Chicago’s weather turns fast. A severe storm system can knock out power to tens of thousands of customers across the area at once. Neighborhoods with older overhead lines tend to get hit hardest, since those lines come down easily under wind and falling branches. Some outages clear within hours, while others stretch on for days while crews work through downed lines and storm damage, which is a long time for a generator that hasn’t been checked since spring.
Before storm season, a generator needs an inspection that follows its owner’s manual: the oil’s level and condition, the air filter, the spark plug, the fuel system, and the starting battery if it has one. Liquid-cooled models also need a coolant check, though most portable units are air-cooled and skip that step entirely. Worn or overdue parts need replacing, and the fuel lines deserve a look for damage or leaks.
One that struggles to start, stalls, or runs unevenly needs a closer look before anyone relies on it during an outage, ideally from a small engine repair shop.
Untreated gasoline can start degrading within a few weeks, and ethanol-blended gas degrades faster than ethanol-free gas. Ethanol absorbs moisture from the air, which leads to corrosion and a separated layer of water and ethanol at the bottom of the tank, and the longer the fuel sits, the higher the odds of it gumming up a carburetor.
A fuel stabilizer added to fresh gasoline slows that process. Stabilizer manufacturers commonly claim treated fuel stays usable for up to 24 months, though the exact window depends on the product and the storage conditions. Stabilizer only works on fuel that’s still in good condition: it won’t restore gas that has already gummed up or separated, so it needs to go in when the tank is filled, not months later.
Cold weather affects a generator the same way it affects a car. Oil thickens, which makes the engine harder to turn over, and a battery loses a meaningful share of its cranking power once temperatures drop. Most portable-generator manufacturers call for straight SAE 30 above 32°F, 10W-30 anywhere between -10°F and 40°F, or a full-synthetic 5W-30 year-round if the swings are wide, though the owner’s manual has the final word. Storing the battery indoors on a tender between uses helps just as much, since a cold battery is the more common reason a generator won’t crank at all.
A few rough figures show the gap between a portable setup and a full standby install, though the final number for either one depends on the home’s electrical panel, the generator’s fuel type, and local permit costs:
A portable setup covers the basics for a fraction of a whole-house system’s price, but only if it’s sized to the load it needs to carry. That means listing out the appliances and equipment needed during an outage, then checking both their running wattage and whatever extra power they draw at startup: a refrigerator, a sump pump, and a furnace blower each have different starting demands, so their own specifications matter more than one blanket multiplier.
A portable generator can run compatible equipment through properly rated cords, but supplying whole circuits in the house is a different job. That calls for a qualified electrician to install an approved transfer switch or another permitted connection system, never a cord that plugs the generator straight into a household outlet to power the home’s wiring, which risks a fire inside the house and a shock hazard for utility crews working on the lines outside.
Carbon monoxide is one of the most serious risks with generator use. Never run a portable generator inside a home, garage, basement, crawlspace, or shed, even with the doors or windows open, since that doesn’t move enough air to prevent a dangerous buildup. Run it outdoors instead, at least 20 feet from the house with the exhaust pointed away from windows, doors, and vents, and have working carbon monoxide alarms inside the home. CPSC ties nearly 100 deaths a year to portable units run too close to a building, which is why that distance matters even when a generator’s own manual lists something shorter.
Standby systems carry a similar risk from a different angle. CPSC staff research on stationary generators found that exhaust can reach much farther than the minimum clearances most generator installations use. In documented incidents, exhaust reached more than 25 feet out from the enclosure, spread at least 6 feet to either side, and rose more than 10 feet, sometimes higher where a nearby wall redirected it toward upper windows and soffit vents.
Those numbers describe what happened in specific investigated cases, not a clearance distance that applies to every property. A standby system’s placement should come from a qualified installer who checks the site’s nearby openings, the manufacturer’s requirements, and local building rules, since even a compliant minimum clearance can still let carbon monoxide into a structure under the wrong conditions.
None of this is complicated on its own. It just needs doing before the first outage of the season, not during it.
