The Generac Eco Gen 6 kW is the first automatic standby generator engineered and warranted specifically for off-grid use when used in an alternative energy system. The EcoGen 6 kW is the answer for consumers needing affordable, reliable, low-emission, off-grid standby power. Engineered to easily integrate into existing inverter and battery storage system. Runs on environmentally friendly, energy-efficient propane gas that is already stored and available at many off-grid locations. Features Generac's own V-Twin OHVI industrial engine, the only engine developed specifically for generator use. The low speed makes it the quietest in the industry, with noise and vibration levels drastically less than comparable solutions. Simplified maintenance with unprecedented 500-hour maintenance intervals saves time and money. U.S.A. Not intended for use as primary power in place of utility or in life-support applications. Read the owner's manual in its entirety before using this product. Phase Single, Auto Shutdown Yes, Fuel Type Liquid propane, Engine Cooling Air, Engine Displacement cc 530, Mounting Pad Composite, Start type automatic, Volts 120, Noise Level dB 52, Battery Required Yes, Enclosure Steel, Dimensions: 48" L x 25" W x 29" H, safety alerts: Yes. Engine Generac OHVI V-Twin, Rated Watts k - W 6, UL Listed Yes, Transfer Switch No, Amps 50, Battery Included No. Extended run capability and long life from exclusive premium oil recovery and circulation system Clean-burning propane fuel increases efficiency and contributes to longer engine life Weather-protective steel enclosure features Rhino - Coat finish system Digital Controller features LCD display with status indicators Capable of 120V or 240V , factory wired for a full 6 kW at 120V AC Factory equipped with two-wire start to easily connect to inverter control wires Ultra-quiet, low RPM , only 52dB under normal load