Definition
PR Calculation Methodology refers to the formal procedure for computing Performance Ratio per IEC 61724-1:2021. Two main forms: standard PR (Y_f / Y_r) and temperature-corrected PR (TC-PR) that normalizes for cell temperature.
Key Takeaways
- PR Calc per IEC 61724-1 = Y_f / Y_r.
- Temperature-corrected PR (TC-PR) removes seasonal variation.
- Standard PR for monthly reporting; TC-PR for audits.
- Always specify methodology when reporting (IEC, ASTM, NREL).
- See Performance Ratio for full treatment.
Frequently Asked Questions
3 commonly searched questions about PR Calculation Methodology.
What's the standard PR formula?
PR = Y_f / Y_r = (AC_energy / kWp) / (POA × duration / 1 kW/m²). Dimensionless ratio of actual to theoretical max.
What's TC-PR?
Temperature-corrected PR. Removes seasonal temperature variation by normalizing to 25°C cell temperature: Y_r is adjusted by (1 + γ_Pmp × (T_cell − 25)).
When is TC-PR used?
For ongoing performance audits and dispute resolution. Standard PR for monthly operational reporting.
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