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A key concept when deciding the investment in a determined photovoltaic (PV) product is to know if it passed enough tests to ensure its good performance and its safety and durability characteristics. Testing under internationally recognized standards has some advantages. From the point of view of the designers and manufacturers, the certification obtained according to international standards allows them to test their designs against common parameters and, based on the results, to define the extent of their warranties. From the point of view of end users, the employment of certified products involves that they are reliable enough to ensure reasonable sustained performance over the years and to minimize the appearance of risks during installation and operation.