Ian Meginnis January 29, 2009 Group Leader - Power Systems

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Presentation transcript:

Ian Meginnis January 29, 2009 Group Leader - Power Systems Power Systems Sizing Ian Meginnis January 29, 2009 Group Leader - Power Systems Ian Meginnis Power Systems

Battery Sizing Secondary batteries used for lunar lander (LL) and rover Size of LL batteries dictated by power requirement for 2 weeks of darkness LL battery mass =~ 45kg Based on requirement of 10 Watts for 2 weeks Mass of rover batteries based how much power is needed prior to solar array deployment Occurs soon after landing Rover battery mass =~ 0.5kg Ian Meginnis Power Systems

Data from Busek Co. Inc. Ian Meginnis Power Systems

Backup Slide Calculation of battery size for LL: Li-ion Energy Density: 145 Wh/kg Thermal Power Requirement: ~10 Watts Total Time in Darkness: 2 weeks (672 hr) Battery Mass = 672hr * 10W / 145Wh/kg = 46 kg Calculation of solar array sizing for rover: Need to power several devices: Turn on and operate computer (RAD6000): ~10W; 1.0hr Egress LL: ~10W; 1.0hr Solar array deployment: ~6W; 1.0hr Ian Meginnis Power Systems

Backup Slide (cont.) Solar arrays comprised of triple-junction Gallium Arsenide (GaInP2/GaAs/Ge) Produce ~300W/m2 Busek Hall-Effect Thrusters: Model Input Power (W) Thrust (mN) Solar Array Size (m2) BHT-200 200 12.8 0.7 BHT-600 600 42.0 2.0 BHT-1000 1000 58.5 3.3 BHT-1500 1700 102.0 5.7 BHT-8000 8000 512.0 26.7 BHT-20k 20250 1080.0 67.5 Data from Busek Co. Inc. Ian Meginnis Power Systems

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