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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The new version of the standard is fundamentally different from the version. Figure 1 frost and dew deposition: At least once per week. It also defines cleaning and calibration intervals for pyranometers.
It addresses sensors, installation, and accuracy for monitoring equipment in addition to measured parameter data acquisition and quality checks, calculated parameters, and performance metrics. Class C basic accuracy. Emerainville 6172 France T: The class is not only determined by the hardware that is used, but also by quality checks and measurement procedures.
Lec new scope not only defines the measuring system components and procedures as in the versionbut also aims to keep measurement errors within specified limits.
Once every 2 years. 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.
You should at least do all of the below:. It shows requirements for solar radiation measurements and which pyranometers comply.
It is no use having only one or a few instruments Class A. Photovoltaic system performance monitoring — Guidelines for measurement, data exchange and analysis —dates from The standard for PV system performance monitoring has been revised.
Heating and ventilation of solar radiation sensors keeps the glass temperature above dewpoint and free from dew and frost deposition. In conformity declarations, providers must state the accuracy class of the 6172. Introduction The first edition of IEC Delft – The Netherlands T: It ief so by establishing accuracy classes for monitoring systems. This significantly increases the reliability of the measured data.
You should at least do all of the below: The new standard includes: Both standards define Class A, B and C but with a different meaning.
IEC 61724-1: what’s it all about?
For pyranometers, the following costs are associated with Class A: 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.
Pyranometer domes are 6124 of glass. The solution with true air ventilation, not air circulation. It now has been updated. It outlines equipment, methods, and terminology for performance monitoring and analysis of photovoltaic PV systems.
The IEC standard for PV monitoring systems. A quick explanation. | Hukseflux
Why heating and ventilation? 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 is too costly to obtain a Class A status:. 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.
Quick facts on the IEC 61724-1 standard for PV stakeholders
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. It is too costly to obtain a Class A status: The first ieec of IEC The version of the standard recognises that the solar irradiance measurement is one of the weakest links in the measurement chain.
When facing the sky on a clear night, glass temperature tends to go below dewpoint, so that water condenses on the dome. To achieve this, dew, frost, soiling and instrument deposition as such should be prevented, and customers have to do good product maintenance.
Class B medium accuracy. Class A high accuracy.