Guide · Reviewed against RECI guidance and installer-published documentation. Last verified: 2026-10-22.

Storm-season readiness and maintenance: the Irish schedule (Éowyn lessons)

Storm Éowyn taught Irish households a hard lesson in January 2025: more than 750,000 premises went offline, generators sold out nationwide, and some communities waited days for ESB Networks to restore supply. The households that came through best were not the ones with the biggest generator - they were the ones whose set actually started, because it had been serviced, exercised and fuelled before the warning was issued. This guide is the maintenance rhythm that keeps a standby set storm-ready, Irish weather year after year.

Why Ireland needs a standing rhythm, not a reaction

Ireland's Atlantic storm cycle is structural, not exceptional. Meteorological services name systems every autumn through spring; the west and northwest (Connacht, Donegal) carry the highest outage exposure, and January 2025 proved that even the midlands and east are not safe from multi-day events. A standby generator that gets attention once a decade is not a backup system - it is yard art. The schedule below takes under an hour a month and one annual service.

The annual service (the non-negotiable)

An installed standby set typically requires an annual service - book it every year, ideally in late summer or early autumn, ahead of storm season. The service covers:

• Oil and filter change. The single most common cause of failed starts is degraded oil.
• Air and fuel filters. Replaced, not just inspected.
• Battery and charger test. Flat or weak batteries are the number-one real-world starting failure.
• Exercise-run check and load test. The technician runs the set under load and confirms the ATS end-to-end sequence.
• Fuel quality check. Diesel tanks are inspected for water, sludge and aging fuel; LPG systems for regulator and line condition.
• Fault-code history review. The controller logs every hesitation since the last visit; the technician reads them before they become a storm-night failure.

Most Irish installers offer annual service plans at handover. Take one: it keeps the warranty clean and puts you on the storm-season priority list when call-outs queue after every named storm.

The monthly five-minute check

Between services, a short monthly routine keeps the system honest:

1. Let it exercise. Most controllers run an automatic weekly or biweekly exercise cycle (typically 10-20 minutes under no or light load). Confirm it ran - check the log or listen for the cycle. If your unit has no auto-exercise, run it manually per the manual.
2. Walk around the unit. Clear leaves, grass, snow or nesting material from air inlets and the exhaust. Check for oil stains or fuel smell under the enclosure.
3. Glance at the controller. Any amber or red indicators? Note the code and call the service partner early, not in a Status Red week.
4. Check fuel level. Diesel tanks should sit comfortably above your multi-day autonomy target; LPG per the gauge. Top up in the quiet months - fuel delivery queues after storms too.

Fuel management through the year

The pre-storm checklist (Status Yellow and up)

When a named storm is forecast, spend twenty minutes on this before the weather arrives - and run our interactive storm-readiness check for a scored version of the same list:

1. Run a manual start test. One clean start under light load confirms battery, fuel and controller - the three things that fail on storm night.
2. Top up fuel. Fully, not "enough". Post-Éowyn fuel deliveries lag demand by days.
3. Clear the enclosure. Anything loose in the yard becomes a projectile; anything blocking airflow becomes an overheating shutdown.
4. Charge everything else. Phones, torches, power banks - the generator covers the house, not your pocket devices, and the first hour of an outage is chaos.
5. Know your changeover plan. With an ATS, nothing to do - it acts alone. With a manual switch, confirm who is home and how the sequence runs, outdoors, in the dark, in wind.
6. Bookmark ESB PowerCheck. ESB Networks owns grid restoration; its PowerCheck service shows reported outages and restoration status for your area, so you can plan fuel use against a realistic horizon.

During and after an outage

• Let the ATS work. Resist the urge to switch things off and on; the controller is managing the sequence.
• Run at sensible load. The 80% rule applies mid-storm too - stagger heavy appliances rather than stacking them (see the sizing guide).
• Refuel safely, always cold. Shut down and let the engine cool before refuelling; hot-engine refuelling is a fire risk in exactly the weather where fire crews cannot reach you quickly.
• Watch run-hours against autonomy. If restoration looks multi-day, drop to essential circuits deliberately rather than running the tank dry at 3am.
• After the event, log anything odd. Hesitant starts, new noises, fault codes - tell the service partner before the next storm, not after.

The autumn reset (one evening, once a year)

Every September: book the annual service, confirm the exercise schedule survived any outages of its own, check the battery's age (replace proactively at 3-4 years on most units - ASSUMPTION, model-dependent), verify fuel autonomy against a three-day outage, and re-run the storm-readiness check. That single evening is the difference between the households Éowyn passed over and the ones it caught unprepared.

Maintenance intervals and battery-life guidance on this page are typical practice (ASSUMPTION - model-dependent). Your installed unit's manual and your service partner's schedule are authoritative.