The second-generation EA900 series 6kVA-20kVA UPS is a new-generation general-purpose power supply designed and manufactured by ESTAR based on its latest research and development achievements and application experience. It is compatible with both three-input single-output and single-input single-output modes, utilizes advanced DSP digital control technology, significantly enhancing product performance and system reliability, while also achieving higher power density integration and miniaturization. Additionally, to cater to the personalized needs of domestic and international small and medium-sized enterprises and institutions, as well as small-scale power supply environments, this high-end mid-power online UPS product is specifically designed to provide high-reliability power protection for departmental servers, small to medium-sized local area networks, workstations, industrial control computers, small to medium-sized equipment, and other precision electronic instruments.