PV to EV: Solar Panels Powering your Electric Vehicle
Guest author: Laurel Hamilton, Elemental Energy
Solar power systems and electric cars go together like PB&J. Pair the two and you can both power that hot tub you’ve been feeling guilty about AND your daily trips around town with completely clean energy from the sun!
Installing solar panels on your roof to power your electric vehicle (EV) is not only a great investment, it’s a step toward a healthier future. As the Bend population swells, reducing ozone-causing emissions will be important for maintaining our clean mountain air. By driving a solar powered EV, you can eliminate emissions associated not only with your tailpipe but also with your utility’s electricity production. EVs have 99% less CO2 (carbon dioxide) and VOCs (volatile organic compounds), 70% less NOx (nitrogen oxides) and 32% less greenhouse gases (GHG) than gas vehicles. You could safely say you were doing your part to contribute toward Bend’s goal to reduce fossil fuel use by 40% by 2030 (City of Bend’s Climate Action Resolution)!
Since EVs don’t run on gasoline, the EPA rates them based on how many kilowatt-hours (kWh) it takes to drive 100 miles, which they convert to a “miles-per-gallon equivalent” (MPGe). You can compare the MPGe ratings for all EVs on the market at FuelEconomy.gov. Once you know the rating for your chosen EV, you can easily calculate how much extra electricity you’ll need to charge your car.
Here’s an example: The 2017 Nissan Leaf, an all-electric vehicle, has an MPGe rating of 30 kWh/100 miles. If you average 25 miles per day, you’re using approximately 7.5 kWh of electricity – or just over 2,700 kWh of electricity annually. This is the “extra” amount of electricity you may want to have your solar installer design into your solar system to ensure you’re driving with the power of the sun!
Now let’s talk $$$. Is it really more affordable to power an EV with solar compared to the grid? How does this stack up against a traditional gas guzzler? Going back to our estimate of an average 25 miles per day this how your fuel costs would pencil out:
| Gas Car with 25mpg ($2.70/gallon gas) | $2.70/day, $985/year |
| EV with Pacific Power grid energy (11¢/kWh) | $0.82/day, $301/year |
| EV with solar (Average solar cost of 3.5¢/kWh for 25 yr period) | $0.26/day, $96/year |
It turns out if you’re looking for an economical car, you should be considering an EV!
Factor in a solar system to fuel the car and it becomes an even better investment over the long-term. Surprising? Yes, at first glance, the sticker price may seem more expensive but if you conduct a full “cost of ownership” analysis, the gap quickly narrows. An electric car is a lot less hassle to maintain – no oil or filter changes, no tune-ups, and no replacing timing belts. Even the brakes wear out less frequently since the car uses regenerative braking to recharge the batteries.
Both the electric car and the solar system have a payback time, after which the energy generated to get you from point A to point B or to brew your coffee in the morning is completely free! Bills for grid power never end, like renting a house vs. owning. Gas-sucking cars will never stop requiring that you pay at the pump – with gas price increases certain.
Combine the $7,500 federal tax credit for an EV with a hot deal from a group buy program for electric vehicles like the one The Energy Challenge of Central Oregon is organizing through the end of June (up to an additional $10,000 dealership promotion), and you would be crazy not to opt for an electric vehicle!
For more information about solar, visit our solar page.
For more information about electric vehicles and to learn about the EV Group Buy program, visit our electric vehicle page.