The A-iPower Model SUA4500 4500W Generator is powered by a reliable 208cc/7HP single cylinder . four-stroke OHV engine and coupled by high quality alternator. This unit produces 3500 running watts and 4000 surge/starting watts with a 68dB sound rating from 23 feet to ensure low noise for quiet operation. The alternator produces more surge wattage to start motor-driven appliances and tools. With a four-gallon rigid steel fuel tank with built-in fuel gauge . this unit can run up to 13 hours at 50 percent load. The low oil shut-off sensor equipped on the engine is designed to protect the engine for long life and easy maintenance. The easy-to-reach integrated control panel makes the unit user-friendly.