Many of us may think that a solar charger is only functional in direct sunlight. But this is not true. There are photons in natural daylight. Solar panels are used to convert photons into electricity. So a solar charger can be used in natural daylight with its full potential, and direct sunlight is not needed. That is why you can use a solar charger on rainy and gloomy days, and even on the days of winter when the sunlight is dim.