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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's new GT-R boss says next car will go for more volume

Since its introduction in 2008, the Nissan GT-R has seen a steady increase of power and price almost every year, but the big news for the next-gen supercar might be an increase in production. Automotive News recently spoke with newly appointed GT-R chief engineer Kinishi Tanuma who said Nissan needs "more of a volume car." Nissan has sold a little more than 2,000 GT-Rs in the US since 2012 - 1,188 last year and 952 so far this year.
Of course, a key limiting factor in the GT-R's production is its hand-built engine. Currently, only four people are qualified to build the GT-R's twin-turbo V6, but Tanuma says a fifth is in training. Even if production numbers are raised, Nissan also wants to add more quality and value into the GT-R. There is still no word as to what kind of timeframe Nissan is looking to start pumping out more GT-Rs, but with a new Nismo model rumored to be bringing a two-second 0-60 time, demand is sure to be on the rise.

The Scoot Quad is Nissan's small step toward EV car sharing

Halfway up Laguna Street, the panic set in. I might not make it up this hill. With my foot depressed all the way to the floor, I sucked in my stomach and started to pray. Yet again, I found myself in an unconventional way to get around on four wheels – but this time, I was on my own, and behind the wheel. Meet the Scoot Quad, aka Nissan New Mobility Concept, aka Renault Twizy. The many aliases reflect the path of descent from its development as a quirky French electric vehicle to its proliferation as a model for car sharing. The Quad resides in San Francisco as part of the Scoot fleet of shared electric vehicles and it's most certainly not for sale. As the line blurs between those who share cars for personal reasons and those who use them for business purposes, Scoot and Nissan came to an agreement in which a small number of New Mobility Concepts would join the Scoot fleet – which currently includes over 300 motorbikes. The added value of Scoot is the capacity for one-way rentals around the city, as well as a dedicated network of charging stations. "We think it's just the best way to get around the city for everyone," said Scoot fleet vice president Mike Waltman, explaining how 10 New Mobility Concepts made their way to San Francisco. Charging time is about four hours on a Level Two charger, made possible through Scoot's network of stations around the city. The one-plus-one Twizy has been in production since 2012 and on sale in certain overseas markets, but it's entirely new for the United States, and it wears the Nissan badge here – kind of. No major changes were made to the Twizy when it became the New Mobility Concept, and similarly none were made in its "transformation" to the Quad. It sports the same insectile shape and the rear profile of a top hat, as well as an identical powertrain: a 13-kilowatt motor that produces 17 horsepower, routed to the rear wheels through a single-speed automatic transmission. Charging time is about four hours on a Level Two charger, made possible through Scoot's network of stations around the city. Its top speed is 50 miles per hour, but Nissan installed a governor at 25 mph to conform to US low-speed vehicle requirements. New Scoot members are required to successfully pass an exam before beginning to use the service, so that was my first order of business. After spending about 35 minutes going through a series of informational videos on the Scoot app, as any new member would do, I was ready to ride Scoot motorcycles.