Power & Energy Budget
Size a spacecraft solar array and battery from orbital energy balance, eclipse load, storage limits, and explicit power margins.
Required array power
310.2 W
263.7 W after degradation
Battery capacity
129.6 Wh
77.8 Wh bus energy
Orbit energy
190.0 Wh
70.0 Wh during eclipse
Peak ratio
0.68
peak load / EOL array
Orbit power balance
Solar generation must carry sunlit loads and replace battery energy before the next eclipse.
60 min sun / 35 min eclipse
End-of-life array
263.7 W
310.2 W beginning-of-life before degradation
Battery at bus
77.8 Wh
60% depth of discharge drives installed capacity
Total orbit load
190.0 Wh
90% distribution efficiency, 90% battery round trip
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