SMAKN&reg; Waterproof DC-DC Boost Buck module 6V / 12V / 24V / 36V 6-36V to 13.8V 5A 69W Power Converter Input voltage: DC 8-40V. Output voltage: 13.8V. Output Current: 5A. Output Power: 69W. Conversion efficiency: 96% (half load), 94% (full load).