Satellite Eclipse Battery DOD Calculator
Spacecraft power systems: Calculate orbital shadow eclipse duration ($t_{\text{ecl}}$), required lithium-ion battery capacity (Ah and Wh), Depth-of-Discharge (DOD), and mission lifetime cycle degradation.
Orbit & Eclipse Geometry
LEO: ~500 km; GEO: 35,786 km
0° = Maximum eclipse; >70° = Full sun
Electrical Load & Bus Parameters
Average power drawn during night
CubeSat: 8.4V; SmallSat: 28V; High-power: 100V
LEO standard: 20–30%; GEO: 70–80%
Wiring and converter losses
Battery Sizing & Mission Cycling
Required Battery Capacity:
--
Ampere-hours (Ah)
Nameplate Energy Storage:
--
Watt-hours (Wh)
Max Eclipse Duration t_ecl:
--
minutes in shadow
Estimated Battery Mass:
--
kg (Li-ion ~140 Wh/kg)
| Orbital Period T_orb: | -- |
| Eclipse Fraction of Orbit: | -- |
| Total Lifetime Charge-Discharge Cycles: | -- |
| Battery Cell Technology Suitability: | -- |
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