How Often Should I Service My Standby Generator?

Every fall we get the same call, and it almost always comes on the first cold, windy night: “The power just went out and my generator didn’t kick on.” A standby generator is one of the best investments an Oklahoma homeowner can make — but only if it starts the moment the grid drops. The units that fail are almost never the ones that were maintained. They’re the ones that sat quietly in the side yard for a year while everyone assumed it would just work.

Fall is the right time to think about this. Winter is when you actually need the generator, between ice storms taking down lines and the occasional hard freeze that knocks out power for days. Getting the unit serviced now — before the first outage, not during it — is the whole point.

The Short Answer

A home standby generator needs three layers of maintenance:

• Weekly — an automatic self-test (the “exercise cycle”) that runs the engine for a few minutes on its own.
• Roughly every 6 months, or by run hours — an oil and filter change, plus a spark-plug and air-filter check. Heavy outage seasons burn through hours faster than the calendar suggests.
• Once a year — a full professional service and load test to confirm it will actually carry your house.

The exercise cycle is automatic. The oil changes and the annual service are the parts homeowners forget, and they’re exactly the parts that keep the unit reliable.

What the Weekly Exercise Cycle Does

Your generator is set from the factory to start itself on a schedule — commonly once a week for five to fifteen minutes — even when the power is on. That short run isn’t wasted fuel. It circulates oil through the engine, keeps rubber seals and gaskets from drying and cracking, burns off condensation, and — most importantly — keeps the starting battery topped up.

If someone turned the exercise cycle off at some point (usually to save a little propane or natural gas), that’s a problem worth fixing before winter. A generator that hasn’t run in months is far more likely to no-start when you finally need it. Stand near the unit on its scheduled day and confirm you hear it run. If you don’t know its schedule, that’s reason enough for a service visit.

Oil, Filters, and the Battery

Like any engine, a generator needs clean oil and filters. Manufacturers set the interval by run hours as well as time, which trips people up: a unit that idled through a quiet summer might be fine on the calendar, but one that carried your home through a string of storms may have logged enough hours to be due early. After a long outage where the generator ran for many hours straight, it’s smart to change the oil sooner rather than waiting for the annual visit.

The single biggest cause of a standby generator failing to start is the battery. It’s the same lead-acid battery technology as your car, sitting outside through Oklahoma heat and cold, and it typically lasts only a few years. The cruel part is that a battery can be strong enough to run the light-load weekly exercise but too weak to crank the engine hard under a real, full-load start. That’s why a battery that “seemed fine last week” leaves you dark during the actual outage. A proper service load-tests the battery instead of just watching the exercise run.

What a Professional Annual Service Covers

An annual service is more thorough than an oil change. A technician will typically:

• Change the oil, oil filter, and air filter, and inspect or replace the spark plugs.
• Load-test the battery and check charging voltage.
• Inspect the fuel supply and connections — natural gas or propane lines, regulator, and pressure.
• Check the automatic transfer switch, the component that actually flips your house from grid to generator power.
• Clear leaves, nests, and debris from the enclosure and cooling vents.
• Run the generator under load to confirm it carries the circuits it’s supposed to and shuts down cleanly.

That transfer-switch check matters. You can have a perfectly healthy engine that still leaves you in the dark because the switch that connects it to your panel failed. It’s not something you can meaningfully inspect from the outside, and it’s not a place for DIY — the transfer switch sits between utility power and your home’s wiring, and getting it wrong is genuinely dangerous.

What You Can Do Yourself This Fall

You don’t need to be an electrician to keep an eye on the basics between services:

• Listen for the weekly exercise and make sure it’s still happening.
• Keep the area clear. Pull weeds, trim back shrubs, and clear leaves so the unit has airflow and nothing is nesting inside it. Give it a few feet of breathing room on all sides.
• Glance at the status light or controller. Most units show a green “ready” light or a warning indicator. A yellow or red light, or a code on the display, means it wants attention.
• Check for pests. Mice and wasps love the warm, sheltered enclosure. Nests and chewed wiring are a common cause of failure heading into cold weather.

What you should not do is attempt the electrical side — the transfer switch, the wiring, or anything inside the panel connection. That’s licensed work for good reason.

The Bottom Line

A standby generator isn’t a “install it and forget it” appliance — it’s an engine and an automatic electrical system that both need upkeep. Let it exercise weekly, change the oil and battery on schedule, and get a full professional service and load test once a year. Do that and the unit does its one job: it starts when the power doesn’t. Fall is the moment to get ahead of it, before the first winter storm turns a skipped service into a cold, dark house.

If you’d like your standby unit checked, serviced, and load-tested before winter — or you’re thinking about adding a whole-home standby generator — Triple Play Home Services can help. We serve Edmond, Oklahoma City, Norman, Moore, and the surrounding metro with flat-rate pricing you approve up front, no surprises. Call (405) 500-5333 to get on the schedule.