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Check the listing for details. 10-75V/30A DC-DC Step up down Converter Buck Boost Converter for Fuel Cells. Condition: New. Listed at 135.80 USD. The input and output currents should be within 32A. YF-BKT80V30A 10-75V/30A DC-DC Step up down Converter Buck Boost Converter Full Set for Fuel Cells. - Input current is up to 40A. 3: The ripple current of the boost output capacitor is large, and the ripple of the buck input capacitor is large.