Amazon.com: Daygreen 12V 24V 36V to 48V 10A 480W DC DC Step Up Boost Converter, Non-Isolated : Electronics
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
150W isolated DC/DC converters with very large input range