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A Space Power Subsystem Sizing program has been developed by the Aerospace Power Division of Wright Laboratory, Wright-Patterson Air Force Base, Ohio. Although a similar computational program has been developed in the Air Force, this program is integrated into a Quattro Pro spreadsheet. The Space Power Subsystem program (SPSS) contains the necessary equations and algorithms to calculate photovoltaic array power performance, including end-of-life (EOL) and beginning-of-life (BOL) specific power (W/kg) and areal power density (W/m2). These can then be displayed parametrically in graph form. Along the way equations are used to determine solar cell temperature effects, and cell performance degradation due to high energy particulate radiation as a function of altitude, orbital inclination, shield thickness and time in orbit. Additional equations and algorithms are included in the spreadsheet for determining maximum eclipse time as a function of orbital altitude, and inclination.