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DC fast charging not as damaging to EV batteries as expected

As convenient as DC fast charging is, there have been lots of warnings that repeated dumping of so many electrons into an electric vehicle's battery pack in such a short time would reduce the battery's life. While everyone agrees that DC fast charging does have some effect on battery life, it may not be as bad as previously expected. Over on SimanaitisSays, Dennis Simanaitis, writes about a recent presentation by Matt Shirk of the Idaho National Laboratory (INL) called DC Fast, Wireless, And Conductive Charging Evaluation Projects (PDF) that describes an ongoing test of four 2012 Nissan Leaf EVs that are being charged in two pairs of two. One pair only recharges from 50-kW DC fast chargers, which the other two sip from 3.3-kW Level 2 chargers exclusively. Otherwise, the cars are operated pretty much the same: climate is automatically set to 72 degrees, are driven on public roads around Phoenix, AZ and have the same set of dedicated drivers is rotated through the four cars. "Degradation depends more on the miles traveled than on the nature of recharging." What's most interesting are the charts on page seven of Shirk's presentation (click the image above to enlarge), which show the energy capacity of each of the four vehicles. When they were new, the four batteries were each tested to measure their energy capacity and given a 0 capacity loss baseline. They were then tested at 10,000, 20,000, 30,000 and 40,000 miles, and at each point, the DC-only EVs had roughly the same amount of battery loss as the Level 2 test subjects. The DC cars did lose a bit more at each test, but only around a 25-percent overall loss after 40k, compared to 23 percent for the Level 2 cars. Simanaitis' takeaway is that, "INL data suggest that the amount of degradation depends more on the miles traveled than on the nature of recharging." The tests are part of the INLs' Advanced Vehicle Testing Activity work and a final report is forthcoming. These initial numbers from IPL do mesh with other research into DC fast charging, though. Mitsubishi said daily fast charging wouldn't really hurt the battery in the i-MiEV and MIT tests of a Fisker Karma battery showed just 10-percent loss over 1,500 rapid charge-discharge cycles.

Nissan VP suggests next Z will offer multiple engines

Roel de Vries, the corporate vice president and global head of marketing and brand strategy for Nissan, told Australia's CarAdvice that as far as he's concerned, any engine in the 370Z "[needs] to deliver on what the car stands for and if the 370Z stands for real performance and real driving I think it doesn't need a V6 to do that." At first read, it could look like de Vries is softening us up for a next-generation Z that doesn't come with a V6, a move that would disappoint a lot of the coupe's fans. Or, what if de Vries was actually getting us ready for a Z with multiple engine options, instead of only a V6, in order to expand its global appeal? That appeared to be the gist of his comments, the exec saying that they couldn't sell a V6-engined Z in Europe, but even if they offer a four-cylinder there, the V6 could live on because, "why should we give it up?" With the coupe's current name a factor of the 3.7-liter displacement of it's V6, though, what is the future for a car with several engine options? Said de Vries, "We [will] definitely keep the Z name, but when we did 350 to 370 it was because of the capacity, but who says the next-generation doesn't have three engines and its not just called Z?" This kind of talk has been going on all year, the real question being how many engines will the car get and what's the endgame. At the beginning of the year, ex product chief Andy Palmer said the car codenamed Z35 would use a "downsized four-cylinder turbocharged engine." In August, Motor Trend reported that the next Z would offer "a mixture of smaller but powerful engines," including a hybrid, but that a V6 would remain the headliner. Two weeks later, MT said that Nissan wanted to transition customers from the naturally aspirated V6 to a turbocharged four-cylinder with the same power, eventually, but would begin with both on the menu. Parallel to that are Shiro Nakamura's out-loud musings about how to merge the next Z and the IDx concepts into "a more affordable, more approachable sports car." The answers, whatever they are, will be a big deal for the brand.

Nissan Leaf sales get January jump as Chevy Volt trends downward

The cold January sales dip hit both the Nissan Leaf and the Chevy Volt last month, but when compared 2014 to 2013's first-month-of-the-year sales totals, one of the two early plug-in vehicles obviously came out on top. The top Leaf market also shifted away from Atlanta for the first time in months. Last year, the Leaf sold just 650 units in January, but it managed to move 1,252 last month, a 92.6-percent increase over 2013 but a big drop from the 2,529 sold in December 2013. Paige Presley over at Nissan told AutoblogGreen that the Leaf has now broken sales records for 11 months straight and that, "we see unique seasonality with some December pull-ahead demand based on federal and state tax incentives." The number one Leaf market also shifted away from Atlanta for the first time in months, moving back to San Francisco. That change could be short-lived. "We had some inventory constraint issues early in the month in Atlanta with end-of-year demand depleting stock," Presley said. "By the time we resolved that, the weather hampered sales." There was not as much good news on the Chevrolet front. Last month, the Volt sold 918 units, down from 1,140 in January 2013 and 2,392 in December 2013. It also marks the first time the Volt has sold in the three-digit range since January 2012, when it sold 603 copies. That string of solid months means that the plug-in hybrid has a roughly 12,000-unit lead over the EV since the two cars brought plug-in vehicles back to the mass market all the way back in December 2010. We will have our full report of January's green car sales up soon.