Keeping a generator running for weeks

In a normal year, a standby generator barely works. Generac's default exercise is 5 minutes every other week, and Kohler's is a 20-minute weekly run. Generac's normal schedule calls for an oil and filter change every 2 years or 200 hours, whichever comes first. Most owners meet it with a single service visit.

A long outage turns the calendar into an hour meter. A generator running around the clock logs 24 hours a day, 168 hours a week. Generac's owner's manual for its 10 to 26 kW air-cooled units changes the rule in exactly the conditions a Florida hurricane season brings: when the unit runs continuously in ambient temperatures above 85 F, change the oil and filter every 100 hours, or every year. It also asks owners to verify the oil level daily during extended running, because the generator shuts itself down on low oil.

Kohler's service schedule for its 20 and 26 kW residential models (TP-7092) sets its own points: check oil every 8 hours of operation on the 20 kW model and every 24 hours on the 26 kW, and change oil yearly or every 150 hours with standard oil. On the 26 kW with Kohler's premium extended-life synthetic, the interval is 2 years or 300 hours.

The local record shows why this matters. Milton's outages took about four days to clear in Sumter, Lake and Marion counties. Four days is about 96 hours, right at Generac's hot-weather interval. Irma's statewide outages took ten days to fall below 1 percent. That is long enough for two changes.

None of this is hard. It just has to be planned before the outage, because the oil you need is the oil already on your shelf. The long-term preparedness plan puts this step alongside fuel, water and food.

Find your unit's owner's manual and mark the long-run rules

Generac's continuous-use guidance for its Guardian 10 to 26 kW units, 2017 to present, is short and clear. After every 24 hours of continuous running, shut the generator down for at least 30 minutes. Then:

• Check the oil and top it off with the oil your manual names.
• Look over the fuel lines for leaks.
• Clear the enclosure louvers of leaves, grass clippings and storm debris so air can move.

Generac states no hard maximum run time. The daily pause is the rule. Kohler's manual likewise says to check oil before each use and periodically during extended operation, with the unit shut down for a few minutes first so the reading is accurate.

A simple routine works well. Pick a cool hour, early morning is easiest, and make it the same time each day:

1. Follow your manual's shutdown steps so the unit is off and cannot restart while you are working on it.
2. Let the engine cool. Hot oil and hot metal burn.
3. Pull the dipstick, wipe, reinsert, read. Add oil a little at a time to the full mark. Do not overfill.
4. Glance at the fuel gauge if you are on propane, and at the louvers.
5. Restore the unit to automatic as the manual describes.
6. Write the date, the hour meter reading and the oil added in a notebook.

The notebook matters more than it seems. It tells you when the next oil change is due and whether the engine is using more oil than usual, which is worth a call to your installer.

Two safety notes. Do not service the unit in high wind, lightning or heavy rain; wait for a lull. And keep children, pets and helpers clear of the enclosure while you work.

Practice the daily check once with your installer at startup

Here is how the manuals' numbers play out over outages of different lengths.

Generac, 20 to 26 kW, running above 85 F: change oil and filter every 100 hours. Each change takes about 1.9 quarts of oil with the filter. After the first 25 hours of a brand-new unit, Generac calls for a break-in oil change, so a generator installed this spring that has not yet had it will need that one first.

Kohler 26 kW (26RCA): check oil every 24 hours; change every 150 hours with standard oil or every 300 with the premium synthetic. Capacity is about 2.0 quarts. Kohler also services the air cleaner and spark plugs at 150 hours and replaces them at 300.

A worked example: a three-week outage is 21 days of 24 hours, 504 hours. Take out Generac's 30-minute daily pause and the engine runs about 494 hours. On a Generac in Florida heat, that means changes at about 100, 200, 300 and 400 hours, plus one when the outage ends: roughly 5 oil changes, about 9.5 quarts of oil and 5 filters. On a Kohler 26 kW with standard oil, the same outage means changes at about 150, 300 and 450 hours: about 6 quarts and 3 filters, plus air cleaner and spark plug service.

Shorter outages scale down simply:

• About four days, like Milton locally: roughly one change on a Generac in heat.
• About ten days, like Irma statewide: roughly two changes.
• About three weeks: roughly five.

Whether the hot-weather rule applies depends on the actual temperatures during your outage. In a Villages September it usually will. Your installer can confirm the schedule for your exact model, and the generator brands page compares the major makers.

Ask your installer for your model's long-run oil schedule in writing

Everything below fits on one garage shelf, costs little, and is impossible to find the morning after a hurricane. Stock it before June 1 and check it each spring.

For a Generac 20 to 26 kW unit:

• About 10 quarts of the oil the manual names. After break-in, Generac recommends its 5W-20 gaseous engine oil and says to use no additives.
• Five oil filters of the part number in your owner's manual.
• A spare air filter and a set of spark plugs. Generac lists these by engine size, and its Schedule B replaces them every 4 years or 400 hours.
• Or simply a few of Generac's maintenance kits, which bundle oil, filter, air filter and plugs.

For a Kohler 26 kW unit:

• About 6 to 8 quarts of the 5W-30 or 10W-30 synthetic the manual names, or the premium oil if you use the 300-hour interval.
• Three or four oil filters, plus an air cleaner element and spark plugs.

For any unit:

• A funnel, a drain pan, rags, nitrile gloves and a sealed container for used oil.
• A headlamp or flashlight with spare batteries.
• The owner's manual, printed, and a notebook and pen for the run log.
• A soft brush for clearing louvers.

Those quantities are sized for a three-week outage, the long end of planning. For a one-week horizon, half as much is plenty. Either way, label the shelf so anyone in the household, or a neighbor helping out, can find what is needed.

Fuel is on a separate list. If you are on propane, the refill plan on generator fuel runtime belongs on the same shelf, written on paper.

Stock oil and filters for three weeks before the season starts

Some owners are happy to change their own oil. Others would rather never touch the unit. Both are reasonable, and the owner's manual is the guide to who may do what.

Generac's and Kohler's manuals describe the checks and service steps for their residential units. Read yours for the tasks it expects an owner to handle and the ones it reserves for a servicing dealer, and follow it. Warranty terms are set by the manufacturer, so ask your installer how owner maintenance is treated for your model.

A practical division of labor for many Villages households:

• You: the daily oil check and top-off, the fuel gauge, clearing the louvers, and the run log.
• Your installer: the regular service before each season, any oil change you would rather not do, air filter and spark plugs, battery checks, and anything that shows a fault code.
• Agree in advance: whether your installer will come out for oil changes during a long outage, how to reach them, and what you will do if roads are closed. Write the answer down.

Even if you never plan to change the oil yourself, ask your installer to walk you through it once on install day: where the dipstick is, where the drain and filter are, and how the controller is set to off and back to auto. Many residents are seasonal or live alone, and knowing the steps is part of being self-reliant.

If a family member or neighbor might do the daily check while you are away or unwell, show them too, and leave the printed manual on the shelf. A generator is only as dependable as the person checking its oil.

Agree on an outage service plan with your installer at install

A permanently installed standby generator is designed to run outdoors, near the home, in place. That is a large safety advantage over a portable unit in a garage doorway. A long run still deserves care.

• Let it cool. Shut down and wait before opening the enclosure. Generac's 30-minute daily pause doubles as cool-down time.
• Keep it from starting while you work. Follow the manual's shutdown steps. A standby unit starts on its own when it senses an outage, so turn the controller off before reaching inside.
• Never service it in a storm. Wait for wind, lightning and heavy rain to pass. The house is already running; a check can wait an hour.
• Keep the air moving. Clear leaves, palm fronds and storm debris from the louvers and the space around the unit. Do not stack sandbags, lawn furniture or anything else against it.
• Watch for gas smells. If you smell gas near the fuel line, leave the area and call your gas utility or propane supplier from a safe distance.
• Keep carbon monoxide alarms working. The CDC and Ready.gov both advise battery or battery-backup CO alarms on every level of the home. A standby unit's exhaust is placed and directed away from the house and, under the district ARC rules, away from neighbors, but alarms are cheap insurance.
• Handle used oil properly. Seal it and take it to a recycling drop-off once roads open.

And keep an eye on yourself. Servicing a generator in Florida heat is real work. Go early in the morning, drink water, and ask for help if you need it. The CDC notes that people over 65 are more prone to heat illness; see keeping the AC running for why cooling sits at the top of the load list.

Test your CO alarms and clear space around the unit this week