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First on-orbit data from the Forward Technology Solar Cell Experiment (FTSCE) are presented. FTSCE is housed within the 5 th Materials on the International Space Station Experiment (MISSE-5), and currently resides on the exterior of the ISS. A range of solar cell technologies are included in the experiment including triple junction (3J)

The Interim Control Module (ICM) is being built by the US Naval Research Laboratory (NRL) for NASA as a propulsion module for the International Space Station (ISS). Originally developed as a spinning spacecraft used to move payloads to their final orbit, for ISS, the ICM will be in a fixed orientation and location for long periods resulting in substantial solar panel shadowing. This paper describes the methods used to determine the incident energy on the ICM solar panels and the power capability of the electric power system (EPS). Applying this methodology has resulted in analyses and assessments used to identify ICM early design changes/options, placement and orientations that enable successful operation of the EPS under a wide variety of anticipated conditions. Service module capabilities and enhance overall reliability. Phase 3 examined another option in which it would be placed on the US side of ISS. Here it would also augment the Service Module, but this placement would reduce interfaces between US and Russian elements. METHODS The assessment of ICM power capability was composed of two tasks: determination of the incident energy on NASA/TM-1999-209378 I 14. SUBJECT TERMS International Space Station: Electric power; Shadowing; Models 17. SECURITY CLASSIFICATION