12V volt to 48 volt DC/DC converters (common negative) 1250 Watts Robust, marine, heavy duty from PowerStream.
Amazon.com: XWST DC 12V Step up to 48V 1.5A 72W Converter Voltage Converter, 48Volt Regulator Waterproof DC/DC Boost Transformer Power Supply (12V to 48V 1.5A) : Electronics
DC-DC Boost Converter, 12V to 48V | ATO.com
Daygreen 12V 24V 36V to 48V 10A 480W DC DC Step Up Boost Converter, Non-Isolated : Electronics - Amazon.com
Amazon.com: Akozon Buck Converter DC-DC 12V/24V/36V/48V to 5V 3A Buck Converter Step Down Power Supply Module : Electronics
Golf cart DC converter 48V 48 volt voltage reducer regulator to 12V 20A 240W | eBay
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
DC 48V Step-down to 12V 30A 360W Waterproof DC Converter Regulator - Walmart.com
Isolated DC-DC Converter, 48V to 12V | ATO.com
288W Car Converter DC 12V (9~30V) to 48V 6A Boost Voltage Regulator/Power Supply
48V to 12V 10A 20A 240W Voltage Reducer DC DC Step Down Converter CE RoHS Certificated High Efficiency 48VDC to 12VDC 20 AMP - AliExpress
36V 48V to 12V 13.8V 80A 1104W DC DC STEP DOWN CONVERTER VOLTAGE REGUL – Daygreen