Patent ID: 8102066

Claim:
An inverter generator having a generator unit that is driven by an internal combustion engine whose throttle valve is moved by an actuator and generates alternating current, a converter that is connected to the generator unit and converts the alternating current to direct current, an inverter that is connected to the converter and converts the direct current to alternating current with switching elements to supply to an electrical load, comprising: a voltage/current detector that detects voltage and current supplied to the electrical load; a power factor calculator that calculates a power factor based on the detected voltage and the current; a load power estimator that estimates a power of the load based on at least the detected current and the calculated power factor; a desired engine speed determiner that determines a desired speed of the engine based on the estimated power of the load; and an actuator controller that controls operation of the actuator such that an engine speed becomes equal to the desired engine speed.