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.

Recharge Wrap-up: Tesla battery drain reported; ELF two-seater solar trike

Biofuel company KiOR has filed for bankruptcy. KiOR, which was born out of a partnership between Khosla Ventures and Dutch biofuel startup BIOeCON, has debts numbering $261.31 million, with just $58.27 million in assets. The company produced biocrude from cellulosic biomass, but was unable to meet its production targets at its facility in Columbus, MS, and was also facing quality problems and accused mismanagement. KiOR shuttered its biocrude plant earlier this year, and suffered a huge loss in stock value. Read more at Gigaom. Some Tesla Model S owners are complaining again of "vampire" drain during sleep mode. Since downloading the Firmware 6.0, some drivers have reported a battery draw, even when set to "sleep always." Losses can be up to 12 miles of range from sitting overnight, and the latest versions of 6.0 haven't seemed to have solved the problem. Interestingly, the problem isn't affecting all Model S owners. Also, battery draw problems have been reported in the past, which Tesla took steps to fix in previous firmware updates. Read more at Inside EVs. Daimler's Car2go carsharing service is expected to reach 1 million users by the end of the year. The company currently reports 900,000 users worldwide. Car2go operates in 29 cities in North America and Europe, with plans to expand operations to China. "China might be risky, but it also brings lots of opportunities," says Daimler's Rainer Becker. While Car2go has yet to make a profit as a whole, it is moving in that direction, with Becker saying some cities' operations are already profitable. Read more at Automotive News Europe. The ELF solar- and human-powered trike from Organic Transit is now available as a two-seater. The ELF 2FR, as it is called, is a package that adds a rear seat behind the driver of the pod-shaped EV to allow for eco-friendly transport of two adults. The standard ELF retails for $5,495, and the upgrade to the 2FR adds another $499 to the price, which seems like a small premium for doubling the occupancy. Organic Transit hasn't released all the details on its website for the 2FR yet, but the standard ELF charges via outlet or 100-watt solar panel, goes 20 miles per hour and gets the equivalent of 1,800 miles per gallon (though adding the weight of another adult will certainly change those mileage numbers). Check out the Organic Transit's ELF 2FR in the videos below and read more at Treehugger. VIA Motors has received EPA certification for its range-extended electric van.