In the second half of this year, the problem of PV module power false label came back, and the power of the same module product measured by different agencies was quite different, which triggered a heated debate, and the resulting claims also occurred from time to time.
On October 24, the China Photovoltaic Association issued a notice on the collection of signatories to the Convention on Integrity Calibration and Traceability Self-Discipline of Photovoltaic Module Power Standards, requiring signatories to voluntarily join and consciously abide by the Convention, strictly exercise self-discipline and accept supervision .
the 531 New Deal in 2018, the industry stimulated by high subsidies was mixed, and many businesses sold low-power components directly as high-power components. In 2016, a screenshot was circulated in the photovoltaic circle. The person on the picture directly asked to produce components according to 80 W power, but asked for 150 W, 18V parameters and size. In the case No.1239 of Lu 1481 at the beginning of the Republic of China in the
same year (2017), among 243 250 W photovoltaic panels purchased by Yuhao Photovoltaic Company, the output power of live operation was only 140-160 W per panel. The lowest power is even only 125.
Since then, with the continuous progress of detection methods, the market has been overwhelmed, and this bright false label behavior has gradually disappeared, replaced by a more covert way. During the production of the
module, there is a certain deviation between the actual power and the nominal power due to the different production conditions and detection methods. About 2% -3% , when the component power is generally not high, the difference in this range has little impact on the whole system, said Ji Zhenshuang, deputy director of Jianheng Certification Center. The technical term should be " uncertainty of measurement" .
At a time when component power is generally above 500 W, "inaccurate measurement" may cause the power of each component to be as high as 15 W. If it is the flagship series products of the current manufacturer above 700 W, the power difference on each component will be even greater.
In the process of data inquiry, digital new energy DataBM.
Industry insiders said that the phenomenon of component power difference is related to the large number of market testing institutions and the lack of timely unification of standards. In the PERC era, because of the mature development of the industry, the testing institutions often match the standards, and the power error can be controlled at the level of 2 W and 3 W, and the virtual label space is small.
With the change of technology, N-type components are gradually replacing P-type components to become a new generation of mainstream products, but the testing standards of components have not yet been unified, and the standards of tripartite testing institutions are also different , so it is inevitable that a component will measure a variety of powers.
This has also become the basis for some manufacturers to make profits.
Since last year, new entrants attracted by the heat of the photovoltaic industry have flocked in, which has also triggered fierce competition in the module industry and frequent price wars. Up to the time of publication, the price of components has fallen below the 1 yuan/W mark, breaking through the cost line of many enterprises. In this case, "cost is king" has gradually become the only way for enterprises to survive.
At the same time, enterprises have been claimed by European customers because of the false label of component power.
In addition, in this interest chain, digital new energy DataBM.
At present, the main domestic component power evaluation and certification agencies are T TÜV Rhine, T TÜV North Germany, T TÜV South Germany, etc. Among them, T TÜV North Germany's photovoltaic module business opened the latest. Its market share is also lower than that of T TÜV Rheinland and T TÜV South Germany. A research institution
once sent four N-type components to four testing institutions, including T TÜV Rhine, T TÜV North Germany and T TÜV South Germany, and the results showed that the power of T TÜV North Germany was generally high. Where the difference is up to 7.
At present, the chaos in the component industry is not only the false label of components, but also the report that an enterprise was forced to expose its rights to the circle of friends because of the problem of component cracking.
In the self-discipline convention drafted by the industry, digital new energy DataBM.
As of November 21, 40 enterprises have made self-discipline commitments. In the future, there will be less and less room for bad businessmen to drill, forcing enterprises to return to technological innovation.
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