The generator experts present the #1 selling automatic standby generator for 24/7 automatic power protection. Choose what you would like to backup, so you can keep your life going without disruption. Unlike a portable generator that requires frequent refueling, the automatic standby generator runs on existing natural gas or LP fuel. The Generac OHVI engine is designed for extended run times - up to 3,000 hours of service with proper maintenance and typical usage. Generac automatic standby generators include a pre-wired EZ switch and wiring kit that provides the easiest and most cost effective installation available on the market.