Sustainable Lean Supply Chain to Minimize Waste in Solar Water Heater Production Emelia Sari, Tiena Gustina Amran, Kinanti Mutiara Takari, Annisa Dewi Akbari and Tengku Nur Azila Raja Mamat E3S Web Conf., 500 (2024) 02013 Published online: 11 March 2024 DOI: 10.1051/e3sconf/202450002013