Encyclopedia Astronautica
1999.11.12 - ISS Status Report: ISS 99-44

Battery cycling of the five usable storage units inside the Zarya module was completed this week as controllers prepare for the next round of deep-cycling scheduled to begin late next week. The deep cycling of each battery takes about five days. The batteries store solar energy, which then is converted into electrical power for the Station's systems. Periodically, each battery is cycled to ensure its health and maintain its life.

The early communications system inside the Unity module continues to operate normally. Every week or two, commands are issued to switch between the right and left low gain antennas to ensure their health.

Other weekly checks included measuring and refining the spin rate of the complex, which is oriented with Unity pointed at the Earth. The slow spin maintains even temperatures on all systems and minimizes propellant usage.

All other Station systems are in excellent shape as it orbits at an altitude of 242 by 225 statute miles. Since the launch of Zarya last November, the ISS has completed more than 5,594 orbits. S

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