Why can t solar energy be used in a large area in cars?

First, although solar energy is abundant, it is relatively scattered and not easy to collect. Moreover, due to the influence of factors such as the earth's revolution, rotation, season, climate, etc., the distribution of solar energy in various places is uneven, and the intensity cannot be maintained by the influence of time, region and geographical conditions, and the solar power radiated to the ground is unstable.

Second, according to the general material application and technical capabilities, the current solar energy conversion rate can only reach about 20% at most, which is difficult to meet the sufficient power required for high-speed driving, mainly because the grid shading on the surface of monocrystalline silicon cells has a certain impact on the conversion efficiency. At the same time, the loss of irradiation to the surface of the cell is also very large, including surface light reflection loss, light conduction loss, internal recombination loss, surface recombination loss, etc.

Third, due to the high manufacturing cost of solar cars and the imperfect technology, automakers are reluctant to invest in the development of solar vehicles. Some companies develop solar cars for the sake of publicity and corporate image, rather than the determination to vigorously develop and put them into the market.

1. The current theoretical value of photoelectric conversion efficiency (IPCE) is about 33%, which is actually an important bottleneck restricting the application of solar cells. This depends on the intensity of light (affected by the atmosphere) on the one hand, and the limitations of semiconductor materials on the other, and the development of new materials will have the potential to greatly exceed this threshold. Today's commercially available solar panels, whether monocrystalline or polycrystalline, have an IPCE value of less than 20%.

2. According to the currently commercialized silicon panels, the power per square meter is less than 150 watts. Even the smallest Alto three-cylinder engine has a power of more than 25 kilowatts. In other words, if you want to power a car like Alto entirely solar, you need at least 160 square meters of panel area.

This means that the roof of the car should be equipped with a panel that is 16 meters long and 10 meters wide and tilts to the angle of the sun. This is absolutely impossible to achieve. The weight of the battery panels has already exceeded the weight of the vehicle.

Because the solar energy storage is weak and occupies a lot of space, it is not suitable for use in cars.

1. The technical problem is not very perfect, and the equipment is not very convenient.

Current solar energy conversion technology is too inefficient.

The sun's irradiation conditions vary too much, resulting in unbalanced solar energy.

At present, the cost of solar cells is too high

There are no solar cars because of technical problems, such as low conversion rate of solar cells, low energy storage batteries, and the range does not meet daily requirements. The following are the specific reasons why there are no solar cars: Affecting driving safety:

The maintenance cost of solar panels is high, which affects the safety of the whole vehicle. It's hard to avoid bumps while driving, and the cost of repairing solar panels is high. Moreover, the later maintenance is not in place, and it is easy to fall off, which affects the safety of the car.

Car Challenge: Although solar cars are not yet widely used in everyday homes for various reasons, solar cars are now being developed in many countries around the world. Among them, the "2019 Bridgestone World Solar Car Challenge", which represents the advanced level of solar vehicles, is in full swing in Australia.

promote the development of solar-powered vehicles; The event is also the world's largest and longest-running solar car challenge, having been held several times. This time, Bridgestone also provided 32 participating teams, including the Chinese team, with energy-saving green songs equipped with Ecopia-withologic tires to help young engineers realize their ambitions and contribute to the development of solar vehicle technology.

Analysis of the application and development prospects of solar vehicles.

Yan Xuebo. Unit: Jiangsu Transportation Energy Conservation and Emission Reduction Engineering Technology Research Center.

Abstract:With the continuous progress of photovoltaic cell technology and electronic technology, solar energy vehicles are a new energy vehicle.

It has come to the fore. By comparing with traditional fuel vehicles, the advantages and disadvantages of solar vehicles are analyzed.

At the same time, the current development status of solar energy vehicles is elaborated, and the factors that limit the development of solar energy are comprehensively considered.

The development prospect of solar energy vehicles is analyzed, which provides a certain reference for the development direction of solar energy vehicles in the future.

1. The working principle of solar cars.

A solar car, as the name suggests, is a car powered by solar energy, which is the biggest difference from a traditional internal combustion engine-powered car. In a sense, a solar car is also an electric vehicle, the difference is that the battery of an electric car is charged by the industrial grid, while the solar car uses solar cells, and the role of solar cells is to convert solar energy into electricity.

The power generation system is the power source of the solar car, including solar panels, solar controllers, batteries (groups) and DC motors. Among them, solar panels belong to photovoltaic equipment (the main part is semiconductor materials), which is the core part of the solar power generation system and the most expensive part of the system. It is irradiated by light and the photoelectric effect occurs to generate current, which is adjusted by the solar controller to obtain a safe and stable current and then sent to the battery for storage, or directly drives the motor to rotate to provide power for the car.

Figure 1 How a solar car works.

There are three main types of energy flow in a solar car:

1. Sunlight directly drives the car. When the sun is sufficient, the solar radiation occurs through the panels, and a part of the current generated is directly transmitted by the controller to the DC motor, driving the car forward. The remainder is stored in the battery to be charged.

2. When the sunlight is insufficient or the solar car needs more power in starting, accelerating, etc., the energy converted by the solar panel cannot meet the conditions of driving the car, and the electric energy stored in the battery is supplied to the motor at the same time to jointly drive the car forward.

3. When the car is decelerating or braking, the kinetic energy of the car itself will be transmitted to the battery by the motor in reverse to charge it, so as to realize the best braking energy. At this point, the electrical energy absorbed by the solar panels also charges the battery at the same time, preparing it for restarting.

Because of this environmental protection, the earth's resources are limited, and it is also very frugal.

Summary. Dear, solar energy cars consume solar energy.

Dear, solar energy cars consume solar energy.

The working principle of solar car: the solar panel attached to the outer surface of the car is used to directly convert solar energy into electrical energy, and then through the consumption of electric energy, the vehicle is driven, and the speed of the car can be solved as long as the current of the input motor is controlled. A solar car is a type of car that is powered by solar energy.

Compared to traditional heat-engine-powered vehicles, solar-powered vehicles are truly emission-free. Because of its eco-friendly characteristics, solar cars are advocated. Solar cars are packed with honeycomb-like devices, which are solar panels.

Solar cells are usually divided into silicon cells, cadmium sulfide batteries, gallium arsenide batteries, etc., according to the different semiconductor materials used, among which silicon solar cells are the most commonly used. In sunlight, solar photovoltaic panels collect sunlight and generate an electric current that is common to people. This energy is stored by the battery and powered for later travel.

Or it can be supplied directly to the engine, and it can also store power while it is turned on. The energy moves the wheels through the engine controller, propelling the solar car forward. And without an internal combustion engine, solar electric vehicles cannot hear the roar of the internal combustion engine of a gasoline vehicle while driving.

Solar cars are also a type of electric vehicle, except that the battery of an electric vehicle is charged by the industrial grid.

The solar car is coming, it is reported that this kind of car has begun mass production, it sounds very, the price of this car is more than 1.7 million, so, will you buy a solar car? What are the disadvantages of solar cars? Here's an introduction.

Would you buy a solar car.

Solar cars are already in production, and the two solar curved panels on the car absorb the solar energy and provide an additional 70 kilometers of range per day.

Foreign countries have a high evaluation of this car, and even Musk is a supporter of solar cars. Would you buy a solar car that can only be driven in a place where the sun is very strong?

It is reported that this multiple-eye-catching solar car is called "Light Year 0", and the designer said: if it does not travel more than 35 kilometers a day, in good enough weather, this car can run for 7 months without additional charging. This also means that the range of the vehicle also has a certain relationship with the weather.

According to reports, the solar car, named Lightyear 0, is equipped with a 5-square-meter solar panel on the top of the vehicle, which can provide a range of about 70 kilometers in sunny weather conditions. Then many people can't help but ask, how to travel in the medium and long distances with such a short range?

Don't worry, in addition to solar charging, this car can also be charged by charging piles. The new car is equipped with a built-in battery pack of more than 60 degrees, which consumes only 100 kilometers of power, and under the WLTP comprehensive working condition, its range can exceed 600 kilometers and reach 625 kilometers, which is suitable for medium and long distances.

According to overseas ** reports, "Lightyear 0" will start mass production in the fall of 2022, and will be officially launched in the European market as early as November this year. The first batch of new cars will be priced at around 250,000 euros (about 1.76 million yuan).

What are the disadvantages of solar cars?

The world's first solar-powered car is priced at 250,000 euros, equivalent to almost 1.76 million yuan. Just by looking at the ** of this car, you know that its target user is Saudi Arabia's local tyrants, but the problem is that Saudi Arabia is not short of oil, so why do you have to buy a solar-powered Zifengqiao car. I won't talk about the advantages, after all, the official data has said a lot, let's talk about a few disadvantages.

1. This kind of car is too dependent on the region, and it is afraid that it cannot be driven in the vast majority of provinces in China, especially in the rainy season in the south and the winter in the north, the car is basically closed;

2. The body is all solar panels, if there is a traffic accident, I don't know how much it will cost to repair or replace the solar panels, and the later maintenance is unknown;

3. **Too expensive, ordinary people can't afford it, I can't buy a car with this money, I have to buy a solar car.

【Pacific Automobile Network】No pollution, no noise. Because they do not use fuel, solar-powered electric vehicles do not emit harmful gases that pollute the atmosphere. The disadvantages mainly include the high cost of solar energy, the lack of mature technology, the low efficiency of solar energy, and the slow speed.

The roof of the car is equipped with a device that absorbs solar energy, which charges the two batteries, which in turn provide electricity to the engine. Using the solar panel attached to the exterior of the car, the solar energy is directly converted into electric energy, and then through the consumption of electric energy, the vehicle is driven, and the speed of the car can be solved by controlling the current input to the motor.

The weak solar radiation intensity, the high cost of photovoltaic panels, and the limitations of battery capacity and weather make the practicality of cars powered entirely by solar energy greatly limited, which is not conducive to promotion. The result is a car that is powered by a mixture of solar energy and other energy sources. Hybrid energy vehicles are similar in appearance to conventional vehicles, except that some solar energy absorbers are installed on the surface of the vehicle, such as roof panels, to charge the battery or directly as a power source.

This type of car has both a gasoline engine and an electric motor, the gasoline engine drives the front wheels, and the battery powers the electric motor to drive the rear wheels. The electric motor is used for low-speed driving. When the speed reaches a certain speed, the gasoline engine starts, the electric motor detaches from the drive shaft, and the car runs like a normal car.

Photo by Chen Jie 2).