How to Care for a Generator During a Long Outage

The daily outage routine, in order

A generator that only runs for an hour on a Saturday shrugs off mistakes. The same generator asked to run for days under load will not. During a long outage the engine, oil and fuel system are under constant strain, so the care routine has to be short, repeatable, and done at least once a day.

The order matters. Check safety placement and the CO alarm before you think about fuel, check oil before you start, and manage the load while it runs. That keeps a bad decision from turning into a dangerous one on day two or day three.

Check placement and CO alarms before anything else

Carbon monoxide is an odorless, colorless gas, and the CPSC warns that a single portable generator can produce as much CO as hundreds of cars and can kill within minutes. Because you cannot see or smell it, the daily placement check is the most important one you will do, every single day of the outage. The rules are the same whether the unit is new or has run for two days straight. See generator carbon monoxide safety for the full picture.

Confirm the generator is still outdoors, more than 20 feet away from any window, door or vent, with the exhaust facing away from the home. The CDC gives the same guidance: never run a generator inside the house or garage, even with the doors and windows open. Storms can shift a unit a few feet, and a wind change can push exhaust toward an open window.

The CPSC recommends battery-operated CO alarms on every level of the home and outside sleeping areas. Check the alarm's batteries as part of the daily routine, and replace the detector on the manufacturer's schedule, which the CDC puts at about every 5 years.

If your generator has a CO sensor that shuts the engine down, treat it as a backstop. The CPSC has proposed a safety standard for portable generators covering these shutoff systems, but the sensor protects the generator, not the house. You still need the household alarm. Learn more about generator CO sensor requirements.

• Generator stays outdoors, more than 20 feet from windows, doors and vents
• Exhaust points away from the home
• CO alarm batteries test OK on every level
• Fuel level is next on the schedule
• Oil level reads full with the engine cool

Refuel on a schedule, never mid-run

A portable generator running the essentials will empty its tank faster than you expect, so refueling becomes a planned task, not a reaction to the engine sputtering. Pick a time of day, make it the same time, and fill before the tank gets close to empty.

Turn the generator off and let the engine cool before you remove the cap. Gasoline poured onto a hot engine or exhaust is a fire hazard, and the cool-down takes only a few minutes. Refueling while the engine is running or hot is the fastest way to turn a routine chore into an emergency.

Store fuel in approved cans and keep a rotation so the gasoline does not sit too long. A fuel stabilizer keeps stored fuel usable, which matters most when you cannot predict when the outage will end. Read about fuel stabilizer and storage life to set up a supply that lasts.

If your generator accepts multiple fuels, a dual fuel generator gives you an option to switch to propane when gasoline is hard to find. Practice the switch before the outage, not during it, and keep the manual handy.

Check the oil level every day

Oil is what keeps an air-cooled engine alive through hours of continuous running. Check the level once a day with the engine cool and the generator level, and top off only with the oil type in your manual. Using the wrong viscosity is worse than running a little low.

Most portable generators have a low-oil shutdown that stops the engine before the level becomes dangerous. That feature is a backstop, not a substitute for the check, and it will not protect you if the oil has degraded after many hours under load.

Plan an oil change for the middle of a long outage instead of waiting until it is over. Fresh oil keeps the engine cooler and cleaner when it is working hardest, and the change takes less time than hunting for a part later.

Keep the load steady and below the rating

The wattage on the generator's label is a starting number, not a suggestion for what to run hour after hour. The continuous load should sit below the rated running watts, and your daily check should include walking through what is actually plugged in. Review running watts vs starting watts to set a realistic limit.

Connect through a transfer switch or heavy-duty cords sized for the load, and avoid long, light extension cords that drop voltage. Understand generator cord gauge and length so the wiring does not become the weak link.

A live wattage reading, either from the generator's panel or an inline meter, shows you where the load sits before it becomes a problem. See generator wattage metering for how to read it. Spread big loads out instead of starting them all at once, and let anything that asks for a surge get its own start. A generator asked to start a well pump while the refrigerator is kicking in is being set up to trip the breaker.

Know the symptoms of CO poisoning

The CDC lists headache, dizziness, weakness, upset stomach, vomiting, chest pain and confusion as the most common symptoms of CO poisoning, and describes them as flu-like. The EPA adds that at higher concentrations CO causes impaired vision and coordination, headaches, dizziness, confusion and nausea, and that very high concentrations can be fatal.

If anyone in the house feels these symptoms during an outage, get outside to fresh air immediately and call emergency services. Do not stay inside to investigate, and do not send someone back in to shut the generator off first. The generator's placement is almost certainly the problem, and people are more important than equipment.

The day the outage ends

When utility power returns, shut the generator down and let it cool before you touch anything. Then run through the same checks in reverse: oil level and condition, the fuel system, and a general inspection of cords and outlets. Walk through generator storage preparation so the unit is ready for the next storm.

A long outage is the reason most people buy a generator in the first place. A few minutes of daily care is the difference between a unit that finishes the outage and one that quits at the worst possible moment. Match the generator to the job before the next storm, and the daily routine gets easier. Start with the best portable generators to see what fits your household.

What to pick for a long-outage runner

Questions

Can I run a portable generator 24 hours a day during an outage?

A portable generator can run continuously if it is placed safely outdoors, kept fueled, and checked daily, but do not expect it to behave like a standby unit. Check the oil once a day, refuel on a schedule with the engine cool, and keep the load below the continuous wattage rating. A home standby generator is built for unattended hours, while a portable unit needs attention.

How far from the house should my generator be during a long outage?

The CDC and CPSC both say to run generators outdoors, more than 20 feet from any window, door or vent, with the exhaust facing away from the home. Never run it in a garage, basement or shed, even with the door open.

How often should I check the oil during a long outage?

At least once a day, with the engine cool and the generator level. Top off only with the oil type in your manual, and plan a full oil change for the middle of a long outage rather than waiting until it is over.

Is it safe to refuel a generator while it is running?

No. Turn the generator off and let the engine cool before refueling. Gasoline spilled on a hot engine or exhaust is a fire hazard, and the cool-down takes only a few minutes.

Do I still need a CO alarm if my generator has a CO sensor?

Yes. The generator's CO shutoff protects the machine by stopping the engine when CO builds up, but it does not protect your home. The CPSC recommends battery-operated CO alarms on every level and outside sleeping areas, and you should check those batteries during your daily generator round.

What should I do if I suspect CO poisoning during an outage?

Get everyone outside to fresh air immediately and call emergency services. Do not stay inside to investigate or shut the generator off first. Headache, dizziness, weakness, nausea and confusion are the warning signs listed by the CDC, and they can come on before you realize anything is wrong.