Because the inverter is always active, there is zero transfer time when the power fails.
Similar to Off-line, but includes an autotransformer (AVR - Automatic Voltage Regulation). This allows the UPS to boost or lower incoming voltage without switching to battery power. shemy raboty ibp
Activates when utility power fails completely or fluctuates beyond the AVR's corrective range. Because the inverter is always active, there is