MasterNova The MasterNova range includes the 250-300-400-500-600-800 kVA three-phase models and 30-40-60-80-100 kVA three/single-phase and uses double conversion on-line technology (VFI) with an isolation transformer on the output of the inverter.The load is powered by the inverter with a filtered, stabilised and regulated sinewave supply. The input and output filters considerably increase the immunity of the load to mains disturbances and surges, even on bypass.