Generator Maintenance Explained: What’s Included, Why It Matters, and When to Schedule Service
A generator is only useful if it works when you need it most. Generator maintenance is what ensures your system starts reliably, carries electrical load safely, and remains compliant with manufacturer and safety requirements.
This guide explains what generator maintenance includes, why it’s important, and how often service should be performed—whether you have a whole-home standby generator or a portable generator with an interlock system.
Why Generator Maintenance Matters
Generators are emergency equipment. They often sit idle for long periods, which makes them especially prone to failure if they aren’t serviced regularly.
Routine maintenance helps:
Ensure the generator starts during an outage
Prevent engine and electrical failures
Maintain manufacturer warranty coverage
Verify safe power transfer
Identify small issues before they become major repairs
A generator that hasn’t been maintained is essentially an untested system.
What Generator Maintenance Includes
Standby Generator Maintenance
Whole-home standby generators are automatic systems, but they still require regular inspection and service.
Typical standby generator maintenance includes:
Oil level inspection or oil and filter replacement
Battery testing and replacement if needed
Coolant, fuel, and air intake inspection
Inspection of belts, hoses, and electrical connections
Automatic transfer switch (ATS) testing
Load testing to verify the generator can safely carry demand
These checks ensure the generator will start automatically and operate correctly under real outage conditions.
Portable Generator & Interlock System Maintenance
Portable generators and interlock systems also require regular inspection to remain safe and reliable.
Maintenance typically includes:
Verifying proper interlock operation
Inspecting generator inlet connections and wiring
Checking panel breakers and labeling
Testing generator output under load
Inspecting cords, plugs, and connection points
Even though these systems are manually operated, their safety components are critical and must function correctly.
What Happens During a Generator Maintenance Visit?
During a professional maintenance visit, the system is thoroughly evaluated and tested.
A typical visit includes:
Visual inspection of all generator and electrical components
Operational testing under load
Verification of proper transfer or interlock function
Identification of worn or failing parts
Documentation of system condition and recommendations
This ensures your generator is ready before an outage—not discovered during one.
How Often Should Generator Maintenance Be Performed?
Most manufacturers recommend servicing standby generators once per year, or after any extended run time caused by a power outage.
Portable generators and interlock systems should be inspected:
Annually
Before storm or hurricane season
After long periods of inactivity
Routine testing helps prevent surprise failures when power is lost.
Why Professional Maintenance Is Important
Professional maintenance ensures:
Code-compliant electrical operation
Safe power transfer
Manufacturer service requirements are met
Early detection of safety or performance issues
Skipping maintenance can lead to failed startups, unsafe operation, shortened equipment life, or voided warranties.
Final Thoughts
Generator maintenance is what turns backup power from a good idea into a dependable system. Whether your home relies on a whole-home standby generator or a portable generator with an interlock, routine service ensures your system is ready when it matters most.
A maintained generator is a reliable generator.