This paper summarizes development of a 10KW stand-alone power processing unit for 5KW SOFC-low voltage battery hybrid fuel cell power generation system. The power processing unit Includes three parts a high frequency DC-DC converter boosts low fuel cell voltage, a DC-AC inverter converts a dc voltage into a regulated ac voltage and a bidirectional DC-DC converter charges or discharges the battery. The converter topology, design, control method, and experimental result arc presented to meet the specifications such as efficiency of 90% and cost of $40/KW laid down for the "2003 Future Energy Challenge Competition" organized by the U.S. Department of Energy and IEEE. and IEEE.