Yes, it is possible to charge an electric car battery using a solar panel. This can be a convenient way to keep a car battery charged, especially in remote locations or when grid power is not available. To charge a car battery with a solar panel, you will need a solar panel, a charge controller, and a battery. The solar panel will generate electricity, which will be passed through the charge controller to regulate the voltage and prevent overcharging. The regulated voltage will then be used to charge the car battery. It is important to choose a solar panel with enough power to charge the car battery in a reasonable amount of time, based on the battery's capacity and your daily solar availability. A charge controller with a low voltage disconnect function is also important to protect the battery from over-discharging, which can damage the battery and reduce its lifespan.