An Overview of the Electrical Power Subsystem of the First Turkish Lunar Mission

The First Turkish Lunar Mission is an ongoing space research mission of the Space Technologies Research Institute of the Scientific and Technological Research Council of Türkiye (TUBITAK UZAY) under the National Space Program coordinated by Turkish Space Agency (TUA). The mission will be the first of a two-phase program which will perform a Lunar orbit acquisition, carry out scientific observations and attain hard landing on the lunar surface as part of its main objectives. This paper describes the design details of Electrical Power Subsystem (EPS) in terms of architecture, redundancy concept, autonomous operation, and sizing. EPS includes one deployable and rotatable solar array wing (SAW). Rotation of SAW is enabled by a dedicated Solar Array Drive Mechanism which is controlled by a Solar Array Drive Electronics. For energy storage, one Li-Ion Battery Block is utilized. To control and distribute the power, a Power Conditioning and Distribution Unit (PCDU) is designed.