GUARDIAN provides peace of mind for homeowners with 24/7 automatic power protection from blackouts whether you are home or away. Back up preselected circuits or the whole house within seconds of a power outage. Permanently installed. Runs on LP or natural gas. Includes prewired, prepackaged, 16-circuit automatic transfer switch for easy installation.Engine OHVI Engine Displacement (cc) 1,600 Speed (RPM) 3,600 Rated Watts (kW) 17 Rated Watts LP (kW) 17 Rated Watts NG (kW) 16 Volts 120/241 Amps 70.8 Engine Cooling Air Start Type Automatic Phase 1 Noise Level (dB) 66 Transfer Switch Automatic NEMA 1 Fuel Type LP or natural gas Enclosure Steel Mounting Pad Yes Battery Required Yes Battery Included No Auto Shutdown Yes UL Listed Yes Dimensions L x W x H (in.) 48 x 24 x 28.25 Additional Product Specs * 17 kW liquid propane * 16 kW natural gas * Generac OHVI® 992cc industrial engine for long-run, long-life operation * Handsfree operation: no fueling, no manual starting, no extension cords * True Power™ technology for safe operation of sensitive electronics * Powerful output for greater starting power * Whisper-Test™ ultra-quiet self-test feature * Steel enclosure with tough paint finish for durability * External main circuit breaker * System status LED * Digital control panel * Maintenance interval LED * External GFCI outlet * Automatic NEMA 1 transfer switch * 30-ft., 5-ft. and 2-ft. prewired conduits * Flexible fuel line connector * Outdoor connection box * Composite mounting pad * UL listed * 48in.L x 24in.W x 28 1/4in.H