Advanced performance calculators and analytics tools designed for solar professionals. Monitor CUF, PR, specific yield, and more with industry-leading accuracy.
Calculation methodology documented on GitHub — formulas, variable definitions, and IEC 61724-1 references.
Engineering-grade calculators for solar power plant performance monitoring and O&M reporting.
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Calculation logic reflects real PPA reporting and MIS requirements — not textbook theory.
All calculations run locally in your browser. No plant data, energy figures, or inputs are processed on any server.
Developed by someone who has hands-on experience in solar plant operations and maintenance.
Practical guides and analysis for solar plant performance and O&M engineering.
Real 15-minute interval field data from a 15 MWp plant shows how afternoon shading silently drops daily PR by 1.08 percentage points and cuts 1.39% of daily generation.
Read Full ArticleCommon questions about solar plant performance metrics and our calculators.
Performance Ratio (PR) naturally drops in summer because module temperatures rise significantly above the 25°C Standard Test Conditions (STC) reference. Most crystalline silicon modules lose about 0.35–0.45% efficiency per °C above 25°C, so a cell temperature of 55°C can reduce output by 10–13%. This is expected thermal behavior — not a fault. Use Temperature Corrected PR for a fairer comparison across seasons.
Always use POA (Plane of Array) insolation for accurate PR calculation. GHI (Global Horizontal Irradiance) measures sunlight on a flat horizontal surface, but your PV modules are tilted. POA represents the actual irradiance hitting the module surface and is the standard required by IEC 61724-1. Using GHI instead of POA can skew your PR by 5–15% depending on tilt and latitude.
POA (Plane of Array) insolation is the total solar irradiance falling on the tilted surface of your PV modules, measured in kWh/m². It combines three components: direct beam, diffuse sky, and ground-reflected (albedo) radiation. POA matters because it represents the actual energy resource your panels can convert — not the theoretical horizontal value. Every meaningful performance metric (PR, specific yield, energy yield) depends on accurate POA measurement.
Our calculators implement formulas directly from IEC 61724-1:2021 and MNRE guidelines — the same standards used in commercial PV monitoring software. Computational accuracy is exact (limited only by your input precision). Real-world accuracy depends on your data quality: calibrated sensors, proper POA measurement, and clean inverter readings. Core formulas and references are documented on our GitHub repository, with more being added over time.
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