Generac's market-leading Guardian® Series backup power systems automatically supply electricity to homes within seconds of a power outage. When utility power fails, the Guardian Series generators turn on—automatically—and begin delivering power through the home's electrical system, whether you're at home or away. Depending upon the homeowner's needs, they can back up the entire home or just the most critical items. And because they run on the home's existing natural gas or LP fuel supply, the Guardian Series doesn't require refueling. Whether the outage is just a few days or lasts a few weeks, the Guardian Series can provide backup power for as long as necessary. Then, when utility power returns, the Guardian Series generators shut down automatically and wait for the next power outage. With sizes ranging from 8 to 20 kilowatts, there is a Guardian Series home backup generator to meet virtually every backup power need.