been presented. This module will provide 25 kW of electric power to the users under all insolation conditions. In addition, the design meets the requirements for short term power peaking (up to 28.75 kW) and is capable of automated startup and shutdown operations. The design allows the launch of two complete SD modules with one Shuttle flight. It also has been designed to provide power during the 30-year Freedom lifetime by periodic, as needed, replacement of orbital replacement units. Assembly of the module on orbit will incorporate methods and procedures to be developed for other Freedom elements—no unique equipment will be needed. The technology base for SD development and production has been shown to exist at both the system and component levels. We have described the process by which SD becomes a part of the Space Station Freedom. The initial growth phase will increase the power level to 125 kW by the addition of two SD power modules, one at each end of the transverse boom. Power for Freedom's growth to about 300 kW will occur by adding SD modules. During the current baseline program, there is funding to conduct SD preliminary design, define software (hooks) and hardware (scars) features which must be incorporated into the design of baseline Freedom, and conduct development testing of critical SD components and key subsystems. We have clearly indicated the reasons for adding SD power to Freedom. The tremendous life cycle cost savings, in conjunction with the advantage of having a
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