Design and Development of a Multi-Output DC- DC Buck Converter for Off-Grid Solar-Powered DC Homes

Abstract

The adoption of renewable energy technologies has seen unprecedented growth in recent years, driven by the urgent need to transition away from fossil fuels and mitigate climate change. Among the various renewable energy solutions, solar power has emerged as a leading contender due to its widespread availability and versatility. In particular, off-grid solar systems are playing a transformative role in providing electricity to remote and underserved areas. These systems, especially those operating on Direct Current (DC), offer significant advantages in terms of efficiency and simplicity by eliminating the need for inverters. However, as DC-powered homes become more prevalent, they face a critical challenge: the varying voltage requirements of modern appliances. Unlike Alternating Current (AC) systems, where appliances are standardized to operate on a fixed voltage, DC appliances often require different voltage levels, such as 12 V for lighting and fans, or higher for refrigerators and specialized equipment. This diversity necessitates the use of multiple DC-DC converters, each tailored to a specific appliance, leading to increased costs, system complexity, and maintenance burdens. Our project aims to address these issues by developing a novel DC-DC converter that can accept a wide input voltage range (24–48 V DC) and providetwo distinct outputs: a fixed 12 V DC for standard appliances and a variable DC output to accommodate diverse voltage requirements. The proposed solution is designed to simplify voltage management in DC homes, reduce costs, and enhance overall system efficiency, paving the way for more practical and widespread adoption of DC-powered residential systems.