IEC 61724 PDF

The standard for PV system performance monitoring has been revised. The new version, released February , defines “accuracy classes”. Abstract — After a PV system is installed, periodic analysis is necessary to track how measured performance meets expectations. IEC outlines methods . The IEC standard for PV system performance monitoring has been revised. This is relevant for system owners, O&M managers.

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At least once per week.

The new scope not only defines the measuring system components and procedures as in the versionbut also aims to keep measurement errors within specified limits. Class B medium accuracy. It is no use having only one or a few instruments Class A.

It outlines equipment, methods, and terminology for performance monitoring and analysis of photovoltaic PV systems. The solution with true air ventilation, not air circulation. Figure 1 frost and dew deposition: It is too costly to obtain a Class A status:.

Class A means great care for the maintenance of your pyranometers A survey showed that the main reason for most companies not to aim for a Class A status for IEC, is the cost-benefit analysis they made. There are two reasons for the extra steps prescribed by IEC to comply with an optimal Class A: The standard contains detailed specifications at monitoring system component level.


The standard also defines requirements for measurement of module- and air temperature, wind speed and direction, soiling ratio, and AC and DC current and voltage.

Quick facts on the IEC standard for PV stakeholders – Kipp & Zonen

The new version of the standard is fundamentally different from the version. Delft – The Netherlands T: It now has been updated.

This significantly increases the reliability of the measured data. The version of the standard recognises that the solar irradiance measurement is one of the weakest links in the measurement chain.

The classes A, B and C are site requirements; all individual onsite measurement instruments have to be Class A, in order to obtain a Class A status of the site.

IEC 61724-1: what’s it all about?

It addresses sensors, installation, and accuracy for monitoring equipment in addition to measured parameter data acquisition and quality checks, calculated parameters, and performance metrics.

You should at least do all of the below: It does so by establishing accuracy classes for monitoring systems. Photovoltaic system performance monitoring — Guidelines for measurement, data exchange and analysis —dates from It also defines cleaning and calibration intervals for pyranometers.


Once every 2 years. The standard for PV system performance monitoring has been revised.

Quick facts on the IEC 61724-1 standard for PV stakeholders

The following tables offer an overview of the main elements of the IEC monitoring classification system, its requirements for solar radiation measurement and which pyranometers comply in which accuracy class. Introduction The first edition of IEC It specifies for each class of monitoring system the pyranometer class that must be used, including required instrument ventilation and heating, azimuth and tilt angle accuracy.

It shows requirements for solar radiation measurements and which pyranometers comply. Class A high accuracy. Oec is too costly to obtain a Class A status: The first edition of IEC When facing the sky on a clear night, glass temperature tends to go below dewpoint, so that water condenses on the dome.

Class C basic accuracy.

Both standards define Class A, B and C but with a different meaning. The class is not only determined by the hardware that is used, but also by quality checks and measurement procedures. Emerainville – France T: Pyranometer domes are made of glass.