The second-generation EA900 series 6kVA-20kVA UPS is a new generation of general-purpose UPS power supply designed and manufactured by EST, integrating the 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, effectively enhancing product performance and system reliability, and achieving higher power density integration and miniaturization. Simultaneously, to fully meet the personalized needs of users, it is a high-end mid-power online UPS power supply product specifically launched for domestic and international small and medium-sized enterprises and institutions, as well as small-scale power supply environments. It can provide high-reliability power protection for users' departmental servers, small and medium-sized local area networks, workstations, industrial control computers, small and medium-sized equipment, and other small and medium-sized precision electronic instruments.