Find top rated generator installers in your area

Perform generator maintenance at least annually. Refer to your owner’s manual for instructions for oil changes, air filter replacement, spark plug replacements, cleaning, and battery testing. Avoid leaving gasoline in your tank if you don’t plan to use it for an extended period. Run or exercise your generator periodically to keep its parts well-lubricated. If you notice problems with your generator, schedule a repair to avoid escalating damage.

With regular maintenance, a generator can last up to 50 years, and most standby generators last up to 3,000 hours. Avoid running your unit for more than 500 continuous hours, and look for extended warranties to maximize your investment.

The size of your generator depends on the size of your home and its power consumption. You'll need more for a home with central AC, electric heat, and electric appliances. Most mid-size homes in the U.S. need a generator that produces between 22kW and 32kW of power for reliable whole-home backup. You'll only need about half that for critical circuits.