Electrical Power |
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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).
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