Is it illegal to install solar panels on the roof of a car?
2 Answers
Installing solar panels on the roof of a car is not illegal, but it is not recommended. The performance of solar panels is as follows: Slow charging of solar panels: Under full sunlight, a monocrystalline silicon solar panel can charge about 1 kWh of electricity in 10 hours per square meter. However, the roof area of a general passenger car is very small. Even if two square meters of solar panels can be installed, it can only charge 1 to 2 kWh of electricity per day under sufficient sunlight. Low conversion rate of solar panels: The energy conversion rate of solar panels is still relatively low, only about 20%. Since the roof area of a car is only 1 to 1.5 square meters, the power generation is relatively low. Low-cost solar panels are also relatively heavy, and the electricity they generate may not offset the additional power consumption. Moreover, the strength of solar panels is relatively low, so they cannot replace the original roof. Thin and lightweight solar panels are also expensive, and the cost may not be recovered even if the car is worn out.
I heard many people are curious whether installing solar panels on car roofs is illegal. As a car owner who has looked into this, it really depends on local traffic regulations. In China, vehicle modifications must be registered with the DMV, otherwise it's considered illegal modification that can lead to penalty points and fines. Improper installation of solar panels may affect the car's aerodynamics and roof load-bearing capacity - if they fall off at highway speeds and hurt someone, that would be disastrous. So never install them casually yourself; always get professional evaluation first before applying for modifications. If installed properly just to save some air conditioning electricity costs, that's acceptable, but they're more reliably used as auxiliary charging for new energy vehicles. Remember safety first - don't violate regulations, or insurance won't cover accidents, making it not worth the risk. For genuine energy savings and environmental protection, consider buying factory models with built-in solar panels.
