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Rover Power

Rover Power. Ideal Operating Time for Minimized Power System. 1. Solar Panel 0.09m 2 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. 2. 86 hours of positive return. 3. Assumptions.

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Rover Power

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

  2. [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 2

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

  4. Assumptions [Jeff Knowlton] [Power] 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 4

  5. Initial Power Use Values [Jeff Knowlton] [Power] 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 5

  6. [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 6

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

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

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