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IS 16302:2016 is the Indian Standard (BIS) for photovoltaic (pv) systems - evaluation of performance. This standard specifies the procedure for measuring and analyzing the energy performance of grid-connected photovoltaic (PV) systems. It defines key metrics like Performance Ratio (PR) and system yields, and details the requirements for instrumentation, data acquisition, and reporting to verify a plant's operational efficiency.
Specifies methods for evaluating and reporting the energy performance of photovoltaic (PV) systems, including measurement and data analysis.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! Accurate PR calculation heavily depends on correct data filtering to exclude periods of grid outage, inverter downtime, or sensor malfunction.
! Soiling on pyranometers and PV modules is a major source of error; regular cleaning and maintenance of sensors are critical for reliable data.
! Ensure the 'as-built' peak power (P_peak) of the array is accurately determined and used for calculations, as it can differ from the sum of module nameplate ratings.
Photovoltaic system performance - Part 1: Monitoring
Defines equipment, methods, and terminology for performance monitoring and analysis of PV systems.
ASTM E2848 - 13(2018)ASTM International (US)
HighCurrent
Standard Test Method for Reporting Photovoltaic Non-Concentrator System Performance
Provides procedures for monitoring, collecting data, and reporting the energy performance of PV systems.
IEC TS 61724-3:2016IEC (International)
MediumCurrent
Photovoltaic system performance - Part 3: Energy evaluation method
Focuses on predicting a PV system's energy generation, which complements the post-construction evaluation.
Key Differences
≠IEC 61724-1:2021 introduces a formal tiered classification for monitoring systems (Class A, B, C) based on sensor accuracy and data acquisition rates, which dictates the overall uncertainty. IS 16302:2016 specifies monitoring requirements but lacks this explicit multi-level classification system.
≠IS 16302:2016 prominently features the Capacity Utilization Factor (CUF) as a key performance metric. The primary international equivalent, IEC 61724-1, does not define CUF, focusing instead on Performance Ratio (PR) and normalized yields, as CUF is often considered a more utility-specific financial metric.
≠IEC 61724-1 places a stronger emphasis on detailed procedures for data filtering, quality checking, and specific corrections for factors like soiling, while IS 16302 acknowledges the need for quality data but is less prescriptive on the specific algorithms and correction methodologies to be applied.
≠The current IEC standard (IEC 61724-1:2021) requires a formal uncertainty analysis for all calculated performance metrics. IS 16302:2016 does not explicitly mandate a comprehensive uncertainty budget, focusing more on the direct calculation of parameters based on sensor readings with specified accuracies.
Key Similarities
≈Both standards use the Performance Ratio (PR) as the fundamental, weather-normalized metric for comparing the performance of different PV systems. The core formula, comparing actual energy output to a theoretical reference output based on irradiation, is identical.
≈The set of essential parameters to be monitored is the same in both standards, including in-plane solar irradiance, ambient temperature, PV module temperature, and AC energy output.
≈Both IS 16302 and its international counterparts share the same primary objective: to establish a standardized framework for the evaluation of a grid-connected PV system's performance after commissioning.
≈Both standards utilize the concept of 'Yields' (e.g., Final Yield Yf, Reference Yield Yr) to normalize system performance against its rated capacity and available solar resource, allowing for comparison across different system sizes and locations.
Parameter Comparison
Parameter
IS Value
International
Source
Primary Performance Metric
Performance Ratio (PR) and Capacity Utilization Factor (CUF)
Performance Ratio (PR)
IEC 61724-1:2021
Irradiance Sensor Requirement
Pyranometer of 'Secondary Standard' or 'First Class' as per ISO 9060.
Class A monitoring requires 'Secondary Standard'; Class B requires 'First Class'.
IEC 61724-1:2021
Module Temperature Sensor Accuracy
± 1 °C
± 1 K (for highest accuracy Class A monitoring)
IEC 61724-1:2021
Reference Irradiance for PR Calculation
1000 W/m²
1000 W/m² (G_STC)
IEC 61724-1:2021
Data Averaging Interval
Recommended 15 minutes
1 to 60 minutes, depending on monitoring class (e.g., 1 min for Class A, 10 min for Class B)
IEC 61724-1:2021
Wind Speed Monitoring
Required for systems >100 kWp, sensor at a height of 2m.
Required for Class A and B monitoring, recommended at hub height or 10m.
IEC 61724-1:2021
⚠ Verify details from original standards before use
Key Values5
Quick Reference Values
Standard Test Condition (STC) Irradiance1000 W/m²
Standard Test Condition (STC) Cell Temperature25 °C
Standard Test Condition (STC) Air MassAM 1.5
Recommended Data Acquisition Interval≤ 15 minutes
Typical Target Performance Ratio (PR) Range75% to 85%
Key Formulas
PR = Yf / Yr — Performance Ratio, where Yf is Final Yield and Yr is Reference Yield
Yf = E_AC / P_peak — Final PV System Yield (kWh/kWp)
Yr = H_t / G_ref — Reference Yield (h)
Lc = Yr - Ya — Array Capture Losses
Ls = Ya - Yf — System (BOS) Losses
Tables & Referenced Sections
Key Tables
Table 1 - Required Measured Parameters for Performance Monitoring
Table B.1 - Typical Sources of Uncertainty in Performance Evaluation
Key Clauses
Clause 5 - Terms and Definitions (Performance Ratio, Yields)
Clause 6 - Performance Evaluation Procedure
Clause 7 - Data Acquisition and System Documentation
Annex A - Calculation of Performance Ratio and System Losses
To provide a standardized methodology for evaluating the energy performance of a grid-connected PV system, primarily by calculating the Performance Ratio (PR).
What is Performance Ratio (PR)?+
PR is the ratio of the final (actual) AC energy yield to the reference (ideal) yield. It quantifies the overall effect of system losses on the rated output. (Clause 5.4)
What are the minimum instruments required for performance evaluation?+
A pyranometer (or reference cell) for solar irradiance, an energy meter for AC energy output, and temperature sensors for module and ambient temperature. (Clause 7, Table 1)
What is the difference between Array Yield (Ya) and Final Yield (Yf)?+
Array Yield (Ya) is the DC energy output per kWp of the array, while Final Yield (Yf) is the AC energy output per kWp delivered to the grid. The difference represents Balance-of-System (BOS) losses. (Clause 5.6, 5.7)