Generator lifespan depends on runtime hours, service history, and operating conditions. Generator life expectancy maintenance hours show how long a unit can run before service, major repair, or replacement becomes likely.
Portable generators often last 1,000 to 2,000 hours, standby units may last 1,500 to 3,000 hours, and diesel systems can reach 10,000 to 30,000 hours with proper maintenance. Most generators need service once a year or every 100 to 200 operating hours.