Analysis of each branch current of serial solar cells by using an equivalent circuit model

doi:10.1088/1674-1056/23/2/028801

Abstract In this paper, based on the equivalent single diode circuit model of the solar cell, an equivalent circuit diagram for two serial solar cells is drawn. Its equations of current and voltage are derived from Kirchhoff’s current and voltage law. First, parameters are obtained from the I–V (current–voltage) curves for typical monocrystalline silicon solar cells (125 mm×125 mm). Then, by regarding photo-generated current, shunt resistance, serial resistance of the first solar cell, and resistance load as the variables. The properties of shunt currents (I_sh1 and I_sh2), diode currents (I_D1 and I_D2), and load current (I_L) for the whole two serial solar cells are numerically analyzed in these four cases for the first time, and the corresponding physical explanations are made. We find that these parameters have different influences on the internal currents of solar cells. Our results will provide a reference for developing higher efficiency solar cell module and contribute to the better understanding of the reason of efficiency loss of solar cell module.

Keywords: solar cell equivalent circuit current property

Received: 29 January 2013
Revised: 23 May 2013
Accepted manuscript online:

PACS:	88.40.-j	(Solar energy)
	88.40.fc	(Modeling and analysis)
	88.40.jj	(Silicon solar cells)
	88.40.H-	(Solar cells (photovoltaics))

Fund: Project supported by the National High Technology Research and Development Program of China (Grant No. 2012AA050302), the National Natural Science Foundation of China (Grant Nos. 61076059 and 51202301), and the Science & Technology Research Project of Guangdong Province, China (Grant No. 2011A032304001).

Corresponding Authors: Shen Hui
E-mail: shenhui1956@163.com

About author: 88.40.-j; 88.40.fc; 88.40.jj; 88.40.H-

Cite this article:

Yi Shi-Guang (易施光), Zhang Wan-Hui (张万辉), Ai Bin (艾斌), Song Jing-Wei (宋经纬), Shen Hui (沈辉) Analysis of each branch current of serial solar cells by using an equivalent circuit model 2014 Chin. Phys. B 23 028801

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