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The recent trends in power system design at NASA’s Goddard Space Flight Center (GSFC) have reflected the agency’s move toward faster, better and cheaper spacecraft. The demand for a less expensive and standardized spacecraft bus, in addition to a push for accelerated development times has resulted in fewer custom-designed components and more use of commercial off-the-shelf (COTS) products. The more recent power system designs at GSFC have utilized the advances in technology to meet mission requirements while also shrinking weight, volume, cost and development time.