This issue is crucial, as the core of selecting and applying high-power power frequency online UPS is to balance reliability, adaptability, and long-term stability.
Core considerations
Power and load matching: The UPS rated power should be selected based on 1.2-1.5 times the actual load, with reserved expansion space, while matching the power factor of the load (inductive/capacitive loads require special adaptation).
Reliability and redundancy design: Priority should be given to models with high dual conversion efficiency (≥ 92%), and N+1 redundancy or parallel redundancy should be configured in critical scenarios to avoid single point failures.
Input/output parameter adaptation: The input voltage range should cover grid fluctuations (recommended ± 15% or more), the output voltage accuracy should be controlled within ± 1%, and support flexible switching between three-phase 380V/single-phase 220V.
Battery configuration and endurance: Choose lead-acid or lithium batteries based on backup time requirements, calculate battery capacity (Ah) and number of groups, reserve battery heat dissipation space, and match lithium batteries with a dedicated BMS management system.
Heat dissipation and installation environment: The power frequency machine generates a large amount of heat, so it is necessary to ensure good ventilation and temperature control within 0-40 ℃ in the installation environment. At the same time, the load-bearing and handling requirements of the machine body weight (high-power models are mostly ≥ 50kg) should be considered.
Protection function and compatibility: It needs to have overload, short circuit, over temperature, lightning protection and other protections, support generator linkage, and be compatible with the start-up impact of sensitive loads such as servers and precision instruments.
Monitoring and operation: Select models that support remote monitoring (SNMP/Modbus protocol), with battery status warning and fault recording functions, to reduce operation and maintenance costs.
