SolarPowerNerd
Most people know the basics of solar energy cars, but several benefits and drawbacks still fly under the radar. Below are the 10 points that come up most often, followed by five disadvantages worth knowing.
Benefits of Solar Energy Cars
1. No Emission of Gases to the Atmosphere
Solar-powered cars operate by converting sunlight into electrical energy using photovoltaic cells. These cars burn no fuel, and they do not produce emissions.
These features made many motorists fall in love with solar vehicles, especially those who want transportation that does not contribute to air pollution.
Solar power is pollution-free, and it does not release fossil gases into the atmosphere. The only time solar energy can lead to pollution is during manufacturing and transportation of the panels, but the level of pollution at that stage is relatively small.
2. Preservation of Natural Resources
Even if the solar panels and other components consume energy and resources during manufacturing, solar-powered cars require no ongoing fuel input.
Solar-powered cars do not need any kind of fuel or oil changes, so their dependence on petroleum products is small. Most parts, such as the electric motor and other components, are mostly maintenance-free compared to the engines of gas-powered vehicles.
By using solar-powered cars, you save on natural resources by a significant percentage. The same principle applies to home solar storage systems that reduce reliance on grid electricity.
3. There Are No Fuel Costs
The energy from the sun is unlimited and free, but getting solar panels is relatively expensive. However, as the technology evolves, the prices of solar panels are declining and will eventually become very affordable.
Another important thing about solar panels is that their lifespan is approximately 30 years, which is longer than most cars last. Solar-powered cars are free from the fuel costs that come with gas and diesel.
The unique feature of these cars is that they use solar energy to operate. Once installed, there is no need for other costs such as fuel and engine oils.
The energy harnessed from sunshine has no direct costs, and since the sun is a natural resource, it provides power for free. If you’re tired of spending a lot of money on fuel, a solar-powered car eliminates that expense entirely.
4. Comfortable While Driving
Solar-powered cars are powered by electric motors, which are relatively smaller than a gas engine and typically operate without causing noise or vibrations.
These cars tend to be light, which allows for faster turning and stopping. This is the main reason most solar-powered cars are used for racing and student projects.
They also achieve high speeds because they’re made light, very low to the ground, and built with a broad base.
5. Modest Available Power
When the bright sunshine falls on the earth’s surface, it usually amounts to around 1,000 watts per square meter.
Now when you convert that power into useful electricity, it only amounts to around 20% efficiency hence reducing the amount of energy that is available to about 200 watts per meter squared.
Even if you can mount the solar panel on a car that is just some square meters in size and therefore results in only 2 kilowatts at most.
Most of the motors available in electric cars usually are rated at about 100Kw or even 50 times more than that of the solar panel, which can provide on its own.
Now the solution to this is that you will need a smaller motor, a battery to store the solar energy over several days, and a plugin option to help with the connection to the car power outlet.
6. The Renewable, Clean Energy Source
Since solar energy is a renewable source, the sunlight you use today will still be there tomorrow. The sun will continue to shine for billions of years to come.
During manufacturing, the manufacturer uses some hazardous materials, but the finished product does not generate any gases or emissions. When you compare solar-powered cars to traditional vehicles, the difference in atmospheric impact is striking.
Fossil fuels used by traditional cars are limited in supply, and burning them produces carbon dioxide and other harmful emissions. Solar cars do not burn fossil fuels while driving, keeping the environment cleaner.
The same renewable approach powers rooftop solar systems for homes.
7. There Are No Energy Costs
Every other vehicle technology, whether gasoline, diesel, or electric, comes with energy costs. An electric car requires the owner to spend a few dollars charging its battery from a power outlet.
Gas-powered cars need regular purchases of fossil fuels and biofuels.
Solar-powered cars use solar energy directly from sunlight, and there are no direct costs tied to that energy. The sun is a natural resource that provides power every day whether you use it or not.
8. The Solar-Powered Cars Are Barebones
Since most solar-powered cars are developed for competition, they’re generally designed for very low wind resistance. These cars are made flat and low to the ground, without the accessories drivers take for granted, such as headlights, wipers, and rear mirrors.
Their bodies are covered with photovoltaic cells to optimize the amount of solar energy collected. However, reaching highway speeds is difficult because their motors are typically rated at just 7 kilowatts, or about 9.4 horsepower.
These cars prove that solar power works under ideal conditions, but most of the work remains with automakers to offer a practical solar-powered car for everyday use.
9. Development of Technology
Solar energy has driven significant growth in technology since it first became practical. The innovation of solar-powered cars helped many people realize how solar vehicles compare favorably to traditional gas-powered cars.
When you compare earlier technology to what exists today, the progress is clear. Many observers look forward to the day when solar-powered cars are used for public and private transport, not just racing events.
10. Low Maintenance Costs
Solar energy systems do not require a lot of maintenance. The main task is keeping them clean, which means cleaning them several times per year.
A specialized cleaning company can handle this for around $25 to $35 per visit.
Manufacturers usually offer between 20 and 25 years of warranty because solar panels have no moving parts and minimal wear and tear. The only component that may need replacing is the inverter, typically after 5 to 10 years of continuous use.
Cables also need occasional checks to keep the system running at peak efficiency. Once you cover the initial purchase and installation costs, you can expect very few dollars spent on repair and maintenance.
Disadvantages of Solar Energy
No technology is perfect, and solar-powered cars have real drawbacks worth considering.
1. High Initial Costs
The initial costs of purchasing solar systems are relatively high. Before you set up a system, you will need solar panels, an inverter, batteries, and wiring for installation.
Purchasing all these materials requires a significant amount of money, which is a barrier for many people. However, as technology improves, prices continue to drop.
2. Weather Dependent
Even if solar energy can still be collected during rainy and cloudy seasons, the efficiency of the solar system also drops.
We can now comfortably say that solar energy is directly dependent on the weather condition, and therefore, when there is good weather, the amount of solar energy to be collected is high that the vice versa is true.
Usually, the solar panels highly depend on sunlight to effectively collect solar energy efficiently.
Therefore, this means that there is no way you can collect solar energy during the night because there will be no sunlight.
3. Storing Solar Energy is Relatively Expensive
Since solar energy cannot be collected at night, it has to be stored in batteries. These batteries charge during the day so they can supply power when the sun is not available.
This is the best current solution for around-the-clock solar energy, even though the batteries add expense to the overall system.
4. The Solar Panel Uses a Lot of Space
If you want to generate a lot of power from the sunlight, then it means that you will need to have more solar panels to collect as much sunlight as possible.
The solar PV panels require much space, and therefore, the top roof could not be big enough to fit the number of panels needed.
Now, if you do not have that enough space that is required to fit the high number of panels, then you will opt for fewer panels.
5. Causes Pollution During the Manufacture of Solar Panels
Manufacturing solar panels involves hazardous materials that contribute to pollution. The transportation and installation of solar systems also produce some emissions.
However, compared to the ongoing pollution from fuel-powered cars, solar energy pollutes far less. Even small solar products like camping lanterns carry a much lower environmental footprint than their battery-powered alternatives.
History of the First Solar Racing Challenge
Inventors are working to minimize the problems associated with solar-powered cars. Their focus is on battery systems that offer high-density energy to power the car during bad weather and at night.
They are also researching more efficient solar panel designs for vehicles.
The World Solar Challenge is a famous race held every 2 to 3 years from Darwin to Adelaide in Australia. The route covers about 3,006 km through areas with abundant sunshine.
Vivianne and Stewart Lister designed and built a solar-powered car and entered it in the 1993 race. They constructed an extensive solar panel across the top of their car and made it adjustable so it could tilt to face the sun throughout the day.
Along the way, their car became unstable at high speeds, and their average speed dropped to 50 km/h. At one point, a strong wind lifted the car about 10 meters high and dropped it into rocks and trees roughly 100 meters off the road.
Other problems included extreme cockpit heat and batteries that could not store enough energy for cloudy weather. The batteries were also very large and took up a lot of space.
Despite these challenges, Vivianne and Stewart finished first in their class. Since the World Solar Challenge began in 1987, when the winning average speed was about 67 km/h, progress has been steady.
By 2007, the winner averaged about 91 km/h, and companies like Toyota continue to invest in more efficient cells and lighter batteries.
Frequently Asked Questions
How fast can solar-powered cars go?
Most purpose-built solar race cars cruise at average highway speeds, though their motors are often rated at just 7 kilowatts. In the World Solar Challenge, winning speeds have climbed from about 67 km/h in 1987 to roughly 91 km/h by 2007.
Everyday solar-assisted prototypes are slower because they carry more weight and safety equipment. As battery and cell technology improves, these speeds will likely increase.
Can you drive a solar car at night or in bad weather?
Solar cars rely on stored battery power when direct sunlight is not available. During cloudy weather, photovoltaic cells still generate some electricity, but at reduced efficiency.
Most designs include a plug-in charging option as a backup for extended periods without sun. Planning trips around weather forecasts helps drivers get the most range from their vehicles.
How long do solar panels on a car last?
Solar panels generally carry warranties of 20 to 25 years, which is longer than the typical lifespan of a car. Because there are no moving parts, wear and tear on the panels themselves is minimal.
The inverter may need replacing after 5 to 10 years, and wiring should be inspected periodically. Maintenance demands are far lower than for a conventional engine.
Are solar-powered cars practical for daily commuting?
Current solar-powered cars are mostly built for racing and research, not everyday use. The limited surface area on a car roof cannot generate enough power for all driving needs on its own.
However, solar-assisted hybrids that supplement battery charging with rooftop panels are getting closer to market. As panel efficiency and battery density improve, practical daily-driver models become more realistic.
Final Thoughts
Solar-powered cars offer genuine benefits, from zero tailpipe emissions and no fuel costs to low maintenance and renewable energy use. The technology has come a long way since the first World Solar Challenge in 1987, and major automakers are investing in more efficient cells and lighter batteries.
The drawbacks are real too, including high upfront costs, weather dependence, expensive storage, and limited panel space on a vehicle. Still, the trajectory points toward steady improvement.
As prices drop and efficiency rises, solar-powered cars will move closer to being a practical option for everyday drivers.
