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Isolated Step-down
RCNUN High Efficiency 12V-48V 15 Amp Step Up DC to DC Power Converter 12V to 48V 10A DC-DC Boost Voltage Regulator - AliExpress
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72V to 48V 10A 480W DC DC Step Down Converter Voltage Regulator w/ACC – Daygreen
Allied Lithium 36V/48V to 12V StepDown Voltage Converter 30 Amp Max - Allied Lithium Golf Cart Batteries
DC-DC Step Down Buck Converter (15-72v) 24V 36V 48V 60V to 12V 5A 60W – TorqueTech
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Marine DC-DC Converters | 12V, 24V, 36V and 48V DC | 3 - 50 Amps | Newmar | DC Power Onboard