Not illegal, but generally of no practical value. This car has its own energy storage system and also provides direct current. It is better to install solar panels and aluminum panels on the roof to avoid any weight loading and risk.
The rooftop solar cell is a thin, semiconductor optoelectronic device that uses sunlight to directly generate electricity. On September 24, 2009, China Yingli Photovoltaic Application Technology Research Institute successfully developed the world's first rooftop solar cell and commercial photovoltaic module. The battery module can be used as a power source for automobile electrical equipment, thereby reducing the power generation load and fuel consumption of the engine, and can also be used as a supplementary device for the power source.
One million of subsidies for the purchase of cars