Ideal Operating Time for Minimized Power System

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Presentation transcript:

Ideal Operating Time for Minimized Power System Rover Power Ideal Operating Time for Minimized Power System [Jeff Knowlton] [Power] 1

[Jeff Knowlton] [Power] Solar Panel 0.09m2 Max output 38 watts Battery 40Watt-hours Can run the rover for 1.1 Hours ( Not transmitting) Dictating time from deployment to time entering the sun [Jeff Knowlton] [Power] 2

[Jeff Knowlton] [Power] 86 hours of positive return [Jeff Knowlton] [Power] 3

[Jeff Knowlton] [Power] Assumptions CPU, thermal controls and motors run continuously Mare Cognitum landing sight 3 degrees south of Equator Waiting in Lander for optimal departing time Power use for transmitting takes less than five second for all required components [Jeff Knowlton] [Power] 4

Initial Power Use Values CPU -5 watts Thermal -20 watts (2.5 safety factor) Driving motors – 10 watts (1.08 safety factor) Camera-18 watts(Video camera not yet still camera) Transmitter- 6.25 watts Antenna-0.2 watts [Jeff Knowlton] [Power] 5

[Jeff Knowlton] [Power] Maximum drive time: 86 hours Ideal Deployment 130 hours after daybreak Reduced to 72 hours for mission completion cushion (Safety factor 8) Maximum permanent angle displacement:19.5 degrees 15 degrees permanent slope 3 degrees landing sight 1.5 degrees lunar axis tilt 1.6 watt surplus 4 hour survival on 45 % incline [Jeff Knowlton] [Power] 6

[Jeff Knowlton] [Power] Transmitting costs (18w+6.25w+0.2w)*5(second)*5(transmissions per hour)/3600(seconds per hour) 0.1712 watt-hours [Jeff Knowlton] [Power] 7

[Jeff Knowlton] [Power] Note 3600 watts is 1 watt-hour By comparison the battery is 40 watt hours Not including possible angle offset [Jeff Knowlton] [Power] 8