The objective of this research is to optimize the availability of a photovoltaic (PV) solar power plant. A PV solar plant is a complex system in which multiple subsystems are connected to each other. It consists of three subsystems PV modules, inverter, and transformer. All three subsystems are connected to each other in series configuration. The steady state availability is formed by using normalizing equations and Chapman Kolmogorov equations to improve the availability of PV solar power plants. All the failure and repair rates of the system are statistically independent and exponentially distributed. Through numerical results the availability of PV solar plant was found to increase from 0.983005 to 0.984553 as the repair rate increases.