Economic and environmental benefits of using batteries and heat pump water heaters to effectively utilize daytime electricityMao Serikawa, Seiichi Kashihara, Junta Nakano, Takashi Akimoto, Toshiharu Ikaga and Shuzo MurakamiE3S Web Conf., 716 (2026) 04014DOI: https://doi.org/10.1051/e3sconf/202671604014