In Stock Now! The EF2400iSHC inverter combines light weight and the latest technology to produce the highest output in its class. Maximum AC Output: 2400 watts, Rated AC Output: 2000 watts. Yamaha’s Smart Throttle feature automatically adjusts engine speed to match the load. The result is quiet running, maximum fuel efficiency, and a run time of 8.6 hours at 1/4-capacity load.