There is no one-size-fits-all answer to this question, as the size of solar panel you need will depend on a number of factors, including the size and type of electric car you have, the amount of sunlight your location receives, and the size and type of solar panel you install. That said, a good rule of thumb is that you will need about 10 to 20 solar panels to charge an electric car.
Keep in mind that the size of solar panel you need may vary depending on the type of electric car you have. For example, a smaller electric car will require fewer solar panels than a larger electric car. And, while solar panels come in a variety of sizes, not all solar panels are created equal. Make sure to choose a solar panel that is right for your needs.
Sunlight is also an important factor to consider. Not all locations receive the same amount of sunlight, so you may need more or less solar panels depending on where you live. In general, the more sunlight your location receives, the fewer solar panels you will need.
Finally, the size of the solar panel you install will also play a role in how many panels you need. A small solar panel may only produce enough energy to charge a small electric car, while a large solar panel may be able to charge a larger electric car.