1. AAE450 Spring 2009 X 0 Power System Solar - Battery Solar arrays Tony Cofer- Power System

2. AAE450 Spring 2009 Gallium-Arsenide Solar Cell Array  ~ 300 W/m 2 at Earth orbit  65 W/kg specific power high end  $300/W cost  Twice as efficient as silicon but three times the price  Total energy is defined by max. power and duration of the mission  Size dictated by average power Tony Cofer- Power System

3. AAE450 Spring 2009 Previous Mission  Mars Exploration Rovers Used 100W 900 W/hr day max from panels Maximum solar power output - 140 watt Charged only a few hours a day  For X 0 rover Estimated area – 0.47 m 2 Estimated mass – 2.5 kg Tony Cofer- Power System

4. AAE450 Spring 2009 Extra slide  Earth to Mars Transfer Vehicle – 300W  Communications and control  At Lunar surface would need 1m 2  Mass would be approx. 5kg Tony Cofer- Power System

5. AAE450 Spring 2009 Extra Slide Tony Cofer- Power System Cell Efficien cy W/m 2 $/WMaturity Silicon12-14%150100In Use GaAs/Ge18-19%225300In Use GaInP 2 /GaAs/Ge30%300 New & In Use Amorphous Silicon8%80<< 100 In Development CuInSe10%135<< 100 In Development Source: Patel, Mukund R. “Spacecraft Power Systems.”