Because the inverter is always active, there is zero transfer time when the power fails.
Provides the highest level of protection against all power disturbances (noise, spikes, frequency shifts), but is more expensive and slightly less energy-efficient due to constant double conversion. Summary Comparison Table Off-line (Standby) Line-Interactive On-line (Double Conv.) Transfer Time 0 ms Voltage Regulation None (only on battery) Basic (via AVR) Perfect (constant) Best Use Case Home computers Small offices, workstations Servers, data centers Cost
An evolution of the standby UPS, often used for small office networks. shemy raboty ibp
Activates when utility power fails completely or fluctuates beyond the AVR's corrective range.
Incoming AC power is immediately converted to DC (rectifier) and then back to perfect AC (inverter). The load is always powered by the inverter. Because the inverter is always active, there is
Low cost and high efficiency, but features a short "switching delay" (typically 4–10 ms) and no voltage regulation in normal mode. 2. Line-Interactive Scheme
The most advanced scheme, designed for critical equipment like servers and medical devices. Activates when utility power fails completely or fluctuates
When voltage falls outside a specific range or fails entirely, a mechanical switch transfers the load to the internal battery and inverter.