The Lightyear 0, a solar-electric passenger car went into limited production in December 2022. Production stopped a month later.
A solar car is a solar vehicle for use on public roads or race tracks. Solar vehicles are electric vehicles that use self-contained solar cells to provide full or partial power to the vehicle via sunlight. Solar vehicles typically contain a rechargeable battery to help regulate and store the energy from the solar cells and from regenerative braking. Some solar cars can be plugged into external power sources to supplement the power of sunlight used to charge their battery.
Solar cars combine technology typically used in the aerospace, bicycle, alternative energy and automotive industries. The design of solar vehicles always emphasizes energy efficiency to make maximum use of the limited amount of energy they can receive from sunlight. Most solar cars have been built for the purpose of solar car races. However several prototypes of solar cars designed for use on public roads have been designed and built.
There are various solar car competitions around the world that are generally partaken by collegiate and company teams. The most notable competitions is the World Solar Challenge, which is an international competition that takes place in Australia. Some other competitions include the American Solar Challenge and the United Solar Challenge.
As of December 2022, only one solar car had reached production, the Lightyear 0, but at the limited delivery rate of one car a week.[1] In January 2023 the company halted vehicle manufacture and sales, and the vehicle maker's production company, Atlas Technologies B.V., requested bankruptcy protection.[2][3]
The Aptera's production is expected to start in 2024.[4]
Solar cars depend on a solar array that uses photovoltaic cells (PV cells) to convert sunlight into electricity. Unlike solar thermal energy which converts solar energy to heat, PV cells directly convert sunlight into electricity.[5] When sunlight (photons) strike PV cells, they excite electrons and allow them to flow, creating an electric current. PV cells are made of semiconductor materials such as silicon and alloys of indium, gallium and nitrogen. Crystalline silicon is the most common material used and has an efficiency rate of 15–25%.
History
The first model solar car invented was a tiny 15-inch vehicle created by General Motors employee, William G. Cobb. Designated the Sunmobile, he displayed it in 1955 at the Chicago, Powerama convention. It was made up of 12 selenium photovoltaic cells and a small electric motor.[6]
In 1962 the International Rectifier Company added a solar panel to a 1912 Baker Electric, and unveiled the first solar car that could carry passengers. [7]
Solar array
The solar array consists of hundreds of solar cells converting sunlight into electricity. In order to construct an array, PV cells are placed together to form modules which are placed together to form an array.[8] The larger arrays in use can produce over 2 kilowatts (2.6hp).
horizontal. This most common arrangement gives most overall power during most of the day in low latitudes or higher latitude summers and offers little interaction with the wind. Horizontal arrays can be integrated or be in the form of a free canopy.
vertical. This arrangement is sometimes found in free standing or integrated sails to harness wind energy.[9] Useful solar power is limited to mornings, evenings, or winters and when the vehicle is pointing in the right direction.
adjustable. Free solar arrays can often be tilted around the axis of travel in order to increase power when the sun is low and well to the side. An alternative is to tilt the whole vehicle when parked. Two-axis adjustment is only found on marine vehicles, where the aerodynamic resistance is of less importance than with road vehicles.
The Squad Solar City Car, as presented of the Fully Charged 2022 event in Amsterdam.integrated. Some vehicles cover every available surface with solar cells. Some of the cells will be at an optimal angle whereas others will be shaded.
trailer. Solar trailers are especially useful for retrofitting existing vehicles with little stability, e.g. bicycles. Some trailers also include the batteries and others also the drive motor.
remote. By mounting the solar array at a stationary location instead of the vehicle, power can be maximised and resistance minimized. The virtual grid-connection however involves more electrical losses than with true solar vehicles and the battery must be larger.
The choice of solar array geometry involves an optimization between power output, aerodynamic resistance and vehicle mass, as well as practical considerations. For example, a free horizontal canopy gives 2-3 times the surface area of a vehicle with integrated cells but offers better cooling of the cells and shading of the riders. There are also thin flexible solar arrays in development.
Solar arrays on solar cars are mounted and encapsulated very differently from stationary solar arrays. Solar arrays on solar cars are usually mounted using industrial grade double-sided adhesive tape right onto the car's body. The arrays are encapsulated using thin layers of Tedlar.
Some solar cars use gallium arsenide solar cells, with efficiencies around thirty percent. Other solar cars use silicon solar cells, with efficiencies around twenty percent.[10]
Batteries
The battery pack in a typical solar car is sufficient to allow the car to go 250 miles (400km) without sun, and allow the car to continuously travel at speeds of 60mph (97km/h).
Motors
The motors used in solar cars typically generate about 2 or 3 horsepower,[11] yet experimental light solar cars may attain the same speed as a typical family car (100mph (160km/h)).[12]
Two solar car races are the World Solar Challenge and the American Solar Challenge, overland road rally-style competitions contested by a variety of university and corporate teams.
The World Solar Challenge features a field of competitors from around the world who race to cross the Australian continent, over a distance of 3,000 kilometres (1,900mi). Speeds of the vehicles have steadily increased. For example, the high speeds of 2005 race participants led to the rules being changed for solar cars starting in the 2007 race and 2014 also.
The American Solar Challenge, previously known as the 'North American Solar Challenge' and 'Sunrayce USA', features mostly collegiate teams racing in timed intervals in the United States and Canada. This race also changed rules for the most recent race due to teams reaching the regulated speed limits. The most recent American Solar Challenge took place from Independence, Missouri to Twin Falls, Idaho from July 9 to July 16, 2022.[13]
The Dell-Winston School Solar Car Challenge is an annual solar-powered car race for high school students. The event attracts teams from around the world, but mostly from American high schools. The race was first held in 1995. Each event is the end product of a two-year education cycle launched by the Winston Solar Car Team. In odd-numbered years, the race is a road course that starts at the Dell Diamond in Round Rock, Texas; the end of the course varies from year to year. In even-numbered years, the race is a track race around the Texas Motor Speedway. Dell has sponsored the event since 2002.
Solar cells spread over the top of this car produce enough energy to keep its electric motor running
The South African Solar Challenge is a bi-annual two-week race of solar-powered cars through the length and breadth of South Africa. Teams will have to build their own cars, design their own engineering systems and race those same machines through the most demanding terrain that solar cars have ever seen. The 2008 race proved that this event can attract the interest of the public, and that it has the necessary international backing from the FIA. Late in September, all entrants will take off from Pretoria and make their way to Cape Town via the N1, then drive along the coast to Durban, before climbing the escarpment on their way back to the finish line in Pretoria 10 days later. In 2008 the event was endorsed by International Solarcar Federation (ISF), Fédération Internationale de l'Automobile (FIA), World Wildlife Fund (WWF) making it the first Solar Race to receive endorsement from these 3 organizations.
Sunswift IV and control vehicle during speed record attempts at HMAS Albatross
Guinness World Records recognize a land speed record for vehicles powered only by solar panels. This record is currently held by the Sky Ace TIGA from the Ashiya University.[14] The record of 91.332km/h (56.75mph) was set on 20 August 2014 at the Shimojishima Airport, in Miyakojima, Okinawa, Japan. The previous record was held by the University of New South Wales with the car Sunswift IV. Its 25-kilogram (55lb) battery was removed so the vehicle was powered only by its solar panels.[15] The record of 88.8km/h (55.2mph) was set on 7 January 2011 at the naval air base HMASAlbatross in Nowra, breaking the record previously held by the General Motors car Sunraycer of 78.3 kilometres per hour (48.7mph). The record takes place over a flying 500 metres (1,600ft) stretch, and is the average of two runs in opposite directions.
The first solar family car was built in 2013.[16] Researchers at Case Western Reserve University, have also developed a solar car which can recharge more quickly, due to materials used in the solar panels.[17]
Chinese solar panel manufacturer Hanergy plans to build and sell solar cars equipped with lithium-ion batteries to consumers in China.[18][19] Hanergy says that five to six hours of sunlight should allow the cars' thin-film solar cells to generate 8–10kWh of power a day, allowing the car to travel about 80km (50mi) on solar power alone.[20] Maximum range is about 350km (217mi).
In June 2019 the solar-electric Lightyear One was announced, since renamed the Lightyear 0. Designed by former engineers from Tesla and Ferrari, the car's hood and roof are composed of solar panels. The vehicle also charges on regular electric power as well as fast-charging stations.[21] In September 2021, the company Lightyear was reported to have raised enough money to bring the vehicle to limited production, at a cost of €149,000, delivering the first units in 2022.[22]
First prototype of the Aptera solar powered EV
In August 2019, Aptera Motors announced a funding campaign for a solar-powered, very efficient "Never Charge" EV, the Aptera, with up to a 1000-mile range.[23][24] That funding campaign was successful and the first Aptera prototype was shown and the EV launched on December 4, 2020.[25] As of July 2023, three generations of prototypes have been built and shown, production equipment and tooling is being acquired and fundraising continues.
In July 2020, the German car manufacturer Audi signed an MOU with an Israeli start-up Apollo-Power for development plan to incorporate the company proprietary lightweight flexible panels into Car parts. Apollo-Power's Agenda is to turn every car in the world to become Solar.
In 2019 the Squad Solar City Car by Squad Mobility was announced and in May 2022 it was finally presented in the Media. The Squad Solar City Car is the first Solar Micro Car for (sub)urban use.
A solar vehicle or solar electric vehicle is an electric vehicle powered completely or significantly by direct solar energy. Usually, photovoltaic (PV) cells contained in solar panels convert the sun's energy directly into electric energy.
In automobile engineering, electric vehicle conversion is the replacement of a car's combustion engine and connected components with an electric motor and batteries, to create a battery electric vehicle (BEV).
The Honda EV Plus was an experimental electric vehicle which was the first battery electric vehicle from a major automaker that did not use lead acid batteries. Roughly 340 EV Plus models were produced and released. Production of the EV Plus was discontinued in 1999 after Honda announced the release of its first hybrid electric vehicle, the Honda Insight.
Aptera Motors Corp. is an American crowd funded startup company based in Carlsbad, California. It was originally founded in 2005 before liquidating in 2011. The company was relaunched by the original founders in 2019.
The Stanford Solar Car Project (SSCP) is a student group at Stanford University that designs, builds, tests, and races solar-powered vehicles. The SSCP, a student-run, donation-funded organization, has been building and racing solar-powered vehicles since 1986. It has competed and placed at The World Solar Challenge, the Global Green Challenge, and American Solar Challenge.
Sunswift Racing is the solar car racing team of the University of New South Wales in Sydney, Australia. The team currently holds a number of world records and is best known for its participation in the World Solar Challenge (WSC). Since its founding in 1996 by Byron Kennedy, the Sunswift team has built a total of 7 cars, the most recent of which is Sunswift 7.
Durham University Solar Car, formerly Durham University Electric Motorsport, is a student-run team in the United Kingdom that designs and constructs solar powered cars to compete in international competitions. It is the longest running solar car team in the UK and is financed entirely by third party donations and sponsorship.
Solar car racing refers to competitive races of electric vehicles which are powered by solar energy obtained from solar panels on the surface of the car. The first solar car race was the Tour de Sol in 1985 which led to several similar races in Europe, US and Australia. Such challenges are often entered by universities to develop their students' engineering and technological skills, but many business corporations have entered competitions in the past. A small number of high school teams participate in solar car races designed exclusively for high school students.
An electric vehicle battery is a rechargeable battery used to power the electric motors of a battery electric vehicle (BEV) or hybrid electric vehicle (HEV).
A photovoltaic system, also PV system or solar power system, is an electric power system designed to supply usable solar power by means of photovoltaics. It consists of an arrangement of several components, including solar panels to absorb and convert sunlight into electricity, a solar inverter to convert the output from direct to alternating current, as well as mounting, cabling, and other electrical accessories to set up a working system. It may also use a solar tracking system to improve the system's overall performance and include an integrated battery.
The Mitsubishi i-MiEV is a five-door hatchback electric car produced in the 2010s by Mitsubishi Motors, and is the electric version of the Mitsubishi i. Rebadged variants of the i-MiEV are also sold by PSA as the Peugeot iOn and Citroën C-Zero, mainly in Europe. The i-MiEV was the world's first modern highway-capable mass production electric car.
The lithium-titanate or lithium-titanium-oxide (LTO) battery is a type of rechargeable battery which has the advantage of being faster to charge than other lithium-ion batteries but the disadvantage of having a much lower energy density.
A wheel hub motor, hub motor, or in-wheel motor is a motor that is incorporated into the hub of the wheel. Wheel-hub motors are commonly found on electric bicycles. Electric hub motors were well-received in early electric cars, but have not been commercially successful in modern production cars.
The following outline is provided as an overview of and topical guide to solar energy:
Hanergy Holding Group Ltd. (Hanergy) is a Chinese multinational company headquartered in Beijing. The company is focusing on thin-film solar value chain, including manufacturing and solar parks development. It also owns the Jinanqiao Hydroelectric Power Station and two wind farms.
Stella and its successors Stella Lux, Stella Vie and Stella Era are a series of solar racing family cars, built for the World Solar Challenge in Australia, sofar winning its Cruiser Class all four times it was held – in 2013, 2015, 2017 and in 2019. Stella is considered the world’s first solar-powered family car and was given the 'Best Technology Development' Award at the 8th annual Crunchies in San Francisco in 2015. Being the only competing vehicle with a license plate, the road registration of Stella contributed to the winning score in the races. The vehicles are designed and built by "Solar Team Eindhoven" (STE) — some 26 students of different faculties of the Eindhoven University of Technology (TU/e) in the Netherlands. The group have set up a non-profit foundation to promote their concepts for practical solar vehicles for adoption on a broader scale.
There are many practical applications for solar panels or photovoltaics. From the fields of the agricultural industry as a power source for irrigation to its usage in remote health care facilities to refrigerate medical supplies. Other applications include power generation at various scales and attempts to integrate them into homes and public infrastructure. PV modules are used in photovoltaic systems and include a large variety of electrical devices.
The Lightyear 0 is an all-solar-electric car by the Dutch car manufacturer Lightyear. Production was originally scheduled to start in 2021, with a starting price of €250,000 incl. VAT. The first units were delivered in December 2022. In January 2023, Lightyear announced that it was halting production of the 0 model, and that Atlas Technologies B.V., the subsidiary responsible for the manufacture of the Lightyear 0, would be allowed to go bankrupt. After a restart and new investments the manufacturer is now focusing on a more affordable model, Lightyear 2.
The Aptera solar electric vehicle (sEV) is a two-seat, three-wheeled vehicle under development by the crowd-funded relaunched company, Aptera Motors. The Aptera's primary design goal is to be the most energy efficient vehicle in mass production. The design has an aerodynamic shape and uses lightweight carbon fiber and fiberglass composite materials, wheel hub motors, and built-in solar panels to significantly extend its range.
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