Opossum: The Nighttime Street Cleaning Robot Revolution

Solar-powered robot cleans city streets quietly after dark

Urban environments face increasing challenges in maintaining cleanliness without disrupting daily life. The Opossum cleaning robot, developed by Suzhou University of Technology, addresses this issue by operating exclusively at night. Drawing inspiration from the opossum's nocturnal behavior, the robot avoids daytime crowds and traffic, ensuring efficient cleaning with minimal disturbance. This innovative approach not only enhances urban hygiene but also aligns with the growing demand for sustainable city solutions.

One of the robot’s most distinctive features is its retractable suction head, modeled after a mantis arm. This unique mechanism allows the Opossum to reach and clean under parked vehicles, a task that traditional street cleaners often struggle with. The robot’s quiet operation and ability to work autonomously further reduce the workload of sanitation workers, particularly during early morning hours. By utilizing solar energy for charging during the day, the Opossum minimizes environmental impact and operational noise, setting a new standard for eco-friendly urban cleaning.

The realization of this design involved the use of lightweight aluminum alloy for the main body and high-strength engineering plastics for moving parts, ensuring both durability and agility. Advanced photovoltaic panels and energy-storage batteries power the robot, while a sophisticated navigation system—comprising sensors, cameras, and algorithms—enables precise, autonomous movement. The mantis-inspired suction head employs flexible materials and intricate mechanical structures, optimizing cleaning performance even in hard-to-reach areas.

Measuring 1560 mm in width, 3570 mm in length, and 1940 mm in height, the Opossum is engineered for urban environments. Its operation is fully autonomous: the robot activates at night, navigates streets while avoiding obstacles, and extends its cleaning arm under vehicles. After completing its route, it returns to its charging station, ready for another cycle. This staggered cleaning schedule ensures that city life remains undisturbed while maintaining high standards of cleanliness.

The development of the Opossum robot was not without challenges. The design team, including Zhu Wenzhuo, Lei Xi'er, and Zhang Weiwei, overcame significant technical hurdles such as engineering a flexible yet robust mechanical arm, creating a reliable navigation system for nighttime use, and developing an efficient solar-charging mechanism. Their efforts have resulted in a product that not only meets but exceeds the demands of modern urban sanitation.

Recognized with a Bronze A' Design Award in Robotics, Automaton, and Automation Design in 2025, the Opossum robot exemplifies how bionic inspiration and smart technology can drive sustainable urban innovation. Its success signals a promising future for cities seeking cleaner, quieter, and more environmentally responsible solutions.