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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.

AAA ranks Tesla Model S P85D best green car of 2015, Versa is best value

Reviewers from all parts of the automotive world just seem to love the Tesla Model S, whether it's the pragmatists at Consumer Reports or the enthusiasts at Car and Driver. You can add one more to that list because the 2015 P85D grabs the top spot in AAA's fifth annual Green Car Guide, after Tesla's win last year too. The organization's ranking of 88 green models also names the 2014 Nissan Versa SV as the best value in the segment. To take the victory, the P85D had to score the most points over 13 categories, including emissions, acceleration and cargo capacity, and it won handily with 94.87 points. There was nearly a tie for second place, though. The 2015 Volkswagen e-Golf SEL Premium scored 85.5 points, and the 2014 BMW i3 narrowly came in third with 85.4. The best value award is based on the as-tested price per point scored. So while the Versa SV only had 64.5 points overall, its low price meant that each one cost just $249. Second place went to the Versa Note SV with 64.63 points at $260 each, and third was the Hyundai Accent GLS with 61.1 points for $269 each. Keep in mind, AAA's ranking doesn't attempt to find the most environmentally friendly vehicle, rather it tests the green car segment to give recommendations to buyers. Battery electric powertrains, compressed natural gas, clean diesel, hybrids, partial zero-emissions vehicles, and simply models with high fuel economy are all counted by the organization. The results are published in a 160-page magazine, which you can read here. It also offers suggestions on economical driving and explains some of the fuel-saving tech currently available. Related Video: Top Green Vehicle is a 2015 Tesla, According to Fifth Annual AAA Green Car Guide ORLANDO, Fla., April 20, 2015 The 2015 Tesla Model S P85D earned the top score in the 2015 AAA Green Car Guide, the motor club announced today. The Palo Alto-based automaker's car is featured with more than 80 other green vehicles in the 2015 AAA Green Car Guide. The best green car value award went to the 2014 Nissan Versa SV. To help those in the market for a green car or truck, the 160-page, comprehensive fifth annual AAA guide reviews 88 battery electric vehicles, compressed natural gas-powered (CNG) vehicles, clean diesels, hybrids, partial zero emission vehicles (PZEVs), and vehicles with high fuel economy.

Nissan will expand free* charging incentive to 25 Leaf markets

Nissan has proof that giving away a bit of electricity makes buying a new Leaf all the more enticing. Thanks to a deal that offers free charging to some Leaf owners in Texas, one dealer there claims his Leaf sales have tripled. We don't see national sales climbing quite that high starting July 1 2014, but an announcement made today at the New York Auto Show will likely give the EV a boost. New Leaf buyers will get to charge for free at public chargers for two years. Within limits: a max of 30 minutes at CHAdeMO and an hour at Level 2 stations. Nissan will expand its "No Charge to Charge" promotion to at least 25 markets across the US. The deal means that new Leaf buyers will get to charge for free at public chargers that accept the new EZ-Charge card, within limits. That means a maximum of 30 minutes at CHAdeMO DC fast chargers and just one hour at Level 2 stations, Brendan Jones, director of Nissan EV infrastructure strategy and development, told AutoblogGreen. This should be plenty of time, Jones said, since the average Leaf driver comes to a CHAdeMO station with 35-40 percent state-of-charge on the battery and the average time they stay is around 16-17 minutes. A half hour is fine at a fast charger, since the battery will get to 80 percent full within that time, but we're less impressed with the one-hour limit at a Level 2 station, since that will only put maybe 20 miles into the battery. The EZ-Charge card is compatible with four of "the leading EV charging networks," which here means ChargePoint, Blink, AeroVironment and NRG eVgo. Nissan says the 25 markets make up over 80 percent of all the US Leaf sales. Anyone who buys a new Leaf in one of the specified markets - or bought one on or after April 1 of this year - will get the free-to-use EZ-Charge card (others can still get the card, which means only carrying one charger company fob instead of four). The promotion starts July 1 in 10 markets (San Francisco, Sacramento, San Diego, Seattle, Portland, Nashville, Phoenix, Dallas-Fort Worth, Houston and Washington, DC) and then expands to the next 15 by the end of June, 2015. Nissan would not specify which markets these will be, but they will be where the Leaf is selling well and there are DC fast chargers. That means, we suspect, places like Chicago, St. Louis, Philadelphia and Atlanta.