What is the difference between single-phase and 3-phase UPSs?

single phase  A phase is defined by the electric load distribution corresponding to the type of unit, which could be a single-phase or a three-phase Difference Between 1-Phase & 3-Phase Supply Comparison between Single Phase & Multi or Poly Phase Three Phase vs Single Phase Power

A Comparison between Single Phase and Three Phase Power Supplies Basics, Advantages, Disadvantages, Applications and Differences  Since the single-phase connection has only one phase wire, if any failure occurs in the network, the entire power supply will be interrupted

In fact, compared to single-phase power circuits, 3-phase circuits can provide almost twice the power with the same exact current Using 3-phase Single Phase Power Supply The type of AC supply where all the voltages in the system varies in a same sinusoidal pattern is called single phase