Solar panels are one of several devices that convert sunlight into electricity. The efficiency and performance of solar panels depend on module temperature. Hence, obtaining precise surface temperature measurements of solar panels is indispensable for understanding their operational performance. When testing in a laboratory, and especially indoors, the heat flux is often measured at several locations on the panel surface to determine the temperature distribution. Nevertheless, it involves numerous sensors and high costs. Furthermore, it takes time to test repeatedly under different lighting and temperature conditions. To address the issue, temperature measurement points were strategically placed to expedite testing. The temperature measurements were taken at three count locations instead of 25. One in the center of illumination, and two held at arbitrary positions. The monocrystalline solar panel, with dimensions 530 × 350 mm and a power output of 20 Wp, was evaluated in the laboratory using a 1000 W halogen lamp as the light source. The experimental results showed average deviations of 3.63% (at 40 cm), 4.98% (at 45 cm), and 3.63% (at 50 cm) relative to the ANSYS model simulations. These results demonstrate that the simulation and experimental behaviors are well consistent.