Derating factor

The Derating Factor (DF) is a critical coefficient in solar power systems, integrating multiple efficiencies and loss factors into a single value to adjust the theoretical output of solar panels to a more realistic estimate.

Calculation

$DF = SPE \times IE \times (1 - SL) \times CCE \times BCDE \times (1 - ML)$

Where:

• SPE (Solar Panel Efficiency)
• IE (Inverter Efficiency)
• SL (System Losses)
• CCE (Charge Controller Efficiency)
• BCDE (Battery Charge and Discharge Efficiency)
• ML (Miscellaneous Losses)

Note: The Derating Factor (DF) is sensitive to the specific operation mode of your solar power system. The presence of a battery storage solution or the decision to export energy to the grid can influence the calculation of the DF. Please consider the mode of operation when applying the DF to ensure the most accurate energy output estimation.

Application

The Derating Factor is applied to various stages of the energy flow model to ensure that calculations reflect real-world conditions and potential inefficiencies in the system.