The NetPower series is available in 600-2000VA models and uses Line Interactive (Voltage Independent) technology. The load is powered from the mains through an Automatic Voltage Regulator to stabilise brownout, sag and surge voltages, and EMI filters suppress spikes and transients. When the mains voltage fails, the load is powered by the inverter with a pseudo sinewave to provide sufficient runtime for computer system shutdown using the fre PowerShield³ software. Model numbers include NPW600 (600VA), NPW800 (800VA), NPW1000 (1000VA), NPW1500 (1500VA), NPW2000 (2000VA)