A horizontal solar panel (1 m x 1 m) has spectral emissivity is 0.5 from 0 to 2 µm, and 0.2 above 2 µm. If the solar irradiation is Gs= 1353 W/m², and the panel is placed on a windless day with ambient temperature of 30 °C, what is the steady-state temperature of the panel? Consider both the radiation and free convection heat transfer.