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A standby generator spends most of its life waiting, and that's exactly why a maintenance schedule matters: machines that rarely run develop the quietest failures. The good news is that the entire ownership routine fits on one page, organized around a rhythm most owners come to find almost meditative: a weekly exercise, a monthly glance, an annual service. Here's the schedule, the reason behind each step, and the small stuff that decides whether your generator starts during the outage.

Weekly: the exercise run

Most standby generators exercise themselves on a schedule you set at installation, typically a 15 to 20 minute run weekly or biweekly. This isn't superstition; the exercise cycle serves three purposes. It circulates oil through the engine, keeping internal parts coated. It burns off moisture that accumulates in the exhaust and alternator. And most importantly, it's a rehearsal: any starting problem shows up on a quiet Tuesday morning instead of during the storm.

Set the exercise time for when a brief engine note won't bother anyone, and actually notice it happening. A generator that fails its weekly exercise and you didn't hear, or check the alerts for, is the classic failure story. Many models send exercise reports to your phone; read them.

Monthly: the five-minute walkaround

Once a month, spend five minutes with the enclosure open. Four things to look at:

Oil level between the marks, since slow seepage shows up here long before anything alarms.

The area around the unit: leaves, grass, snow drifts, and the wasp nests that love enclosure corners all block airflow.

Rodent evidence, because mice find generator wiring harnesses delicious and the damage is rarely covered by warranty.

The enclosure door seals and latch, which take wind and sun abuse year-round.

This walkaround is also the right moment to glance at the fuel situation: natural gas connections stay put, but propane tank levels drift downward over months of small exercise runs, so note the gauge.

Annually: the professional service

The once-a-year service is the backbone of the whole schedule, and it's worth the fee even for owners comfortable with tools. The visit typically covers an oil and filter change, spark plug inspection or replacement, air filter service, battery load testing, coolant checks on liquid-cooled models, valve clearance checks on longer intervals, and a full transfer-switch exercise under simulated outage conditions.

The battery deserves special mention. Starting batteries fail more often than engines in well-maintained generators, and they rarely fail gradually: one day the machine cranks slowly, the next it clicks. Most service plans replace the battery proactively every two to three years, which is cheaper than the emergency version of the same purchase. If your model reports battery voltage to your phone, a downward drift between services is the early warning.

After every real outage: the post-event check

Actual running time accelerates the schedule. After any extended outage, check the oil level before the next exercise, note the hours on the meter, and book an oil change early if the manual's interval is close. Generators that ran for days during a regional emergency often also need a fuel-system look on propane connections or gas lines, plus a wash-down if the unit sat in storm debris. The machine that saved you last week deserves ten minutes of inspection this week.

The records that protect your warranty

Keep a simple log: exercise notices, service dates, oil changes, battery replacements, and any error codes with their resolutions. Manufacturers routinely require proof of scheduled maintenance for warranty claims, and a folder of invoices plus a one-page log settles disputes that would otherwise become expensive. Owners who sell the house find the log has cash value too: a generator with documented care reads as an asset, not a question mark.

For owners still planning an installation, this schedule is also a purchasing input: brands with dense dealer networks make the annual service trivial to book, and the load-matching you did before buying, ideally with a generator for house sizing pass, keeps the machine running in its comfortable range, which is itself a lifespan strategy.

Conclusion

Standby generator maintenance compresses to a rhythm: weekly exercise you actually notice, a monthly five-minute walkaround, an annual professional service with a fresh battery every few years, and a check after every real event. None of it is difficult, and all of it compounds: the owners who follow this page-shaped schedule are the ones whose generators start without hesitation on the night it matters.

FAQ

How often should a standby generator be serviced? Annually is the standard for a typical backup-use home unit, covering oil, filters, plugs, battery testing, and a transfer switch exercise. Heavy use during a long outage moves the next oil change earlier, per the hours listed in the manual.

Do standby generators need oil changes if they rarely run? Yes. Oil ages from moisture, acids, and time, not just engine hours, and manufacturers specify annual changes regardless of runtime. A generator that exercised fifty hours a year still needs its yearly oil and filter service.

What is the most common standby generator failure? The starting battery. It fails more often than any engine component and usually fails suddenly, which is why regular battery testing and proactive replacement every two to three years is the single most valuable line in the maintenance schedule.