Lot of photovoltaic systems are installed on agricultural land (20% in Germany) which, due to the high concentration of ammonia present in the air of the stables, affects power of the modules. That's why there are standard tests of resistance to ammonia to which the modules must be submitted to obtain the quality certification.
The two most important tests for resistance to ammonia are IEC 62716 TÜV Rheinland is DLG. Both test the resistance of photovoltaic modules to NH3 corrosion and admit / accept a maximum power loss of 5%.
How the tests take place. The tests evaluate parameters such as power loss, visual inspection and insulation resistance. In ammonia corrosion test by TÜV Rheinland modules are subjected 20 times to extreme conditions for 20 consecutive days, in addition, many are exposed to 6667 ppm ammonia (NH3), up to 8 hours at temperatures of 140 ° F (60 ° C) at 100% humidity, then at 16 hours of drying in a standard atmosphere without ammonia below 73 ° F (23 ° C) and a maximum of 75% humidity. The DLG NH3 resistance tests instead, they test the performance of the photovoltaic modules by exposing them to 750 ppm of ammonia clouds at 158 ° F (70 ° C) for 1,500 hours. This test simulates the product life span of approximately 20 years.
At the top. The best results in the two most important ammonia resistance tests (NH3) for photovoltaic modules were obtained by Canadian Solar, one of the world's leading manufacturers of solar modules. Canadian modules have been tested according to IEC 62716, ammonia corrosion project C by TÜV Rheinland and according to the DLG standards for photovoltaic modules used in agricultural environments.
Canadian Solar modules showed a minimum power loss of 0.8% in the TÜV test and less than 1.3% in the DLG tests. Canadian modules thus passed both tests without any performance degradation being recorded. TUV Rheinland has certified the modules of Canadian Solar CS6P-P and CS6P-M, CS5A-M and CS5A-P, CS6X-P and CS6X-M, CS6A-P and CS6A-M, CS5P-M and CS5P-P, CS6C -M, CS6C-P and CS5C-M while the DLG modules CS6P-P.
In light of the results, Shawn Qu, Canadian Solar Chairman and CEO, commented: “We are proud of our Research and Development division and our innovations, so we can offer excellent photovoltaic modules to customers and partners. The ammonia resistance tests are the last in order of time to have emphasized the suitability of our modules in real applications both in Germany and in the rest of the world ".