This type of UPS is able to tolerate brownouts and overvoltages without interruption, without consuming limited reserve energy.
Instead, it compensates by automatically selecting different power outlets on the autotransformer.
Depending on the design, changing the autotransformer outlet may result in a very brief interruption of the output power, which may cause a "beep" of inverters with a loss of power alarm.
Range: 700VA - 3600VA
