Series resistance $(Rs)$ is considered to be one of the most important parameters affecting solar cell performance, especially those operating under concentrated solar radiation. Many methods have been proposed where the estimated $Rs$ values do not coincide or even come close to each other. In this paper, seven methods for determining $Rs$ are reviewed and verified experimentally using a commercial single-crystal silicon solar cell ($104cm2$ of total area). Their differences lie principally in: (1) number of diodes quoted in the solar cell model; (2) other assumptions (constant ideality factor or not, infinite, or finite shunt resistance); and (3) simultaneous determination of other parameters or not. Based on these methods, $Rs$ values were derived by extracting the necessary parameters from the measured $I–V$ characteristics of the cell at different illuminations and cell temperatures. According to these methods, the obtained $Rs$ values varied greatly in comparison with each other as well as its trend with temperature variation.

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