How many watts of solar panels are suitable for charging a car battery?

They're all a bunch of pseudo-scientists trying to satisfy their hunger. How can they need hundreds of watts of solar panels to charge their car battery? Why do you have to recharge it in a few hours? It's not a battery car. Charging the onboard solar battery only prevents the battery from losing power when the vehicle is stopped. It only requires a small amount of charging, so the stopped vehicle's battery is not depleted. the battery will be discarded. Once the vehicle is running, the generator will naturally charge the battery. When the vehicle is stopped, i.e. not charging, there is theoretically no need to charge. There is only a small amount of leakage, so only a small amount. charging is required. In principle, 5 watts and 10 watts are almost enough.