How long does a standby generator last, and how do you extend it?
Maintained lasts 14 years, left alone about 10. That gap is yours to keep.
A standby generator typically lasts about 10 to 14 years. Regular exercise cycles and yearly service are what keep it ready.
Pros who do this work near you
Local pros in St. Johns County who service standby generator. Free to browse.
Two lifespans
The unit you never test is the one that will not start when the power goes out in a storm, failing exactly when you need it.
Overview
A standby generator only earns its keep if it starts. That means it needs to be exercised, serviced, and left alone in the right way. Skip the annual service and it will fail the one time it matters.
The maintenance that buys you the years
- Let the weekly self-test runHigh impactWeekly
The self-test keeps the starter, battery, and fuel system alive.
- Yearly service by a proHigh impactYearly
Oil, filters, spark plugs, and coolant all need periodic replacement.
- Test the transfer switch under loadHigh impactYearly
The generator itself may run, but the transfer switch is what actually powers the house.
- Keep the enclosure clear and unblockedMedium impactOngoing
It needs airflow and clearance. Pests love the warm housing.
- Check the fuel supplyMedium impactYearly
Natural gas lines, propane tanks, and diesel all age or leak.
Signs it is failing
- The unit fails a self-test
- The battery is dead
- Rodents or wasps in the housing
- Fuel odors
- It runs but the house stays dark (transfer switch)
Repair or replace
Batteries, plugs, and controllers are worth replacing. Past 10 to 12 years with a major engine or alternator failure, replace.
The facts
Hurricane season is what standby generators are for in Florida. Schedule service in the spring so the unit is ready before June, not during a storm warning.
FAQ
About 10 to 14 years with yearly service.
Sources
Sources are general public references. Verify specifics for your model.
Make this one last longer
Book a pro who does this work, or add this standby generator to your free home record and get reminders when it needs service.
Keep going
Lifespans and maintenance guidance are general estimates and vary by product, use, and climate. Always follow your manufacturer's instructions.