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How to get incredibly accurate information on your EV's charging power

One would think that paying about $300 to receive a bit of bad news about electric-vehicle charging would be counterproductive. But the fine folks at Teslarati believe that truth is beauty, and they're willing to pay a little extra for the straight dope. There are always losses when taking power from the grid and shoving it into an EV's battery pack. The question is how big are these losses. Teslarati calculated digital read-outs from the dashboard of their Tesla Model S all-electric sedan and found that Tesla builds in about a nine percent efficiency loss when it comes to recharging the car. But the blog thought the Tesla couldn't know exactly what was transpiring between the wall and the battery, so it footed the bill for about $300 to install a digital submetering unit from EKM Metering. With a little calculation, Teslarati was able to figure out after a couple of recharging rounds that the efficiency loss per recharge was closer to 15 percent than nine percent. That means that, instead of paying about 48 cents on the dollar relative to filling up an economy car (factoring in the AAA average price of $3.66 per gallon), Tesla owners are paying about 52 cents on the dollar. Not much compared to paying upwards towards $100,000 for the vehicle itself, but, hey, every cent counts, right? Get all of the details here. Featured Gallery Tesla Model S View 10 Photos News Source: Teslarati Green Tesla Electric recharging

Watch the Jaws of Life tear apart a Tesla Model S

As electric vehicles become more prevalent on the roadways, first responders are facing new - and sometimes unknown - challenges when it comes to intense tasks such as the extrication of passengers trapped inside a car. Advanced Extrication, an online training resource for rescue workers, recently posted a video showing how rescuers should respond to vehicles like the Tesla Model S.
The best way to do such a video, of course, is to actually demonstrate the process, so Tesla donated a new Model S just so the Fremont Fire Department could tear it to shreds as the host explains some of the unique dangers specific to electric cars. The unfortunate demo car looks like it just came off the assembly line, meaning it is completely intact to begin with, but we wonder if it would have been more interesting to see how firefighters deal with the car's wiring and DC-DC converter (and other high voltage components) when the vehicle structure has been compromised.
Either way, the entire 37-minute video (posted below) goes in depth showing what rescuers face as they deal with a growing number of EVs. Of course, if all you want to see is the business end of the Jaws of Life going to town on the Model S' subframe, you should skip to the 27-minute mark.

Tesla Motors stock breaks $200 mark for first time

It seems not that long ago that the air had been let out of Tesla Motors high-flying stock price. The company didn't adequately thrill the market when it disclosed its third-quarter 2013 financial results last November and TSLA price plummeted quickly enough to trigger a temporary halt to short sales. Immediately after that, the infamous Tenessee CarBQ happened, adding to the loss of altitude. Shares that had been, at one point, worth as much as $193.37 spent the last half of November 2013 bumbling along in the $120 neighborhood. If you had chosen that low point to invest, we imagine you are wearing a very self-satisfied smile today. That's because the TSLA stock has more than reversed all previous losses and reached a high of $201.91. The most dramatic part of that rise came this week as the price saw a gain of $30. By the end of the day today, TSLA settled at $196.62, up just six cents from the close of trading yesterday. Whether or not the stock has been buoyed by anticipation of the upcoming fourth-quarter financial reporting – estimated to happen a week from now – is hard to say. Certainly the fears over future battery supply constraints have been calmed, and we expect the upcoming call to have even more concrete details about the giga-factory. If you think you know the reason for the recent rise, please feel free to share with the rest of the class in the Comments. Featured Gallery Tesla Model S View 24 Photos News Source: NASDAQ Green Tesla Electric tsla nasdaq