How much RMB 1800 yen science | photovoltaic module definition and calculation formula of attenuation rate

Editor's note: attenuation mainly because of photovoltaic modules in a test under the most greatly the output power and the ratio of initial maximum output power put into production, the main calculation listed below.

【 Photovoltaic modules attenuation definition 】

photovoltaic modules attenuation refers to the photovoltaic modules run after a period of time, under the condition of standard test ( AM1。 5, the component temperature 25 & deg; C, irradiance 1000 w/m2) Maximum output power and the ratio of initial maximum output power put into production.

【 Photovoltaic modules determine the attenuation of 】

photovoltaic modules can be used to determine the attenuation rate accelerated aging test method, field than validation method or other effective methods. Accelerated aging test method is the use of environmental test chamber to simulate outdoor actual runtime irradiance, temperature, humidity and other environmental conditions, and the related parameters for double or strict control, in order to realize the short period of time to accelerate the purpose of the component aging decay. Accelerated aging test is completed, solar panels, to standard test conditions, the test components for power test, according to the formula of attenuation rate, solar energy, determine the performance of photovoltaic modules generation attenuation.

field comparison method is from the date of component production run, according to the project capacity to extract a sufficient number of samples of components, solar equipment, by the national qualification authentication, CMA） Third party testing laboratory, photovoltaic (pv) grid, according to GB/T 6495. 1 standard, the method of testing after its initial maximum output power, and other components installed in the same environment with batch production under normal operation of power generation, running after one year from the date of measuring the maximum output power again. Compare twice before and after the maximum output power, according to the formula of attenuation rate, determine the performance of photovoltaic modules generation attenuation.

note: the above definition and calculation formula of the source of the youngsters who can send the new [2017] no. 32 of the National Energy Administration of industry and information technology, state photovoltaic products on improving the main technical indicators and strengthen supervision notice

' Photovoltaic modules power attenuation analysis 】

in practice, photovoltaic modules after manufactured has been in a state of decay, solar portal, but did not see the light in the packing attenuation is very slow, once you begin to accept the sun after attenuation will accelerate sharply, attenuation gradually stabilized after a certain proportion, as shown in the figure below the first year of a model for the decay curve:

photovoltaic modules in the first year of attenuation curve model

in the figure above 3% in the first year of the total attenuation data taken from a company of photovoltaic modules 25 years of warranty attenuation, the attenuation of 25 years to ensure - as shown in figure 4 2

photovoltaic modules decay curve

can be seen from the above, in the first year of photovoltaic modules maximum attenuation value is 3%, 24 years behind every year attenuation value is 0. 7%.

the original title: science | photovoltaic module definition and calculation formula of attenuation rate