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Surviving the Lunar Night: Power management strategies for sustained operation

This document by Tony Cofer explores power requirements during the lunar night, comparing hydrazine and Li-ion batteries. It outlines a Nocturnal Power Controller interface with solar sources, saving battery weight and proposing a basic circuit design.

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Surviving the Lunar Night: Power management strategies for sustained operation

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  1. Power Group Tony Cofer Surviving the Lunar Night 03/25/09 [Tony Cofer] [Power] Page 1

  2. Power Needed at Night [Tony Cofer] [Power] Hydrazine specific energy = 973 W∙hr/Kg Li-ion batteries specific energy = 145 W∙hr/Kg Thermal equilibrium maintained but temperature distribution to be determined Page 2

  3. HydrazineHeater for 100g and 10kg System Controller [Tony Cofer] [Power] Page 3

  4. Nocturnal Power Controller Controller Interface Command Computer Comparator With Hysteresis Solar Source Actuator [Tony Cofer] [Power] Save 11.5 kg of batteries Controllable Size 2”X2”X1/2” Weight~20 g Power diss. 0.1mW Requires 0.23 g battery for 14 days Page 4

  5. Basic Circuit [Tony Cofer] [Power] Page 5

  6. Backup Slide [Tony Cofer] [Power] 10 W 14 days =10W∙14 days∙24 hrs/day= 3360 W∙hr Good catalyst reaction 200 kg/m2∙s 2.8 mg/s would need 1.4 X10-9 m2 Hrxn = -112093 J/mol = 3502916 J/Kg= 973 W∙hr Page 6

  7. Backup Slide - Parts List [Tony Cofer] [Power] 4081 Quad AND gate 4009 Hex Inverter MC33102 sleep mode op amp 4066 quad line driver 4068 dual D-latch Resistors 4 X 100k,2 X 2 meg 2 “X 2” circuit board Page 7

  8. Backup Slide - Actuators Common Relay Power Mosfet Pulse shut-off/turn-on [Tony Cofer] [Power] Page 8

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