2.5 kilowatts. The full-automatic gas-fired sweet potato roasting furnace uses a 2.5 kW inverter, otherwise it will not be driven to use. Inverter is a converter that converts direct current energy (battery, storage battery) into constant frequency, constant voltage or frequency modulation and voltage regulation alternating current (generally 220V, 50Hz sine wave). It consists of inverter bridge, control logic and filter circuit.