These microprocessor controlled DC-DC converters use switch-mode technology to safely operate 12V DC equipment from onboard 24V power systems. The MAC converter has two main functions: to convert 24V from the onboard power system to 12V for navigation and communication equipment or to charge a 12V DC battery with a three-step charge characteristic. The MAGIC model offers full galvanic isolation between the input and output circuitry which filters out interference for more reliable electronic component performance. The MAGIC model can be used as a stabilized 12V power supply from a 24V battery bank, to charge a 12V battery with a three-step charge characteristic or as a 24V to 24V isolator/stabilizer in a 24V DC system. Both models function as an energy-efficient dimmer for up to 250 watt, multiple light installations and include a communication port for remote control. Three-step battery charging from 24 to 12V Voltage stabilization; 12 or 24V light dimmer