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.
Amazon.com: DC DC Converter 48V to 12V, Power Source Voltage Step Down Converter 10A 120W DC to DC Converter 48V to 12V Voltage Buck Converter : Electronics
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Input 24V, 32V, 36V, 48V to 12V DC/DC voltage converter 400 Watts peak, PSEC-382
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High Power 12V to 48V 20A DC DC Boost Converter 12 Volt to 48 Volt 1000W Step-up Voltage Regulator for Electric cars - AliExpress
Victron Energy Orion-Tr 48/12-30A 360W Isolated DC-DC Converter – V O L T A I C O
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dc48-12 | PowerStream
Full power 12 volt to 48 volt dc dc converter 15A 720W boost step up transformer - AliExpress