One of the problems with PV modules used in photovoltaic power generation systems is the hot spot phenomenon. This hot spot phenomenon occurs when a cell has a crystalline defect and is shaded for a long period of time by a building, pole, fallen leaves, bird droppings, etc., causing the cell to heat up. This not only reduces power generation efficiency but also poses the risk of causing a fire. Unlike previous approaches, the authors have proposed a parallel cell cluster method as a module cell configuration to suppress the heat generation itself, and have shown that it can significantly reduce the power generated at a module temperature of 25 °C. This method has the advantage that the reduction of heat-generating power can be achieved simply by modifying the existing cell configuration. However, since PV cell modules have characteristics that easily change with temperature, it is necessary to clarify the characteristics of PV cell modules when the temperature changes. Therefore, in this paper, as a first step to study the heated power characteristics of the proposed parallel cell cluster PV module with respect to temperature change, various parameters of the PV joule corresponding to temperature change were identified by curve fitting. Furthermore, the obtained parameters are used in simulations to obtain the I-V characteristics of parallel cell cluster PV modules when hot spots occur and are compared with experimental results to investigate the effectiveness of this method.