WHEN THE POWER GOES OUT · GENERATORS
Three generator types, each right for a different situation. One safety rule that is not optional. And the fuel and wiring details that determine whether yours actually works when you need it.
CARBON MONOXIDE SAFETY — READ BEFORE ANYTHING ELSE
Carbon monoxide is odorless and colorless. A generator running in an enclosed space produces enough CO to be lethal within minutes. Every year in the US, dozens of people die from generator CO poisoning during and after storms — most in their homes or garages.
Non-negotiable rules
If a CO alarm sounds
Leave immediately. Do not stop to turn off the generator. Do not go back for belongings. Call 911 from outside. Do not re-enter until cleared by emergency services.
CO alarms belong on every level of the house and outside sleeping areas. Test them monthly. Replace them every 5–7 years.
THREE TYPES
Portable, inverter, and standby generators are different tools. The right choice depends on what you need to run, how often you expect to use it, and how much wiring work you want to do.
Put numbers on what you need to run
The right generator depends first on load, and load is where most people guess. The calculator works out the running watts and startup surge a household actually draws, from figures traced to DOE and Cooperative Extension rather than to generator sellers.
Open the Power Needs Calculator$400–$1,200
The most common choice. Runs on gasoline (or dual fuel). Provides 2,000–8,000 watts. Powers appliances through extension cords or, with a transfer switch, directly into a home circuit.
Loud. Burns 0.5–1 gallon of fuel per hour at half load. Requires manual starting and regular runtime during storage (every 90 days) to keep the carburetor clean.
Best for: occasional outages, larger loads, lower upfront cost. Not for sensitive electronics without a surge protector.
$700–$2,000
Produces clean, stable power by converting AC to DC and back. Safe for laptops, medical devices, and electronics. Quieter than a portable. More fuel-efficient — throttles engine speed to match the load.
Lower wattage ceiling (1,000–4,500W for most models) and higher cost per watt. Two units can be parallel-linked for double the output.
Best for: electronics, CPAPs, quiet neighborhoods, RV use, and households with sensitive equipment.
$3,000–$15,000+ installed
Permanently installed, connected to natural gas or propane, and starts automatically within seconds of a grid outage. No fuel hauling, no manual starting, no extension cords.
Requires professional installation including a transfer switch and utility disconnect. Annual servicing recommended. The right choice for households with ongoing medical needs or frequent multi-day outages.
Best for: medical equipment, frequent outages, households that cannot be without power for any period.
When you are ready to compare specific models, our portable generator review covers current picks, real fuel numbers, and honest tradeoffs.
FUEL STORAGE
After a major storm, gas stations lose power along with everyone else. A generator with no fuel is a very expensive paperweight. Store fuel before the next outage, not during it.
A 3,500W generator at half load burns roughly 0.5 gallons per hour. Fifteen gallons provides 30 hours of runtime — enough for three to four days at 8 hours of daily use.
Local fire codes typically limit residential gasoline storage to 25 gallons. Check your jurisdiction before storing more than 10 gallons.
Dual-fuel generators that run on both gasoline and propane give you flexibility. Propane stores indefinitely without degradation, which makes it a better long-term storage fuel.
Untreated gasoline degrades in 30 days and can gum a carburetor within 60. Add a fuel stabilizer when you fill the containers, and again when you top off the generator tank. Treated fuel stays usable for 12–24 months.
Use approved fuel containers — red for gasoline, blue for kerosene. Store them outside the living space, away from ignition sources, and out of direct sun.
Rotate stored fuel annually. Run the old fuel in your car or lawn equipment rather than letting it sit and degrade.
STRETCHING EVERY GALLON
A generator does not need to run around the clock to keep a household functional. The most fuel-efficient pattern pairs it with a battery station and lets each tool do what it does best.
Run the generator for one to two hours at a time. In that window, pull the refrigerator and freezer back down to temperature, recharge the battery station, and top off phones and power banks. Then shut it down. A closed refrigerator coasts between runs, and an appliance thermometer tells you when the next run is due. The refrigerator guide covers that schedule in detail.
The station carries the quiet loads while the generator sits off: router, CPAP, lights, and overnight charging. Households running this pattern burn a few gallons a day instead of a tankful, get silent nights, and put far fewer hours on the engine.
A large battery station charging at full speed can demand 1,500W or more. Ask that of a 2,000W generator that is also carrying the refrigerator and the overload protection trips. Many stations let you lower their AC charging speed in settings or a companion app. Set the charge rate comfortably below the generator's continuous rating, with headroom for everything else plugged in.
An inverter generator is the better charging source, since its output is clean enough for the station's electronics. Sizing and choosing the station itself is covered in the portable power station guide.
WIRING IT IN SAFELY
Extension cords from a generator to individual appliances work. Connecting a generator directly to your home's wiring without a transfer switch is illegal in most jurisdictions and hazardous to utility workers.
A manual transfer switch is installed at your main panel by a licensed electrician. When you need generator power, you flip the switch to disconnect from the grid and connect the generator.
Cost: $200–$800 for the hardware plus electrician labor. The switch lets you safely run selected circuits — lights, refrigerator, furnace blower — from the generator without extension cords running through the house.
A simpler option: a generator-ready inlet with a male plug installed on the outside of the house. Same principle, lower cost.
Required for standby generators. Monitors grid power and starts the generator automatically within seconds of detecting an outage — then transfers power to the home circuit without any human action.
Cost: included with most standby generator installations, or $300–$1,000 added to a portable setup. Requires a licensed electrician and, in most jurisdictions, a permit.
Never attempt to connect a generator to household wiring without a proper transfer switch. Backfed power on utility lines has killed lineworkers. This is a legal and safety requirement, not a preference.
RELATED GUIDES