Power Source Components
Internal Power | Processed Power | Solar Array
| Power Source | Description |
|---|---|
| Internal Power | Power generated internally. |
| Processed Power | Power available from a power processing unit (PPU). |
| Solar Array Power | Power generated by a solar array. |
Internal Power Source
For an internal power source, set the following parameters:
Internal Power Source User-Definable Attributes
| Attribute | Description |
|---|---|
| GeneratedPower | Power generated by the spacecraft from internal sources. |
| PercentDegradationPerYear | Degradation factor is (1 - x%/yr)timeSinceRefEpoch |
| ReferenceEpoch | Date and time used as a reference epoch for degradation. |
Processed Power Source
For a processed power source, set the following parameters:
Processed Power Source User-Definable Attributes
| Attribute | Description |
|---|---|
| Efficiency | Efficiency of the PPU unit. |
| InputPowerSource | Source of power available to the PPU. |
| Load | Power diverted from the power source and unavailable to the PPU. |
Solar Array Power Source
The Solar Array Power Source calculates one parameter, Power:
Where Fth is the Thermal Model Factor described below, D is the degradation factor described below (measured from the reference epoch), CE% is CellEfficiencyPct, AE% is ArrayEfficiencyPct, and ISL is the angle InclinationToSunLine. Flux is defined as:
where Fau is the solar flux at 1 au (from the central body file), and Rs is the apparent distance to the sun.
Solar Array Power Source User-Definable Attributes
| Attribute | Description |
|---|---|
| Area | Solar array panel area. |
| Concentration | Solar array concentration factor. |
| CellEfficiencyPct | Cell efficiency in producing output power from incident sunlight. |
| ArrayEfficiencyPct | Array efficiency in producing output power from a collection of cells. |
| PercentDegradationPerYear | The degradation factor is (1 - x)n, where n is the time since epoch in years, and x is the percent degradation per year. |
| ReferenceEpoch | Date and time used as a reference epoch for degradation. |
| InclinationToSunLine | Angle from the panel normal vector to the apparent sun line. |
Thermal Model Attributes
The Thermal factor can be calculated as a function of the distance (in AU) to the Sun:
where r is the magnitude of the radius vector in AU.
| Coefficient | Description |
|---|---|
| ThermalModel.C0 | C0 coefficient. |
| ThermalModel.C1 | C1 coefficient. |
| ThermalModel.C2 | C2 coefficient. |
| ThermalModel.C3 | C3 coefficient. |
| ThermalModel.C4 | C4 coefficient. |
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