October 24, 2012

News & Features

Supercharger makes Tesla road trips possible

New York Times News Service

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Drivers can "fill up" quickly at Tesla Supercharger stations. (Bradley Berman / The New York Times)

I recently drove the Model S, a full-size sedan just introduced by Tesla, the California electric-car startup, from Lake Tahoe to Los Angeles. I covered 531 miles and the drive took 11.5 hours, during which the car consumed zero gasoline and produced no tailpipe emissions.

My route, the first a Model S owner might take using Tesla Motors' network of Superchargers, previewed a significant advance in the practicality of battery-electric cars. Tesla's string of strategically placed high-speed chargers made possible something that has not been available to American EV drivers: the ability to make a long-distance drive in a single day.

The Supercharger, Tesla's name for a proposed nationwide network of electric-car filling stations, outlines the most tangible blueprint so far of petroleum-free driving in the U.S.

"The one big holdout with most EVs today is that you can't take a road trip," says JB Straubel, Tesla's chief technical officer. "What happens if I want to go across the country? I can't tell you how many times we get that question."

Tesla's answer is to install powerful charging stations — pumping electricity at 90 kilowatts, adding about 250 miles of range in an hour — at key locations between major cities. Before the end of October, the company plans to open its first charging locations to customers who have bought the Model S. Owners with the 85-kilowatt-hour battery, which comes equipped to use the Supercharger system (the fast-charge capability is optional on the 60 kilowatt-hour model) will receive free electric fuel for life at the stations.

My journey began at 6:55 a.m. at Kings Beach, Calif., on Lake Tahoe's north shore. The 85-kilowatt-hour battery pack, which has an EPA-rated range of 265 miles, was only three-quarters full when I left, but the Model S had no trouble with the 100 miles, much of it downhill, to the first charger in Folsom, Calif. When I arrived, the battery pack still held 40 percent of its capacity.

At 9:25 a.m. in Folsom, I pulled the Model S close to the pedestal that carries the charging cable, which is only 4 feet long to ensure that it never falls to the ground and gets run over. The Supercharger itself, about the size and shape of a small refrigerator, sits 30 feet away. Plugging in was as easy as charging at home and simpler than using a gas pump.

Twenty-two minutes after plugging in, the charger had restored 100 miles of range in the Model S. It took another 20 minutes to add the next 50 miles because the rate of charging tapers down as the battery fills. Think of it as electrons having more difficulty squeezing into an increasingly crowded space.

Another five minutes of charging brought the estimated range to 254 miles, enough to make it to the next stop, Coalinga.

The Supercharger is clever in its construction. It starts with the same 10-kilowatt charger that is onboard every Model S. To build the Supercharger, the company strings together 12 of the same units, which were designed from the beginning as building blocks.
Each Supercharger can serve two cars, and most locations will have three units. With solar panels planned for many locations, operating costs are expected to remain low, perhaps explaining the free recharges.

My lunch stop at Harris Ranch, a haciendalike restaurant, added 153 miles of range before my burger even arrived. With way more energy than I would need to reach the next station 115 miles away, I made up time by flying along with Interstate 5's speedy traffic.
At 4:30 p.m., at the Lebec station — the first Tesla station to incorporate solar panels — I was content to add 117 miles of range in 25 minutes. I escaped the 104-degree day by ducking into the adjacent Yogurtland; the heat had no effect on the Model S' liquid-cooled battery pack and its ability to take the charge, according to Tesla.

The final run to Tesla's Southern California design center in Hawthorne was uneventful. I arrived at 6:30 p.m., almost 12 hours after leaving Tahoe. The Supercharger concept worked.

Driving a gas-powered car averaging 60 mph, stopping one hour for lunch and twice for 15-minute rest stops, would have cut my travel time by one hour. In my electric test car, if I had eaten my lunch on the go, the duration would have been much the same.

The transition from a day on the open road to an evening in Los Angeles, where a ceremony to introduce the Supercharger concept to a crowd of Tesla fans, was jarring.
After delivering a stilted, ad-libbed speech, Elon Musk, Tesla's chief executive, dropped the curtain from a glowing 40-foot object, apparently a charging location roadside sign, but unmistakably phallic in shape. I didn't see anything like it on my trip.

Let's hope that the cheap theatrics will fade, to be replaced by a more realistic image: thousands of EV owners on electric road trips, traversing Interstate highways, eating at highway fast-food restaurants and experiencing the open road like other Americans.

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