DETERMINATION OF OPTIMAL TILT ANGLE FOR MAXIMUM SOLAR INSOLATION FOR PV SYSTEMS IN ENUGU-SOUTHERN NIGERIA. Nigerian Journal of Technology, [S. l.], v. 34, n. 4, p. 838–843, 2015. DOI: 10.4314/njt.344.1017. Disponível em: https://mail.nijotech.com/index.php/nijotech/article/view/1017. Acesso em: 19 apr. 2026.