1. Ideal Operating Time for Minimized Power System
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
[Jeff Knowlton] [Power] 2

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

4. [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

5. 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 watts
Antenna-0.2 watts
[Jeff Knowlton] [Power] 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
[Jeff Knowlton] [Power] 6

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

8. [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