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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The standard contains detailed specifications at monitoring system component level. Once every 2 years.
Class A high accuracy. Delft – The Netherlands T: 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.
It addresses sensors, installation, and accuracy for monitoring equipment in addition to measured parameter data acquisition and quality checks, calculated parameters, and performance metrics.
It shows requirements for solar radiation measurements and which pyranometers comply. Class B medium accuracy. It does so by establishing accuracy classes for monitoring systems. The first edition of IEC You should at least do all of the below:. Heating and ventilation of solar radiation sensors keeps the glass temperature above dewpoint and free from dew and frost deposition.
At ice once per week. It is too costly to obtain a Class A status:. Both standards define Class A, B and C but irc a different meaning. Photovoltaic system performance monitoring — Guidelines for measurement, data exchange and analysis —dates from The solution with true air ventilation, not air circulation. There are two reasons for the extra steps prescribed by IEC to comply with an optimal Class A: The new standard includes: This memo offers comments on consequences of the new standard concerning the selection of pyranometers.
Class C basic accuracy.
Quick facts on the IEC standard for PV stakeholders – Kipp & Zonen
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 irc analysis they made. 61742 should at least do all of the below: Figure 1 frost and dew deposition: 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.
Why heating and ventilation? This significantly increases the reliability of the measured data.
IEC 61724-1: what’s it all about?
It also defines cleaning and calibration intervals for pyranometers. The class is not only determined by the hardware that is used, but also by quality checks and measurement procedures.
Introduction The first edition of IEC It specifies for each class kec monitoring system the pyranometer class that must be used, including required instrument ventilation and heating, azimuth and tilt angle accuracy. 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. It now has been updated.
When facing the sky on a clear night, glass temperature tends to go below dewpoint, so that water condenses on the dome. In conformity declarations, providers must state ied accuracy class of the measurement.
Emerainville – France T: It is too costly to obtain a Class A status: Pyranometer domes are made of glass. The version of the standard recognises that the solar irradiance measurement is one of the weakest links in the measurement chain. The standard for PV system performance monitoring has been revised. The new 6172 not only defines the measuring system components and procedures as in the versionbut also aims to keep measurement errors within specified limits.
To achieve this, dew, frost, soiling and instrument deposition as such should be prevented, and customers have to do good product maintenance. For pyranometers, the following costs are associated with Class A: