Performance Ratio Calculator

Calculate and analyze solar PV system performance ratio (PR) - the industry standard metric for system quality.

Calculation Method

System Size (kWp DC) Nameplate DC capacity (STC)

Period

Actual Energy Output (kWh) Measured AC energy produced

Irradiation (kWh/m2) Total plane-of-array irradiation

System Type (for benchmarking)

Performance Analysis

Performance Ratio (PR)

Energy Analysis

Theoretical Yield -

Actual Yield -

Energy Loss -

Specific Yield -

Benchmarking

Industry Benchmark -

Performance vs Benchmark -

Rating -

Loss Breakdown

Temperature -

Soiling -

Shading -

Mismatch -

Wiring -

Inverter -

Other -

Total Losses -

Performance Ratio Formula


                        PR = Actual Output (kWh) / Theoretical Output (kWh)


                        Theoretical = System Size (kWp) x Irradiation (kWh/m2)

                        Specific Yield = Actual Output / System Size (kWh/kWp)

PR Benchmarks by System Type

System Type	Typical PR	Good PR
Residential Roof	75-80%	> 80%
Commercial Roof	78-82%	> 82%
Ground Fixed	80-84%	> 84%
Ground Tracker	82-86%	> 86%
Carport	76-80%	> 80%