A three-axis stabilized satellite has two solar arrays. Each array has an area of 7m2. At the beginning of life each of the solar sails generate 4 kW of electrical power, which falls to 3.6 kW at the end of the satellite’s useful lifetime. 1 kW of power is needed for housekeeping (running the satellite systems) and 3 kW is devoted to the telecommunication system. a. Calculate the efficiency of the solar cells at beginning of life. Assume an incident solar power of 1.36 kW/m2, and normal incidence of sunlight on the sails. b. Calculate the efficiency of the solar cells at end of life. c. If one of the solar sails fails and produces no power, how much power is available to the telecommunication system

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.