SolarSwift: Quick and Clean USB Charging Multinode Station for Public

The SolarSwift project proposes a stand-alone, solar-powered USB charging multinode station intended for public use in areas such as bus stops, railway stations, college campuses, marketplaces, and rural locations. In recent years, mobile phones have become essential for communication, digital transactions, navigation, and emergency services. However, the availability of convenient and reliable charging facilities remains limited, particularly in regions affected by irregular grid power supply. To overcome this limitation, the SolarSwift system utilizes a 12 V photovoltaic panel combined with a charge controller, a rechargeable battery, and a high-efficiency DC–DC buck converter to provide a stable and regulated 5 V output suitable for multiple USB charging ports. In addition to device charging, the system integrates an automatic LED streetlight controlled using a light-dependent resistor (LDR), allowing illumination during nighttime conditions without reliance on external electricity. The design approach emphasizes efficient energy management, compact structure, voltage stability, and battery protection to ensure reliable operation under varying environmental conditions. Performance evaluation through practical observations and simulation indicates consistent charging performance, sufficient energy storage, and dependable operation throughout day and night cycles. The SolarSwift system highlights the potential of decentralized solar solutions to improve public convenience, reduce dependence on conventional power sources, and promote sustainable and inclusive energy infrastructure in both urban and rural settings.