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The 2020 Hyundai SonataHybrid is officially launched in South Korea, the world's first mass-produced car with a roof-mounted solar charging system. In addition to sales in South Korea, the car is about to land in the North American market, but has not yet planned to sell in Europe or China.
As early as 2012, Toyota introduced the optional Prius solar charging system for its first mass-produced hybrid Prius, but it can only supply the vehicle ventilation system when parking, and as a vehicle 12V lead acid. Auxiliary charging power for the battery.
In contrast, as the world's first mass-produced "solar car", the 2020 Sonata Hybrid's roof-top solar system can charge the battery of the hybrid system. For this technology, is modernity playing the nature of tickets, or is it serious? Does this mean a new direction of development, is there any other players to follow up?

01
Modern roof solar charging system
At present, Hyundai has planned three generations of products for the roof solar system. Among them, the 2020 Sonata Hybrid is equipped with the first generation of roof solar charging system to charge the 1.76kWh battery.
As the first generation system, the current power from the roof solar panel is very small, and the charging efficiency is also very low. In 6 hours, only 1.76 kWh of battery can be filled with 30%-60% of the battery, but it can be realized. Charging during the driving process of the car can theoretically increase the mileage of 1,300 kilometers per year.
“The roof solar charging system is a good example of how Hyundai can be a clean mobile supplier. This technology enables our customers to actively address emissions issues. We are working hard to further extend the application of this technology from environmentally friendly vehicle lineups. Expanded to the internal combustion engine vehicle, said Heui Won Yang, senior vice president and head of the body technology department of Hyundai Motor Group.

In order to achieve the goals of Hyundai, technicians are testing the second and third generation roof solar charging systems. Here are some plans:
1. The second generation will be integrated into the panoramic sunroof of internal combustion engine vehicles. Hyundai Motors said its main purpose is to help these vehicles meet increasingly stringent CO2 emissions regulations.
2. The third generation system is currently being tested to improve the energy output of pure electric vehicles, with the panels integrated in the roof and engine hood.
From the above planning, we can see that the modern decision to promote the roof solar charging system is very large, but from the first generation of product data can also see a lot of room for improvement, and, at present, do not know the specific cost. I hope that in the second and third generation products, there will be better improvement in charging efficiency.
02
More "solar car" players
Hyundai is not alone on the road to exploring “solar cars”. There are many players in China and abroad, and international auto giants such as Toyota are exploring “solar cars”. Let’s take a look at those. "Peer".
1
China Hanergy
As early as 2016, Hanergy Group released four solar electric vehicles, namely Solar A, Solar R, SolarO and Solar L. The four models have different positioning. On CES Asia2018, Hanergy once again exhibited solar A, but CESAsia 2019 did not see Hanergy.
According to the data of the time, Solar A's solar panels amounted to 7.5 square meters. It can be illuminated for 5-6 hours in ample sunshine every day. It can send about 8-10 kWh to support this 1.2-ton vehicle. 80 kilometers, with an average annual driving speed of more than 20,000 kilometers.
At CES Asia 2018, Zhang Bin, executive director and senior vice president of Hanergy Thin Film Power Group, said that it is working with related companies such as Audi, FAW and BAIC, and will realize mass production of solar vehicles in the next 2-3 years.

2
Dutch startup Lightyear
In June, Lightyear, the Dutch electric car startup, announced the prototype of the first production car called "Lightyear One" with a cruising range of 450 miles and is scheduled to be delivered in 2020 at a scheduled price of £133,000.
Lightyear was founded by the Eindhoven team for the 2013, 2015 and 2017 World Solar Challenges, co-founder and CEO Lex Hoefsloot said that when the weather is bad, solar charging is not available, It can be charged through an ordinary household outlet, and can enjoy 400 kilometers of battery life for one night.
In typical Dutch weather, One is expected to use solar energy to drive about 5,000 to 6,000 miles a year. According to the WLTP test cycle, its battery can provide nearly 450 miles of cruising range when fully charged.
At the end of last year, Lightyear announced a partnership with Leaseplan to make its cars available for lease and purchase when it was launched in 2020. The company also opened a production plant in Helmond, the Netherlands. Currently, the company has 100 employees, including former Tesla, Ferrari and Jaguar employees.

3
Toyota, Sharp, Japan
In July 2019, Toyota Japan announced that it would test new solar cell technology on the road through specially designed demonstration vehicles. The object of the collaboration is Sharp, which has been developed by Sharp as a high-efficiency solar panel developed by the New Energy and Industrial Technology Development Organization (NEDO), installed on the roof, bonnet and trunk lid of the Toyota Hybrid Prius.
According to reports, the above solar panels can generate about 860 watts of power, conversion efficiency of 34%, which is much higher than the current production version of 22.5%, and compared to the production version can only be used when parking Powered by a ventilation system or powered by a 12V lead-acid battery, the new system can charge the power battery during driving.

The solar cells are laminated in the resin on top of the curved glass roof to match the Prius's conventional hardtop design. Unfortunately, this tempered glass sheet has not passed the rollover crash test in the United States, so the solar roof option is currently only available for Prius in Japan and Europe.