... the most demanding and delicate of applications. a).Sine-wave outputTrue sine-wave output with less than 3% THDb).Double ... 80~286VACTransfer time0 ms; less than 4ms from inverter to bypass and vice versaLED indicatorsStatusLoad level/battery ... level, battery , utility power, inverter, bypass, overload, faultAudible alarmBypass, on battery mode, battery ...