25 years old.
According to Baidu Encyclopedia, the four-wheel electric solar panel is encapsulated by tempered glass, which is strong, anti-hail, waterproof and impact resistant, with a long service life up to 25 years and a warranty period of 15 years. The device comes with a one-year warranty.
The solar panel is an optoelectronic semiconductor sheet that uses sunlight to directly generate electricity. Simple solar cells cannot be used directly as energy sources. To realize power supply, multiple solar cells must be connected in series, parallel and tightly sealed in the components.