48 volt to 12 volt DC/DC converter, 40 to 65 volt input, 200 watt, Heavy Duty, military marine and industrial grade, 12V, 13.8V output.
12-48 Volt DC-DC Converter | aspen-compressor
High Power 12v To 48v 20a Dc Dc Boost Converter 12 Volt To 48 Volt 1000w Step-up Voltage Regulator For Electric Cars - Inverters & Converters - AliExpress
12v to 48v High Power DC-DC Converter - Model 6948