Free Online Specific Yield & Performance Metrics Calculator
This free online solar specific yield calculator helps you assess how efficiently your solar plant is performing by calculating three key metrics: Specific Yield (kWh/kWp/day), Reference Yield (Peak Sun hours/day), and the Performance Target Index (PTI range 0-1.5).
Steps to Use Our Free Solar Performance Metrics Tool
- Enter Energy Generated: Provide the total energy produced in kilowatt-hours (kWh) for the analysis period.
- Enter Plant Capacity: Input the installed capacity of the plant in kilowatts (kW).
- Insolation POA: Add the measured plane-of-array insolation (sunlight received) in kWh/m² during the same time period.
- Anticipated PR (%): Provide the expected performance ratio for your plant. This typically ranges between 65%–85%.
- Number of Days: Insert the total number of days over which the energy generation and insolation data were recorded.
-
Irradiance @ STC: Standard test condition
irradiance, by default sets to
1 kWh/m²by this calculator. -
Submit the form to calculate:
- Specific Yield The amount of energy generated per kilowatt per day of installed capacity over the number of days specified.
- Reference Yield Equivalent peak sun hours per day based on total solar irradiation over a specified period.
-
Performance Target Index: PTI typically
ranges from 0 (poor performance) to 1.5 (unrealistically
high performance).
PTI < 1 → Lower than expected performance
PTI > 1 → Better than expected performance
These metrics enable clearer performance benchmarking, early issue detection, and optimization of solar energy systems over time.