These fans use photovoltaic (PV) panels to capture sunlight and convert it into electricity, eliminating the need for traditional power sources. The solar panel charges a rechargeable battery, which then powers the fan motor, often through a voltage regulator circuit. These fans can also be charged via a household power supply. When fully charged, the battery can run for approximately 10-11 hours. However, charging time may take longer (at least 10-12 hours) in cold or cloudy conditions due to insufficient direct sunlight.