Electrical Power

Electrical Power


All of the spacecraft's power is generated, stored and distributed by the electrical power subsystem. The system obtains its power from an array of gallium arsenide solar cells. A power distribution and drive unit contains switches that send power to various loads around the spacecraft. Power is also stored in a 16-amp-hour nickel hydrogen battery.

The electrical power subsystem operates the gimbal drives on the high-gain antenna and the solar array. It contains also a pyro initiator unit, which fires pyrotechnically actuated valves, activates burn wires, and opens and closes thruster valves.

The electrical power subsystem weighs 86.0 kilograms (189.6 pounds).