Solar photovoltaic (PV) systems are rapidly growing worldwide as a key clean energy solution. However, many people are unfamiliar with how they work and their critical components. This article provides an in-depth analysis of how solar PV systems are structured and operate, with detailed explanations of key equipment such as combiner boxes, over/under-voltage protectors, isolator switches, solar connectors, fuses, and molded case circuit breakers (MCCBs).