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 scope not only defines the measuring system components and procedures as in the versionbut also aims to keep measurement errors within specified limits. Class A high accuracy. The version of the standard recognises that the solar irradiance measurement is one of the weakest links jec the measurement chain.
Why heating and ventilation?
Photovoltaic system performance monitoring — Guidelines for measurement, data exchange and analysis —dates from At least once per week. You should at least do all of the below: Pyranometer domes are made of glass.
This significantly increases the reliability of the measured data. It does so by establishing accuracy classes for monitoring systems. The following tables offer an overview of the main elements of the IEC monitoring classification 6724, its requirements for solar radiation measurement and which pyranometers comply in which accuracy class. It shows requirements for solar radiation measurements and which pyranometers comply.
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.
Quick facts on the IEC 61724-1 standard for PV stakeholders
Class C basic accuracy. It now has been updated.
Figure 1 frost and dew deposition: Both standards define Class A, B and C but with a different meaning. Delft – The Netherlands T: There are two reasons for the extra steps prescribed by IEC to comply with an optimal Class A: 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.
Emerainville – France T: 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 addresses sensors, installation, and accuracy for monitoring 61742 in addition to measured parameter data acquisition and quality checks, calculated parameters, and performance metrics.
The IEC standard for PV monitoring systems. A quick explanation. | Hukseflux
You should at least do all of the below:. It also defines cleaning and calibration intervals for pyranometers. Heating and ventilation of solar radiation sensors keeps the glass temperature above dewpoint and free from dew and frost deposition.
The first edition of IEC It is too costly to obtain a Class A status:. In conformity declarations, providers must state the accuracy class of the measurement. 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. To achieve this, dew, frost, soiling and instrument deposition as such should be prevented, and customers have to do good product maintenance.
This memo offers comments on consequences of the new standard concerning the selection of pyranometers.
IEC 61724-1: what’s it all about?
The class is not only determined by the hardware that is used, but also by quality checks and measurement procedures. Once every 2 years. Introduction The first edition of IEC It is too costly to obtain a Class A status: Class B medium accuracy. It outlines equipment, methods, and terminology for performance monitoring and analysis of photovoltaic PV systems. When facing the sky on a clear night, glass temperature tends to go below dewpoint, so that water condenses on the dome.
Quick facts on the IEC standard for PV stakeholders – Kipp & Zonen
It is no use having only one or a few instruments Class A. For pyranometers, the following costs are associated with Class A: The standard contains detailed specifications at monitoring system component level. The new standard includes: