Electric-car drivers going solar powered

Owners of electric vehicles have already gone petrol-free. Now, a growing number are powering their cars with sunlight.

Solar panels installed on the roof of a home or garage can easily generate enough electricity to power an electric or plug-in gas-electric hybrid vehicle. The panels aren't cheap, and neither are the cars. A Ford Fusion Energi plug-in sedan, for example, is $7,200 more than an equivalent gas-powered Fusion even after a $4,007 federal tax credit.

But advocates say the investment pays off over time and is worth it for the thrill of fossil fuel-free driving.

"We think it was one of the best things in the world to do," says Kevin Tofel, who bought a Chevrolet Volt in 2012 to soak up the excess power from his home solar-energy system. "We will never go back to an all-gas car."

No one knows exactly how many electric cars are being powered by solar energy, but the number of electric and plug-in hybrid cars in the U.S. is growing. Last year, 97,563 were sold in the U.S., according to Ward's AutoInfoBank, up 83 percent from the year before. Meanwhile, solar installations grew 21 percent in the second quarter of this year, and more than 500,000 homes and businesses now have them, according to the Solar Energy Industries Association.

Tofel, 45, a senior writer for the technology website Gigaom, installed 41 solar panels on the roof of his Telford, Pennsylvania, home in 2011. The solar array — the term for a group of panels — cost $51,865, but after state and federal tax credits, the total cost was $29,205.

In the first year, Tofel found that the panels provided 13.8 megawatt hours of electricity, but his family was using only 7.59 megawatt hours. So in 2012, Tofel traded in an Acura RDX for a Volt plug-in hybrid that could be charged using some of that excess solar energy. In a typical year, with 15,243 miles of driving, the Volt used 5.074 megawatt hours.

Tofel used to spend $250 per month on gas for the Acura; now, he spends just $50, for the times when the Volt isn't near a charging station and he has to fill its backup gas engine. Charging the Volt overnight costs him $1.50, but the family makes that money back during the day when it sends solar power to the electric grid. He estimates that adding the car will cut his break-even point on the solar investment from 11.7 years to six years.

Powering a car with solar energy isn't for everyone. Among things to consider:

SITE

A south- or southeast-facing roof is a necessity, and there can't be shady trees around the house. Sam Avery, who installs solar panels in Kentucky through his company, Avery and Sun, says dormers, chimneys and other design features can hamper an installation.

"If people do have a good site, it's usually by chance," he says. "I have to retrofit a lot."

COST

The cost of installing solar panels has come down, from $8 to $10 per watt eight years ago to $3 a watt or less now. But it's still a huge investment.

Bill Webster, 39, a graphic designer at a nonprofit in Washington, D.C., paid $36,740 for his solar array in Frederick, Maryland, three years ago, or around $3.60 per watt. Tax credits reduced his net cost to around $20,000.

Before the installation, his family was paying $1,500 per year for electricity. Now, he pays $5.36 per month, the administrative fee for connecting to the grid. That fuels his home and his all-electric Nissan Leaf, which uses around a third of the energy that his solar panels generate. Webster thinks he'll break even on his investment in six years.

Some solar companies offer leasing programs, which let customers pay a fixed monthly cost for panels. There are also some incentive programs; Honda Motor Co. offers $400 toward the installation of panels through SolarCity, a company that installs them in 15 states.

Buyers also could consider a smaller system just to power a car. A Leaf needs around 4.5 megawatt hours of electricity per year to go 15,000 miles. Eighteen 250-watt panels — a $13,500 investment at $3 per watt — would produce that much electricity.

THE CAR

For Webster, who has a predictable roundtrip commute of less than 50 miles and lives near a lot of electric charging stations, an all-electric car like the Leaf makes sense. But for Avery, who lives in rural Kentucky, the Volt was the better choice because he needs the security of a backup gas engine.

The U.S. Environmental Protection Agency's fuel-economy website — www.fueleconomy.gov — lists the number of kilowatt hours that a car uses to travel 100 miles, which can help potential buyers calculate their energy needs.

In short, people considering powering a car with solar energy have some math to do. Or maybe they don't. For Avery, the environmental benefit outweighs everything.

"The reason to go solar is not to save money," he says. "The real reason to go solar is that we have to do it."

Electric-car drivers going solar powered

Owners of electric vehicles have already gone petrol-free. Now, a growing number are powering their cars with sunlight.

Solar panels installed on the roof of a home or garage can easily generate enough electricity to power an electric or plug-in gas-electric hybrid vehicle. The panels aren't cheap, and neither are the cars. A Ford Fusion Energi plug-in sedan, for example, is $7,200 more than an equivalent gas-powered Fusion even after a $4,007 federal tax credit.

But advocates say the investment pays off over time and is worth it for the thrill of fossil fuel-free driving.

"We think it was one of the best things in the world to do," says Kevin Tofel, who bought a Chevrolet Volt in 2012 to soak up the excess power from his home solar-energy system. "We will never go back to an all-gas car."

No one knows exactly how many electric cars are being powered by solar energy, but the number of electric and plug-in hybrid cars in the U.S. is growing. Last year, 97,563 were sold in the U.S., according to Ward's AutoInfoBank, up 83 percent from the year before. Meanwhile, solar installations grew 21 percent in the second quarter of this year, and more than 500,000 homes and businesses now have them, according to the Solar Energy Industries Association.

Tofel, 45, a senior writer for the technology website Gigaom, installed 41 solar panels on the roof of his Telford, Pennsylvania, home in 2011. The solar array — the term for a group of panels — cost $51,865, but after state and federal tax credits, the total cost was $29,205.

In the first year, Tofel found that the panels provided 13.8 megawatt hours of electricity, but his family was using only 7.59 megawatt hours. So in 2012, Tofel traded in an Acura RDX for a Volt plug-in hybrid that could be charged using some of that excess solar energy. In a typical year, with 15,243 miles of driving, the Volt used 5.074 megawatt hours.

Tofel used to spend $250 per month on gas for the Acura; now, he spends just $50, for the times when the Volt isn't near a charging station and he has to fill its backup gas engine. Charging the Volt overnight costs him $1.50, but the family makes that money back during the day when it sends solar power to the electric grid. He estimates that adding the car will cut his break-even point on the solar investment from 11.7 years to six years.

Powering a car with solar energy isn't for everyone. Among things to consider:

SITE

A south- or southeast-facing roof is a necessity, and there can't be shady trees around the house. Sam Avery, who installs solar panels in Kentucky through his company, Avery and Sun, says dormers, chimneys and other design features can hamper an installation.

"If people do have a good site, it's usually by chance," he says. "I have to retrofit a lot."

COST

The cost of installing solar panels has come down, from $8 to $10 per watt eight years ago to $3 a watt or less now. But it's still a huge investment.

Bill Webster, 39, a graphic designer at a nonprofit in Washington, D.C., paid $36,740 for his solar array in Frederick, Maryland, three years ago, or around $3.60 per watt. Tax credits reduced his net cost to around $20,000.

Before the installation, his family was paying $1,500 per year for electricity. Now, he pays $5.36 per month, the administrative fee for connecting to the grid. That fuels his home and his all-electric Nissan Leaf, which uses around a third of the energy that his solar panels generate. Webster thinks he'll break even on his investment in six years.

Some solar companies offer leasing programs, which let customers pay a fixed monthly cost for panels. There are also some incentive programs; Honda Motor Co. offers $400 toward the installation of panels through SolarCity, a company that installs them in 15 states.

Buyers also could consider a smaller system just to power a car. A Leaf needs around 4.5 megawatt hours of electricity per year to go 15,000 miles. Eighteen 250-watt panels — a $13,500 investment at $3 per watt — would produce that much electricity.

THE CAR

For Webster, who has a predictable roundtrip commute of less than 50 miles and lives near a lot of electric charging stations, an all-electric car like the Leaf makes sense. But for Avery, who lives in rural Kentucky, the Volt was the better choice because he needs the security of a backup gas engine.

The U.S. Environmental Protection Agency's fuel-economy website — www.fueleconomy.gov — lists the number of kilowatt hours that a car uses to travel 100 miles, which can help potential buyers calculate their energy needs.

In short, people considering powering a car with solar energy have some math to do. Or maybe they don't. For Avery, the environmental benefit outweighs everything.

"The reason to go solar is not to save money," he says. "The real reason to go solar is that we have to do it."

Electric-car drivers going solar powered

Owners of electric vehicles have already gone petrol-free. Now, a growing number are powering their cars with sunlight.

Solar panels installed on the roof of a home or garage can easily generate enough electricity to power an electric or plug-in gas-electric hybrid vehicle. The panels aren't cheap, and neither are the cars. A Ford Fusion Energi plug-in sedan, for example, is $7,200 more than an equivalent gas-powered Fusion even after a $4,007 federal tax credit.

But advocates say the investment pays off over time and is worth it for the thrill of fossil fuel-free driving.

"We think it was one of the best things in the world to do," says Kevin Tofel, who bought a Chevrolet Volt in 2012 to soak up the excess power from his home solar-energy system. "We will never go back to an all-gas car."

No one knows exactly how many electric cars are being powered by solar energy, but the number of electric and plug-in hybrid cars in the U.S. is growing. Last year, 97,563 were sold in the U.S., according to Ward's AutoInfoBank, up 83 percent from the year before. Meanwhile, solar installations grew 21 percent in the second quarter of this year, and more than 500,000 homes and businesses now have them, according to the Solar Energy Industries Association.

Tofel, 45, a senior writer for the technology website Gigaom, installed 41 solar panels on the roof of his Telford, Pennsylvania, home in 2011. The solar array — the term for a group of panels — cost $51,865, but after state and federal tax credits, the total cost was $29,205.

In the first year, Tofel found that the panels provided 13.8 megawatt hours of electricity, but his family was using only 7.59 megawatt hours. So in 2012, Tofel traded in an Acura RDX for a Volt plug-in hybrid that could be charged using some of that excess solar energy. In a typical year, with 15,243 miles of driving, the Volt used 5.074 megawatt hours.

Tofel used to spend $250 per month on gas for the Acura; now, he spends just $50, for the times when the Volt isn't near a charging station and he has to fill its backup gas engine. Charging the Volt overnight costs him $1.50, but the family makes that money back during the day when it sends solar power to the electric grid. He estimates that adding the car will cut his break-even point on the solar investment from 11.7 years to six years.

Powering a car with solar energy isn't for everyone. Among things to consider:

SITE

A south- or southeast-facing roof is a necessity, and there can't be shady trees around the house. Sam Avery, who installs solar panels in Kentucky through his company, Avery and Sun, says dormers, chimneys and other design features can hamper an installation.

"If people do have a good site, it's usually by chance," he says. "I have to retrofit a lot."

COST

The cost of installing solar panels has come down, from $8 to $10 per watt eight years ago to $3 a watt or less now. But it's still a huge investment.

Bill Webster, 39, a graphic designer at a nonprofit in Washington, D.C., paid $36,740 for his solar array in Frederick, Maryland, three years ago, or around $3.60 per watt. Tax credits reduced his net cost to around $20,000.

Before the installation, his family was paying $1,500 per year for electricity. Now, he pays $5.36 per month, the administrative fee for connecting to the grid. That fuels his home and his all-electric Nissan Leaf, which uses around a third of the energy that his solar panels generate. Webster thinks he'll break even on his investment in six years.

Some solar companies offer leasing programs, which let customers pay a fixed monthly cost for panels. There are also some incentive programs; Honda Motor Co. offers $400 toward the installation of panels through SolarCity, a company that installs them in 15 states.

Buyers also could consider a smaller system just to power a car. A Leaf needs around 4.5 megawatt hours of electricity per year to go 15,000 miles. Eighteen 250-watt panels — a $13,500 investment at $3 per watt — would produce that much electricity.

THE CAR

For Webster, who has a predictable roundtrip commute of less than 50 miles and lives near a lot of electric charging stations, an all-electric car like the Leaf makes sense. But for Avery, who lives in rural Kentucky, the Volt was the better choice because he needs the security of a backup gas engine.

The U.S. Environmental Protection Agency's fuel-economy website — www.fueleconomy.gov — lists the number of kilowatt hours that a car uses to travel 100 miles, which can help potential buyers calculate their energy needs.

In short, people considering powering a car with solar energy have some math to do. Or maybe they don't. For Avery, the environmental benefit outweighs everything.

"The reason to go solar is not to save money," he says. "The real reason to go solar is that we have to do it."

Electric-car drivers going solar powered

Owners of electric vehicles have already gone petrol-free. Now, a growing number are powering their cars with sunlight.

Solar panels installed on the roof of a home or garage can easily generate enough electricity to power an electric or plug-in gas-electric hybrid vehicle. The panels aren't cheap, and neither are the cars. A Ford Fusion Energi plug-in sedan, for example, is $7,200 more than an equivalent gas-powered Fusion even after a $4,007 federal tax credit.

But advocates say the investment pays off over time and is worth it for the thrill of fossil fuel-free driving.

"We think it was one of the best things in the world to do," says Kevin Tofel, who bought a Chevrolet Volt in 2012 to soak up the excess power from his home solar-energy system. "We will never go back to an all-gas car."

No one knows exactly how many electric cars are being powered by solar energy, but the number of electric and plug-in hybrid cars in the U.S. is growing. Last year, 97,563 were sold in the U.S., according to Ward's AutoInfoBank, up 83 percent from the year before. Meanwhile, solar installations grew 21 percent in the second quarter of this year, and more than 500,000 homes and businesses now have them, according to the Solar Energy Industries Association.

Tofel, 45, a senior writer for the technology website Gigaom, installed 41 solar panels on the roof of his Telford, Pennsylvania, home in 2011. The solar array — the term for a group of panels — cost $51,865, but after state and federal tax credits, the total cost was $29,205.

In the first year, Tofel found that the panels provided 13.8 megawatt hours of electricity, but his family was using only 7.59 megawatt hours. So in 2012, Tofel traded in an Acura RDX for a Volt plug-in hybrid that could be charged using some of that excess solar energy. In a typical year, with 15,243 miles of driving, the Volt used 5.074 megawatt hours.

Tofel used to spend $250 per month on gas for the Acura; now, he spends just $50, for the times when the Volt isn't near a charging station and he has to fill its backup gas engine. Charging the Volt overnight costs him $1.50, but the family makes that money back during the day when it sends solar power to the electric grid. He estimates that adding the car will cut his break-even point on the solar investment from 11.7 years to six years.

Powering a car with solar energy isn't for everyone. Among things to consider:

SITE

A south- or southeast-facing roof is a necessity, and there can't be shady trees around the house. Sam Avery, who installs solar panels in Kentucky through his company, Avery and Sun, says dormers, chimneys and other design features can hamper an installation.

"If people do have a good site, it's usually by chance," he says. "I have to retrofit a lot."

COST

The cost of installing solar panels has come down, from $8 to $10 per watt eight years ago to $3 a watt or less now. But it's still a huge investment.

Bill Webster, 39, a graphic designer at a nonprofit in Washington, D.C., paid $36,740 for his solar array in Frederick, Maryland, three years ago, or around $3.60 per watt. Tax credits reduced his net cost to around $20,000.

Before the installation, his family was paying $1,500 per year for electricity. Now, he pays $5.36 per month, the administrative fee for connecting to the grid. That fuels his home and his all-electric Nissan Leaf, which uses around a third of the energy that his solar panels generate. Webster thinks he'll break even on his investment in six years.

Some solar companies offer leasing programs, which let customers pay a fixed monthly cost for panels. There are also some incentive programs; Honda Motor Co. offers $400 toward the installation of panels through SolarCity, a company that installs them in 15 states.

Buyers also could consider a smaller system just to power a car. A Leaf needs around 4.5 megawatt hours of electricity per year to go 15,000 miles. Eighteen 250-watt panels — a $13,500 investment at $3 per watt — would produce that much electricity.

THE CAR

For Webster, who has a predictable roundtrip commute of less than 50 miles and lives near a lot of electric charging stations, an all-electric car like the Leaf makes sense. But for Avery, who lives in rural Kentucky, the Volt was the better choice because he needs the security of a backup gas engine.

The U.S. Environmental Protection Agency's fuel-economy website — www.fueleconomy.gov — lists the number of kilowatt hours that a car uses to travel 100 miles, which can help potential buyers calculate their energy needs.

In short, people considering powering a car with solar energy have some math to do. Or maybe they don't. For Avery, the environmental benefit outweighs everything.

"The reason to go solar is not to save money," he says. "The real reason to go solar is that we have to do it."

Next-Generation Chevrolet Volt Features All-New Voltec Powertrain

When the next-generation Chevrolet Volt debuts at the North American International Auto Show in January, it will feature an all-new Voltec extended range electric vehicle (EREV) propulsion system substantially developed from Volt owners including data collected on their driving behaviors.

The Voltec system includes the battery, drive unit, range-extending engine and power electronics. The new system will be more efficient and offer greater EV range and fuel economy compared to the current generation.

"Our Volt owners truly love the EV driving experience, with more than 80 percent of all trips being completed without using any gasoline. We've used their real-world experiences to define the next generation Chevrolet Volt," said Alan Batey, head of global Chevrolet. "By putting our Volt owners at the center of what we do and leveraging our electrification engineering leadership, we've been able to raise the bar and will exceed their expectations with the new Volt."

Enhanced Battery System Capability

General Motors' industry-leading battery technology has been improved for the next-generation Volt. Revised cell chemistry, developed in conjunction with LG Chem, increases storage capacity by 20 percent on a volume basis when compared to the original cell, while the number of cells decreases from 288 to 192. The cells are positioned lower in the pack for improved (lower) center of gravity and the overall mass of the pack has decreased by almost 30 pounds (13 kg).

Approximately 20 million battery cells have been produced for the more than 69,000 Chevrolet Volts on the road today with industry-leading quality levels of less than two problems per million cells produced.

The battery system continues to use the Volt's industry-leading active thermal control system that maintains electric range over the Volt's life.

"The current generation Volt's battery has proven to provide our owners exceptional performance when it comes to quality and reliability," said Larry Nitz, executive director of GM Powertrain's electrification engineering team.

Based on a GM study of more than 300 model year 2011 and 2012 Volts in service in California for more than 30 months, many owners are exceeding the EPA-rated label of 35 miles of EV range per full charge, with about 15 percent surpassing 40 miles of range. Current generation Volt owners have accumulated more than 600 million EV miles.

"It would have been simple for us to tweak our existing battery to provide nominally increased range, but that's not what our customers want," said Nitz. "So our team created a new battery system that will exceed the performance expectations of most of our owners."

EV range estimates will be revealed in January at the North American International Auto Show in Detroit.

GM will manufacture the Volt battery pack at its battery assembly plant in Brownstown, Mich.

Drive Unit Focused On Improved Efficiency

Like the battery system, the next-generation Volt's drive unit was reengineered with a focus on increased efficiency and performance, improved packaging and reduced noise and vibration characteristics. The two-motor drive unit operates approximately 5 to 12 percent more efficiently and weighs 100 pounds (45 kg) less than the current system.

The Traction Power Inverter Module, which manages power flow between the battery and the electric drive motors, has been directly built into the drive unit to reduce mass, size and build complexity while further improving efficiency.

The boost in performance comes from both motors operating together in more driving scenarios, in both EV and extended-range operation. The ability to use both motors helps deliver more than 20 percent improvement in electric acceleration. GM engineers designed the Voltec electric motors to use significantly less rare earth materials. One motor uses no rare earth-type magnets at all.

The new drive unit will be manufactured at GM's Powertrain plant in Warren, Mich.

New 1.5L Range Extender

Energy for extended-range operation comes from an all-new, high-efficiency 1.5L 4-cylinder engine. The engine features a direct injection fuel system, high-compression ratio of 12.5:1, cooled exhaust gas recirculation and a variable displacement oil pump. The Voltec range extender runs on regular unleaded fuel.

"Using the 1.5L engine as the range extender assures owners they can go anywhere, anytime without having to worry about whether they have enough power to go through the Rocky Mountains or on a spontaneous weekend getaway," Nitz said. "It's all about keeping the promise that the Volt is a no-compromise electric vehicle."

The 1.5L engine will be manufactured at GM's Toluca, Mexico engine plant for the first year of production, then shift to the Flint, Mich. engine plant.