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This study investigates the reliability, maintainability, availability, and dependability of a series-parallel photovoltaic system comprising four subsystems: solar panels, inverters, water pumping machines, and tanks. By employing transition diagrams and the system of linear differential-difference equations are established. The primary objective is to analyze the system's reliability metrics and assess how system parameters influence its performance. Critical subsystems are identified based on these evaluations. Numerical analysis reveals insights into the system's performance, suggesting optimal reliability occurs when overall failure rates are minimized and support units are effectively activated.
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