Journal of Engineering and Science Vol. 1 No. 2 (July–December 2022) gathers five studies linking rooftop solar performance analysis with fatigue life prediction of automotive suspension components. The first article (Comparison of Rooftop Solar Panel Output Power Based on the Apparent Motion of the Sun: Banda Aceh Case Study) examines how the Sun’s seasonal/diurnal apparent path influences optimal panel orientation and resultant energy yield in a tropical setting. The second (Analyzing the Tensile Strength of AISI 1045 Coil Springs in Avanza 2020 Cars: A Comparative Study of Experimental Results using Simulation Technology) validates material and structural behavior by comparing laboratory tensile (and likely derived stress–strain) data with simulation (e.g., finite element) outputs to refine modeling accuracy. The remaining three form a methodological sequence employing a strain‑life (ε–N) approach to fatigue: predicting service life of a minibus front coil spring over flat, ascending, and descending road profiles; jointly estimating fatigue of the coil spring and lower suspension arm under varying road surface geometries that generate different strain spectra; and isolating fatigue life of the lower suspension arm under straight‑line versus cornering conditions where combined vertical and lateral loads alter damage accumulation. Collectively, the issue emphasizes integrating empirical–computational correlation and spectrum‑based strain analysis to enhance durability forecasting while also addressing localized solar resource optimization.