Why don't new energy vehicles add solar charging panels on the roof?
Solar panels can generate electricity when there is sunshine , so in theory, solar panels can be used to charge the car. batteries, but why don't new energy vehicles in real life use this solution? In fact, there is still some gap between theory and practice, even though solar panels can produce electricity as long as there is sunshine. However, if the generated power is too low, it has no practical significance. Taking a new energy vehicle battery with a capacity of 70 kWh as an example, the electricity generated by the roof solar panel is just a drop in the ocean. can only increase battery life by a few kilometers after being exposed to the sun for a day! The conversion rate ofe solar energy is approximately 150 watts per square meter.
Of course, there are better. The roof of the car can be up to two square meters, which is 300 watts of electricity generation. If you guarantee 8 hours of sunlight per day, you will get 2.4 kilowatt hours. of electricity and 0.53 yuan per kilowatt hour of electricity, the daily exchange rate is 1.27 yuan. The tram uses around 15 kilowatt hours of electricity per 100 kilometers and can travel 16 kilometers per day. It's like a drop in the bucket. Vehicles are exposed to the sun every day and age seriously. The power generated by a car with a basement is even more pitiful. Its power output is not enough to drive a moving vehicle. parked is too low, so it is more suitable to build large solar panels to generate electricity.
Some users who often play outsidechoose to install a set of solar charging panels on the roof of their car, of course I don't pay much attention to trams and think there should be pure ones; electric vehicles equipped with solar charging on the Bar roof? In fact, it is a balance between cost and performance. The capacity of the vehicle's lead-acid battery is too small, so the solar panel on the roof can achieve a certain effect. However, the pure power battery capacity of electric vehicles is too large, and the charging effect of solar panels is too negligible. Comparing lead-acid car batteries with tram batteries is like comparing a bathtub with a swimming pool! The American version of the Sonata Hybrid is equipped with solar panels installed on high-end models.
As long as there is light, whether parking or driving, this panel can charge the battery, but don't get too excited. The rated charging power of this thing is only 205W, which means. that in the hot summer, it takes 5 hours to charge 1 kilowatt hour of electricity. Tesla Model 3, the most energy-efficient new energy vehicle, consumes more than 10 kilowatt hours of electricity per 100 kilometers under ideal working conditions. Parking in the open for a day can add several miles of cruising range. Officials also said that 6 hours of exposure to sunlight can increase the car's pure electric cruising range by 2 miles (32 kilometers). , this 1 degree of electricity is not enough. Turn on the air conditioner for half an hour.
Shading solar panels also reduces overall solar efficiency, cars do not absorb energy properly when parked under the shade of trees or in underground garages, and our infrastructure and nOur cultural norms do not allow the design of solar cars. Additionally, solar panels also have a lifespan. In an environment with poor heat dissipation, the conversion rate will decrease quickly! Some colleagues discovered that after installing solar panels on the roof, electricity production dropped by more than 20% after a year! It can be seen that adding a battery panel does not significantly increase the cruising range, and there are more later problems, so no car manufacturer is willing to do such thankless things!
Only certain cars built specifically for the environment will consider installing solar panels! In general, solar panels can only be used in relatively large areas, especially in places with good lighting conditions, but when used on cars, iThey are more gimmicks than real effects. The main issues relate to technology maturity, overall ease of use and cost-effectiveness. Installing rooftop solar can increase the battery life of electric vehicles by about 5-10% with the current technical level, especially in scenarios where air conditioning is insufficient. used in winter as in summer, it already has practical value.
1. First, add a solar panel to charge the auxiliary battery.
2. Second, install a luggage frame. Secure the solar panel into the luggage frame.
3. Finally, use multi-layer panels, apply waterproof paint and partially attach waterproof membranes to install solar cooling on the roof box.