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New standards to determine the actual performance of solar panels.

IEC 61853 is a series of standards that provide a method for assessing solar panel performance based on power (W), energy (Wh) and performance ratio. It is written to be used for all kinds of solar panels (solar cell modules), regardless of the technology they are based on.

The first part, IEC 61853-1, shows how to assess the effect with regard to irradiation and temperature, and the second part describes the influence of more local conditions, such as wind speed and the angle of incidence of the solar radiation. These parts have been around for a few years. Now the new parts,  SS-EN IEC 61853-3  and  SS-EN IEC 61853-4 , have been completed and in March established as Swedish standard. The fourth part contains climate data which, together with the information in the two previous parts, is used for the calculation of the solar panel's energy performance as described in part three.

The standard gives as a final result a parameter called "Climate Specific Energy Rating" (CSER). It can be used when comparing different types of solar panels and to describe how a certain type of panel behaves under different climatic conditions. In this way, the standard can both support manufacturers in the development of new products and help in the selection of the type of panels that are most suitable for a particular location.

The purpose of the standard is thus to provide a method for determining a performance ratio, that is, a value of the relationship between the actual electricity production under given circumstances and what is apparent from standard, standardised tests in the laboratory. The standard can therefore also be used to predict the electricity production from a solar cell installation.

Although the method in the standard is technology independent, it may be less suitable for products with properties that show no clear nonlinearity or which are based on technology that causes performance to be impaired by the influence of light or heat. Part two of the standard has been criticised for being unnecessarily cumbersome and work on a supplementary simplified method is ongoing.

IEC 61853 is developed as an international standard in the technical committee "Solar photovoltaic energy systems", IEC TC 82, within IEC, the international standardisation organisation for electronics and electrical engineering. It has also been adopted as a European standard, EN, and has been established as a Swedish standard by SEK Svensk Elstandard, one of the three Swedish standardisation organisations. It is also through SEK Svensk Elstandard, www.elstandard.se , that Swedish companies, authorities, colleges and organisations are welcome to participate and contribute to the work.

With SEK preview you can freely download foreword, any introduction, table of contents and the section with purpose and scope. What is not visible in the preview, however, is that this standard, in particular part three, requires some mathematical knowledge.

See preview here on SS-EN 61853-1, Solar cell modules - Performance testing and rating of rating - Part 1: Measurement of performance with respect to irradiance and temperature and indication of power

See preview here on SS-EN 61853-2, Solar cell modules - Testing of performance and indication of rated values ​​- Part 2: Measurement of spectral responsiveness, angle of incidence and module operating temperature

See preview here on SS-EN IEC 61853-3, Solar cell modules - Performance testing and rating of rating - Part 3: Determination of energy performance

See preview here on SS-EN IEC 61853-4, Solar cell modules - Testing of performance and specification of rating - Part 4: Climate profiles for reference purposes

To mark that the standard has been developed in a worldwide collaboration in IEC, the new parts that seem to have been named SS-EN IEC.

Design and type approval of solar cell modules is described in SS-EN 61215 and the requirements for labeling and documentation are found in SS-EN 50380.

The corresponding standard for determining the performance of solar cells is SS-EN 60904, also it is developed within the IEC TC 82. There is also a project in place to lay the foundation for measurements on new types of solar cells, ie organic solar cells, dye solids or perovskitsol cells, see here .

See  here for more information about the work in SEK TK 82 and IEC TC 82, or contact SEK at snc@elstandard.se , to find out more about how to participate and write the standards.

#renewableenergy #utilities

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