Transforming from 12 to 240V? You need an Inverter. Need 12V from a 24 Volt source?? You need a converter. Just make sure you select a product that has the power capacity to run the device you're trying to use.
AP8287
Input Voltage: 24V DC Output Voltage 12V DC Maximum current output: 12 A Compact Size: 100 x 66 x 44 mm
Designed for use in 24 Volt vehicles. Specifically for the installation 12 Volt single or double DIN headunits. It has both a constant and accessories wire, allowing you to retain AM/FM station memory as well as any saved resets on aftermarket headunits.