The voltage required for direct current (DC) can vary considerably onboard a yacht. A bowthruster or a winch often works at 24 V, while navigation and communication equipment mostly requires 12 V. By using a DC-DC converter, other voltages than applied in your basic system can be reached. They also ensure that all your onboard equipment has a stable power supply with the right voltage.
The Magic models can regulate the voltage both up and down to ensure an optimal voltage stabilisation, even when the battery voltage fluctuates due to heavy loads. The galvanic isolation between input and output prevents disruptions to, for instance, communication equipment.