A novel electrostatic-driven propulsion system and ultra-light kilovolt power system have been developed to enable sunlight-powered hovering of an ultra-light micro aerial vehicle (MAV). The vehicle, weighing 4.21 grams, is the lightest and smallest sunlight-powered aerial vehicle capable of sustained hovering under natural sunlight conditions. It features an electrostatic motor with a lift-to-power efficiency of 30.7 g·W⁻¹ and a total lift-to-power efficiency of 7.4 g·W⁻¹. The propulsion system uses an ultra-light kilovolt power system to generate 9 kV of high voltage, enabling efficient power conversion and low power consumption. The vehicle's design includes an electrostatic motor and a high-voltage power converter, which together achieve the first sunlight-powered hovering of a MAV. The system demonstrates significant improvements in lift-to-power efficiency compared to existing technologies, with the electrostatic motor achieving a 2-3 times higher efficiency. The vehicle's design also allows for miniaturization, with a prototype weighing 9 mg and achieving tethered flight with a lift-to-power efficiency of 9.2 g·W⁻¹. The system's low power consumption and high efficiency make it suitable for long-duration and long-range aerial reconnaissance applications. The research addresses the challenges of limited flight duration and energy efficiency in ultra-light MAVs, offering a promising solution for sustainable and efficient aerial operations.A novel electrostatic-driven propulsion system and ultra-light kilovolt power system have been developed to enable sunlight-powered hovering of an ultra-light micro aerial vehicle (MAV). The vehicle, weighing 4.21 grams, is the lightest and smallest sunlight-powered aerial vehicle capable of sustained hovering under natural sunlight conditions. It features an electrostatic motor with a lift-to-power efficiency of 30.7 g·W⁻¹ and a total lift-to-power efficiency of 7.4 g·W⁻¹. The propulsion system uses an ultra-light kilovolt power system to generate 9 kV of high voltage, enabling efficient power conversion and low power consumption. The vehicle's design includes an electrostatic motor and a high-voltage power converter, which together achieve the first sunlight-powered hovering of a MAV. The system demonstrates significant improvements in lift-to-power efficiency compared to existing technologies, with the electrostatic motor achieving a 2-3 times higher efficiency. The vehicle's design also allows for miniaturization, with a prototype weighing 9 mg and achieving tethered flight with a lift-to-power efficiency of 9.2 g·W⁻¹. The system's low power consumption and high efficiency make it suitable for long-duration and long-range aerial reconnaissance applications. The research addresses the challenges of limited flight duration and energy efficiency in ultra-light MAVs, offering a promising solution for sustainable and efficient aerial operations.