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Phase II Final Report - NASA's Institute for Advanced Concepts

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Chapter 3.0 Vehicle Design<br />

3.6 Power System<br />

7<br />

6<br />

5<br />

4<br />

3<br />

2<br />

Latitude 0°<br />

Latitude 85°, Vernal<br />

Equinox<br />

1<br />

-1<br />

0<br />

0 5 10 15 20 25 30<br />

Time (Hours)<br />

Figure 3-180: Solar Array Average Output Power <strong>for</strong> the Equator and 85 o North Latitude<br />

at Day 170 (Summer Solstice, Northern Hemisphere)<br />

Table 3-25: Specifications <strong>for</strong> Lithium Polymer Batteries, Ultralife Battery Model<br />

UBC543483<br />

[264]<br />

Battery Property<br />

Value<br />

Cell Operating Voltage<br />

Capacity<br />

Maximum Discharge Rate<br />

Energy<br />

Energy Density<br />

Cycle Life<br />

Operating Temperature<br />

Charging Temperature<br />

Storage Temperature<br />

Self Discharge<br />

4.15 V to 3.0 V (3.8 V nominal)<br />

930 mAh at C/5 rate*<br />

2C (continuous), 5C (pulse)*<br />

3.5 Wh<br />

135 Wh/kg, 250 Wh/1<br />

>300 cycles at C/2 to 80% of initial capacity (no memory effect)*<br />

-20 o C to 60 o C<br />

0 o C to 45 o C<br />

-40 o C to 60 o C<br />

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