This article presents a novel electrostatic-driven propulsion system and an ultra-light kilovolt power system, enabling the first sunlight-powered hovering of a micro aerial vehicle (MAV) under natural sunlight conditions. The vehicle, weighing only 4.21 grams, is the smallest and lightest sunlight-powered rotorcraft capable of achieving untethered flight and sustained hovering. The electrostatic motor, designed with a radius of 60 mm, operates at a voltage range of 2.5-8.5 kV and provides a constant torque, allowing the vehicle to maintain stable hovering. The high-voltage power converter (HVPC) uses a forward-flyback converter with a 12-stage Cockcroft-Walton voltage multiplier, achieving a high output voltage of 9 kV while minimizing component size and mass. The solar cells, made of GaAs thin-film, have a maximum power density of 0.8 W/g and provide the necessary power for the HVPC. This system demonstrates a significant improvement in lift-to-power efficiency, making it a promising solution for extending the flight duration of MAVs.This article presents a novel electrostatic-driven propulsion system and an ultra-light kilovolt power system, enabling the first sunlight-powered hovering of a micro aerial vehicle (MAV) under natural sunlight conditions. The vehicle, weighing only 4.21 grams, is the smallest and lightest sunlight-powered rotorcraft capable of achieving untethered flight and sustained hovering. The electrostatic motor, designed with a radius of 60 mm, operates at a voltage range of 2.5-8.5 kV and provides a constant torque, allowing the vehicle to maintain stable hovering. The high-voltage power converter (HVPC) uses a forward-flyback converter with a 12-stage Cockcroft-Walton voltage multiplier, achieving a high output voltage of 9 kV while minimizing component size and mass. The solar cells, made of GaAs thin-film, have a maximum power density of 0.8 W/g and provide the necessary power for the HVPC. This system demonstrates a significant improvement in lift-to-power efficiency, making it a promising solution for extending the flight duration of MAVs.