The solar panel can output 220V AC voltage through the inverter. Theoretically, with 220V power supply, it can charge the electric vehicle! However, the charging power is very small, the charger may not work, or the charging is slow and the charging time will be prolonged. In the absence of large-area and high-efficiency solar panels, it is meaningless for solar energy to charge cars.
In the past, the conversion rate of the most common crystalline silicon solar panel in the world was only about 17%. In the environment of light intensity 1000W / M and temperature 25 ℃, the output power per square meter of solar panel is about 170W. The output of solar panels is DC voltage, and solar inverters need to be used to convert DC into 220V AC.
After using the inverter, the power loss of the inverter is involved. The general efficiency of the inverter is about 90%. So 170W × 0.9 = 153w, when the standard illumination ambient temperature is 25 ℃, the output power of one square meter solar panel is about 150W. In other words, a 1m solar panel can only be used for electrical appliances below 150W.
If we use a single solar panel to charge the car, the following situation will occur: the inverter overcurrent enters the protection state and cannot effectively charge the car.
The car charging power is very large. Even the power of the portable slow charging line is about 3KW. When the 3KW load is inserted into the 150W inverter and the output current of the inverter increases n times, the input current of the solar panel will increase exponentially, close to short circuit.
At this time, the voltage of the solar panel will be pulled down rapidly. When the voltage is low to the low-voltage protection threshold of the inverter, the inverter will enter the protection mode and stop working. In this case, it is difficult to charge new energy vehicles.
If the problem of low voltage protection is solved and the car can be charged, the charging time will be extended indefinitely.
Assuming that the original 3KW charging line needs to be charged for eight hours, when the charging power drops to 0.15kw, the charging time will be extended by 20 times. It takes 160 hours to be fully charged, and the solar panel can not output full power at all times. The standard sunshine time in most areas is only about 6 hours. It takes a month to fully charge, which is very embarrassing!
The above calculation results are based on a solar panel with an area of one square meter. After all, the roof area is limited, and many models can only place 1-2 solar panels. In this case, it is unrealistic to charge the car, but it is still possible to replenish the auxiliary battery.
If it is a fixed site with n solar panels, it is no longer difficult to charge new energy vehicles! For example, there are 10pcs solar panels in the fixed site, and the power easily exceeds 1500W. The charging time for the car will be shortened to 16 hours. If there are 20pcs solar panels, the output power can reach 3000W. At this time, there will be no problem charging the electric car!
At present, many companies have developed high-efficiency 450-500w solar panels. If the surface of a car is covered with such solar panels, the area of solar panels can reach at least 3M.
At this time, the output power is close to 1500W, and 1500W can be output after six hours of illumination × 6h = 9000wh. If the charging efficiency is set at 90%, 9000wh can be charged into the battery × 0.9=8100wh。 If the power consumption of the vehicle is 16kWh / 100km, the 8kwh power can support the electric vehicle to travel about 50km, which has a certain practical value.
