A test method for low-light performance of solar cell modules

Abstract

The invention relates to a testing method of a solar cell, in particular to a testing method of the low-light performance of a solar cell assembly. The testing method comprises the steps that firstly, the maximum output power when the light intensity is 1000 W / m<2> and the maximum output power and the light intensity of the solar cell assembly under the condition that one or more light filtering device lead wire meshes or one or more light filtering device stainless steel meshes are arranged are tested; then, the conversion efficiency of the solar cell assembly under different conditions is obtained according to the equation that eta=Pmax / (S*1000 W / m<2>)*100%, and furthermore, low-light manifestations under different light intensities are obtained; finally, a low-light performance curve is drawn out according to measured data. According to the testing method, the lead wire mesh / meshes or the stainless steel mesh / meshes is / are used as a light filtering device / light filtering devices, so that a good low-light effect is achieved; by changing the layer number of the lead wire mesh / meshes or the stainless steel mesh / meshes, the light intensity can be controlled at will; the optical spectrum is even, the mismatching phenomenon is avoided and the testing method is simple and easy to operate.

Description

technical field [0001] The invention relates to a test method for a solar cell, in particular to a test method for the weak light performance of a solar cell module. Background technique [0002] The solar panel can still convert light energy into electrical energy under weak light intensity, which is the weak light performance of the solar panel. The low-light performance of solar cell modules can directly reflect the dark current of solar cells, PN junction leakage, etc., and directly affect the application performance of modules and the power generation of photovoltaic systems, which is of great significance to improving battery performance. One of the technical advantages of thin-film solar cells is that they have excellent low-light performance and a wider spectral response range. In order to fully grasp the performance of solar cell components during operation and provide reference data for further improving component performance, real-time monitoring of component low-...

AI Technical Summary

Problems solved by technology

At present, there are only a few authoritative multi-light source solar simulator manufacturers in the world that can perform low-light testing, and ensure that there is no mismatch in the spectrum during the test. The light intensity adjustment of this multi-light source solar simulator is mainly by controlling the light source. The number of switches or the use of filters to block the light source is achieved, and the spectrum control is achieved through neutral filters and uniform plates; however, the test equipment is expensive, and the uniformity of the spectrum cannot be well guaranteed

However, domestic solar simulators are mainly driven by the current or voltage of the motherboard to fit the weak light curves under various lighting conditions. original data); the low-light curve is only obtained by fitting and has no practical significance

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