Comparison of Charging and Usage Efficiency of Portable Fan Batteries Using Grid Electricity and Solar Panels at Different Times. Journal of Technology and Policy in Energy and Electric Power, [S. l.], v. 1, n. 1, p. 28–36, 2025. DOI: 10.33322/3jksma56. Disponível em: https://jurnal-puslitbangpln.id/index.php/jtpeep/article/view/90. Acesso em: 2 nov. 2025.