| Timestamp | yyyy-MM-dd HH:mm:ss | Date and time for the calculation timestep |
| Solar Zenith Angle | ° | Angle between the sun and the vertical (zenith), where 0° is directly overhead and 90° is at the horizon |
| Solar Azimuth Angle | ° | Compass direction of the sun measured clockwise from north |
| Sunrise | — | Boolean or time indicating sunrise occurrence for the timestep |
| Sunset | — | Boolean or time indicating sunset occurrence for the timestep |
| Modelled Extraterrestrial DNI | W/m² | Direct normal irradiance at the top of the atmosphere, calculated from solar geometry and the solar constant |
| GHI | W/m² | Global horizontal irradiance from the weather data source |
| DHI | W/m² | Diffuse horizontal irradiance, either from weather data or calculated via decomposition model |
| DNI | W/m² | Direct normal irradiance, either from weather data or calculated via decomposition model |
| BHI | W/m² | Beam horizontal irradiance, calculated as DNI × cos(zenith angle) |
| Clear Sky GHI | W/m² | Modeled clear sky global horizontal irradiance from the Bird clear sky model |
| Clear Sky DNI | W/m² | Modeled clear sky direct normal irradiance from the Bird clear sky model |
| Clear Sky DHI | W/m² | Modeled clear sky diffuse horizontal irradiance from the Bird clear sky model |
| POAI | W/m² | Representative plane-of-array irradiance at the system level, typically a capacity-weighted average |
| Ambient Temperature | °C | Ambient air temperature from the weather data source |
| Relative Humidity | % | Relative humidity from the weather data source |
| Precipitable Water | cm | Precipitable water content in the atmospheric column, used for spectral calculations |
| Windspeed | m/s | Wind speed from the weather data source, used for module temperature calculations |
| Wind Direction | ° | Wind direction from the weather data source, measured clockwise from north |
| Rainfall | mm | Precipitation amount from the weather data source |
| Pressure Corrected Air Mass | — | Optical air mass corrected for site elevation and atmospheric pressure |
| Spectral Shift | — | Spectral correction factor applied at the system level to account for atmospheric spectral variations |
| Module Surface Temperature | °C | Representative module surface temperature at the system level |
| HV Transformer and Transmission Line Input | W | Total AC power entering the HV transformer and transmission line system from all blocks |
| AC Power Lost due to HV Transformer(s) | W | Total power losses in all HV transformers at the plant level |
| AC Power Lost due to Transmission Line(s) | W | Total power losses in transmission lines between HV transformers and the point of interconnection |
| Transformer and Transmission Line Output | W | AC power after HV transformer and transmission line losses |
| AC Power after Availability | W | AC power after applying plant availability losses |
| Plant Output Limit | W | Configured maximum plant output limit at the point of interconnection, or N/A if no limit is set |
| AC Power Lost due to Plant Output Limit | W | Power curtailed due to plant output limit constraints |
| System Power Output | W | Final AC power output at the point of interconnection after all losses and curtailment |
| Plant Power Generated | W | Total gross AC power generated by the plant before any consumption or curtailment |
| Plant Power Consumed | W | Total auxiliary power consumed by the plant, including tracking motors, cooling, and monitoring systems |
