Evolutionary growth for Space Station Freedom electrical power system

The Space Station electrical power system is designed with the flexibility to accommodate emerging technologies and expert systems over an operational lifetime of 30 years and is being designed with the necessary software hooks and hardware scars to accommodate growth. The electrical power system is planned to grow from the initial 75 kW to 300 kW. The phase-I station will utilize photovoltaic arrays to produce the electrical power; however, for growth to 300 kW, solar dynamic power modules will be utilized. Pairs of 25 kW solar dynamic power modules will be added to the station to reach the higher power levels. The addition of solar dynamic power in the growth phase places constraints on the initial Space Station systems such as guidance navigation and control, external thermal factors, truss structural stiffness, computational capabilities and storage which must be taken into account in order to facilitate the addition of the solar dynamic modules