What is instantaneous PR in solar?

Instantaneous PR = (AC Power / (DC Capacity * Irradiance / STC)) * 100, measuring real-time efficiency.

How to calculate instantaneous PR?

Use AC power, DC capacity, and irradiance; our tool normalizes to STC (1000 W/m²).

Yes, free online with local calculations—no data collection.

Follow these steps to calculate the instantaneous Performance Ratio (PR) of your solar plant:

Enter AC Power (kW): Input the real-time instantaneous AC power output from your inverter.
Enter Plant DC Capacity (kW): Provide the rated DC capacity of your solar plant.
Enter Irradiance (W/m²): Use a pyranometer or real-time sensor data to input instantaneous solar irradiance.
Irradiance @ STC (W/m²): This is typically 1000 W/m² and this calculator takes it by default.
Click Submit: Your instantaneous PR percentage will appear in the result field.

This tool helps you assess the live instantaneous efficiency of your solar plant in real-time conditions.