A standby generator is an engine that spends its life parked, waiting for the one week it earns its keep. Engines hate being parked. The entire maintenance discipline exists to fight that — and it’s genuinely not much: a self-test the machine runs by itself, a glance from you now and then, and one honest service visit a year. The units that die during outages are, overwhelmingly, the ones where all three quietly stopped happening. This rhythm starts the day commissioning ends, and it’s the operating half of the installation guide.
What is the weekly self-test, and why should you occasionally listen?
Once a week, at a time set during commissioning, the unit starts itself, runs a few minutes, and shuts down. No transfer, no flicker — just an engine keeping its fluids moving and proving it still starts. Fifty-two rehearsals a year for a performance that may never come.
The catch is psychological: you stop hearing it. Month one, you notice every test. Month six, it’s birdsong. That’s why the owner layer of this rhythm is a monthly glance at the status indicator — the unit reports failed tests, but only to people who look. A failed self-test discovered in fair weather is a checklist; the same failure discovered by an outage is the whole reason this page nags.
What happens at the annual service?
The car-like things: oil and filter by the manual’s run-hour interval, air filter, spark plugs on their schedule. The generator-specific things: battery test and terminals — batteries being the leading cause of no-starts — fuel-side inspection, control firmware, and a transfer test under real load, which is the annual proof that the ATS still moves your house the way commissioning demonstrated.
And one humble item that earns its slot on this soil: a level check on the pad. Clay moves — and the growth corridor’s young lots move most; catching a quarter-inch of settle early is the cheap version of that repair. Service access being unobstructed — the clearance decision made back at placement — is what keeps this visit an hour instead of an argument.
What’s on you between visits?
Little, honestly. Monthly: status light, and clear the unit’s breathing room — leaves against the intake in October, grass clippings all summer, the odd wasp settlement. After storms: confirm nothing’s leaning on it. After any long run: check the oil like you would after a road trip, because a multi-day outage puts something like a year of normal engine time on the machine in one go — which pulls the next service forward regardless of the calendar.
That’s the whole discipline. It costs one service appointment and maybe six minutes of your attention a month, and it’s the difference between owning backup power and owning a lawn ornament with a five-figure history.