With a good supply of sunlight, your Kalhuohfummi will be fully charged in about 4 - 6 hours. Remember, the better the position of the panel to the sun, the more power you produce. The blinking frequency of the horizontal energy display helps you to find the best position of your solar panel towards the sun. The faster it blinks, the more energy you produce. Each blink per second equals the amount of energy in watt you are currently producing (1 blink = 1 watt, 2 blinks = 2 watts, 3 blinks = 3 watts, 4 blinks = 4 watts).