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.
IGBT failure in solar central inverters progresses through three degradation stages: silent efficiency decline, thermal derating events, and hard failure. Each stage has a measurable impact on inverter efficiency, Performance Ratio (PR), and Capacity Utilization Factor (CUF). Field evidence and SCADA data signals reveal what to look for before the inverter trips.
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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