With the rise of electric vehicles (EVs) and growing interest in sustainable energy solutions, combining solar panels with electric cars is an increasingly popular option for homeowners. This alternative offers environmental benefits, financial savings, and greater energy independence.
In this guide, we’ll explore the basics of solar car charging, helping you make informed decisions about how to harness solar energy to power your car.
But first, how about a little future talk?
Can electric cars with solar panels work?
The idea of charging an electric car entirely with solar energy has been in the popular imagination for years, but in practice, is it really feasible? Although there are models of electric cars that incorporate solar panels, there are currently none that rely exclusively on solar energy to power their main battery. However, advances in this technology could bring us closer to this dream.
How do solar panels work in electric cars?
In some models of electric cars, solar panels are not designed to fully power the vehicle, but are intended to supplement the charge of the secondary 12-volt battery or even generate a little extra range. Below are some examples of vehicles that incorporate solar panels:
Fisker Ocean
This electric SUV offers a more advanced version with a solar roof. Under ideal conditions, this panel can generate up to 1,500 miles of range per year, which is equivalent to about 5.5 miles (approximately 9 km) per day.
Hyundai Ioniq 5
Some versions of this model incorporate solar panels on the roof that can generate an additional 3 km of daily range.
Toyota Prius Prime
Its solar roof is capable of charging the 12-volt battery and powering systems such as air conditioning when the car is moving or parked.
Why can’t solar panels power a full electric car?
The main challenge of using solar energy to fully power an electric car is efficiency. Current solar panels convert only 22.8% of the sunlight they capture into electricity. In addition, the amount of energy needed to efficiently move an electric car is much higher than a typical solar panel can generate under ideal conditions.
To put this into perspective, it is estimated that it would take between 7-12 solar panels (like those used to power a home) to charge an electric vehicle via solar power at home, and even then, the charging time would be considerable.
Where does solar power make sense in electric cars?
While a conventional electric car cannot rely solely on solar power, there are some instances where this technology can be useful. Microcars and low-speed vehicles are a perfect example. These cars have smaller batteries and consume less energy, allowing the solar panel to add significant range.
The Squad Solar Car, for example, is a small four-wheeled car designed to operate at low speeds (ideal for urban areas). It has a solar roof that provides up to 30 km of daily range, making it a viable option for short trips.
Which electric cars are closest to solar propulsion?
While there are no fully solar cars on the market today, some brands are making progress in this field. For example:
Aptera
This three-wheeled electric car, developed by a startup of the same name, is designed to be powered primarily by solar energy. Although it is a smaller and lighter model, its solar roof has the capacity to generate up to 65 km of daily range, making it a promising example of what could be possible in the future.
Lightyear 0 and Lightyear Two
Lightyear is developing four-wheeled electric cars with integrated solar panels that could add 10 to 15 km of daily range, depending on light conditions. The Lightyear 0 is the first attempt to commercialize a solar car, although its high price limits its accessibility.
Will we be able to rely solely on solar energy for electric cars in the future?
Solar technology in vehicles is advancing, but we are still far from having a fully solar-powered car. However, companies like Mercedes-Benz are exploring solutions like the Vision EQXX, which has a futuristic design and a high level of energy efficiency, which could allow solar cars to become more realistic in the future.
After this science fiction journey through the future of solar panels in electric cars, let’s return to the present and continue talking about charging electric cars with solar energy.
How many panels do you need to charge an electric car with solar energy?
The number of solar panels you need to charge an electric car with solar energy will depend on factors such as:
- Kilometers traveled per day: The more kilometers you drive, the higher the energy consumption.
- EV battery capacity: Each model has a specific consumption per kilometer.
- Solar panel efficiency: It depends on their technology and local weather conditions.
On average, you may need between 5 and 12 solar panels to cover the charging needs of an EV, depending on the capacity of the photovoltaic system and the daily use of the car.
Aspects that influence the number of solar panels needed for an electric car
- Vehicle energy consumption: More efficient models will require less energy.
- Solar panel performance: Orientation, tilt, and daily sunlight hours are crucial.
- Local solar output: Locations with higher solar radiation will require fewer panels.
- Charging frequency and patterns: Charging at night or during the day influences system design.
How much does it cost to charge an electric car with solar energy?
- Cost of a full charge: Calculate the usable capacity of the battery (in kWh) and multiply it by the price of electricity. For example, if the battery has 75 kWh and the cost per kWh is €0.17, charging it will cost approximately €12.75.
- Cost per 100 kilometres: Multiply the average consumption of the car (kWh/100 km) by the cost of electricity. For example, with a consumption of 30 kWh/100 km and a cost of €0.17 per kWh, the cost would be €5.10 per 100 km.
Is solar charging cheaper?
Yes, residential solar can significantly reduce charging costs over time. Although the initial installation cost can be high, the price per kWh generated is fixed for about 25 years, providing substantial savings over grid rates.
Is a storage battery necessary?
A home battery allows you to store excess solar energy to charge your vehicle at night or on cloudy days, avoiding relying on the grid during higher cost times. This is especially useful if your provider’s rates are higher at night.
Benefits of using solar panels with electric cars
Cost savings
Generating your own electricity is cheaper than relying on the grid.
Environmental impact
You reduce carbon emissions by using a renewable energy source.
Convenience
Charge your vehicle at home without drastically increasing your electric bill.
Energy independence
Minimize your dependence on the electric grid and protect your supply during power outages.
Is installing solar panels a good idea if I plan to buy an electric car?
If you’re considering purchasing an electric car, installing solar power can maximize the environmental and economic benefits of your investment. Once the cost of the photovoltaic system is paid for, you’ll be able to charge your car at virtually no additional cost.
Next steps
If you’re interested in integrating solar power and electric vehicles, consult with an energy advisor to design a system that fits your needs. Customized proposals detail expected output, projected savings, and available financing options so you can make the leap toward sustainability.
