12V volt to 48 volt DC/DC converters (common negative) 1250 Watts Robust, marine, heavy duty from PowerStream.
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Efficiently bridging 48V and 12V systems | Vicor
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12V 24V 36V to 48V 10A 480W DC DC Step Up Converter Voltage Regulator – Daygreen
Sealed 120W DC/DC Converter 36/48V to 12V 10A
48V - 144V to 12V 13.5 dc/dc dc converter | Taizhou Quanshun Motor Co., Ltd.
48V to 12V 25A 300 Watt DC/DC converter PKL4313PITLA from Ericsson, in stock
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DC-DC 5V~35V to 12V 24V 48V High Voltage Boost Converter Step-up Booster Module | eBay