The Magellan Power Control Unit (PCU) plays a key role in the spacecraft bus as the interface between the Solar Array, the Battery and the Spacecraft power bus. During sunlit periods, the PCU directs solar power into the batteries using either Direct Energy Transfer (DET) or Maximum Peak Power Tracking (MPPT). In parallel, the PCU transfers power from the batteries to the spacecraft bus while providing continuous telemetry on the health of the power bus.
Magellan designed the PCU to be scalable, meeting power needs of 100 W to 10,000 W spacecraft. Depending on the card configuration, the PCIJ can be configured as either single or dual string.