IEC 61724 PDF

March 9, Hukseflux Share The first edition of IEC Photovoltaic system performance monitoring — Guidelines for measurement, data exchange and analysis —, dates from It now has been updated. The new version of the standard is fundamentally different from the version. The new scope not only defines the measuring system components and procedures as in the version , but it also aims to keep measurement errors within specified limits. It does so by establishing accuracy classes for monitoring systems. The new standard includes: 3 accuracy classes, A, B and C, for monitoring systems, to be used in conformity declarations accuracy requirements for monitoring equipment per class required quality checks i.

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A quick explanation. The standard for PV system performance monitoring has been revised. In conformity declarations, providers must state the accuracy class of the measurement. The class is not only determined by the hardware that is used, but also by quality checks and measurement procedures. The standard contains detailed specifications at monitoring system component level.

This memo offers comments on consequences of the new standard concerning the selection of pyranometers. It shows requirements for solar radiation measurements and which pyranometers comply. Introduction The first edition of IEC Photovoltaic system performance monitoring — Guidelines for measurement, data exchange and analysis —, dates from It now has been updated. The new version of the standard is fundamentally different from the version. The new scope not only defines the measuring system components and procedures as in the version , but also aims to keep measurement errors within specified limits.

It does so by establishing accuracy classes for monitoring systems. The new standard includes: 3 accuracy classes, A, B and C, for monitoring systems, to be used in conformity declarations accuracy requirements for monitoring equipment per class required quality checks i.

It also defines cleaning and calibration intervals for pyranometers. 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. Why heating and ventilation? IEC requires pyranometer heating and ventilation for class A, and heating only for class B.

Pyranometer domes are made of glass. When facing the sky on a clear night, glass temperature tends to go below dewpoint, so that water condenses on the dome. Heating and ventilation of solar radiation sensors keeps the glass temperature above dewpoint and free from dew and frost deposition. This significantly increases the reliability of the measured data. Table 1 The main elements of the IEC monitoring classification system.

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IEC 61724 PDF

Kazirisar 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. 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. Emerainville — France T: In conformity declarations, providers must state the accuracy class of the measurement. The standard contains detailed specifications at monitoring system component level. It is no use having only one or a few instruments Class A. The standard also defines requirements for measurement of module- and air temperature, wind speed and direction, soiling ratio, and Ieec and DC current and voltage. Quick facts on the IEC standard for PV stakeholders Class A means great care idc 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.

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