Grid connected solar photovoltaic (PV) plants are currently play the vital role in the generation of electrical power in many countries, such as Malaysia, which is transitioning toward the use of renewable energy. This paper presents a method and analysis for assessing the reliability of a 1 MW grid-connected solar PV system. Theoretically, all components in the system can fail randomly and their effect to the system can be elucidated by using Fault Tree Analysis (FTA) method. In this study, FTA is used to comprehend the interdependencies of all the components that make up the system. Without any component repair, the system’s failure in year is approximately 17% whereas that with repairs is shown to decrease to 1.4%. Importance Measure (IM) analysis is performed to gain a deeper understanding of the system’s critical components. It is shown that PV module is the key component to the reliability of the system, as it is the main critical component in the system.