Author: Ready Chateau

When the power goes out, the goal is not to recreate normal life. It is to keep the household safe, protect the things that matter and use limited backup power where it does the most good.

That means the first question is not, “How much can my generator or power station run?” It is, “What must keep working, and what can wait?”

Short Answer

Most households can cover a useful group of essentials with far less power than the whole house normally uses. A refrigerator, a few LED lights, phones, a modem or router and a portable fan may fit within a modest backup plan. Pumps, furnace blowers, medical equipment, cooking appliances and air conditioning require more careful planning.

Whether a load will work depends on four things:

• The power source’s continuous output
• The extra power a motor or compressor needs when it starts
• The voltage and connection the equipment requires
• How long the battery or fuel must last

A backup source can have enough watts to start a refrigerator but not enough stored energy to run it overnight. It can also have plenty of battery capacity but too little surge output to start the compressor. You have to check both power and runtime.

Power the Household in Layers

1. Protect health and immediate safety

Equipment that supports breathing, mobility, medication, temperature control or another health need comes first. Do not estimate a medical device’s requirements from a generic chart. Use its exact label and instructions, and confirm the backup plan with the device manufacturer, supplier and health-care provider.

Extreme heat or cold can also turn comfort into a safety issue. A fan may help someone feel cooler, but the CDC warns that fans alone do not prevent heat-related illness when temperatures are very high. Know where you can go if the home becomes unsafe.

2. Protect refrigeration and necessary household systems

A refrigerator or freezer is often the largest load in a basic outage plan. It cycles rather than running continuously, but its compressor can require several times more power for a moment when it starts.

A sump pump, well pump or furnace blower may be even more important in some homes. These loads often have motors, high starting demand, hardwired connections or 240-volt requirements. They should not be added to a portable setup by guesswork.

3. Keep communication and safe lighting available

Phones, a modem or router, a radio and a few LED lights usually use much less power than heating, cooling or cooking appliances. They are often the easiest loads to keep running, and they help the household receive alerts, contact others and move safely after dark.

Internet service may still be unavailable if the provider’s local equipment has lost power. Keep another way to receive emergency information.

4. Add comfort and convenience only after the essentials fit

A television, laptop, fan or small kitchen appliance may be reasonable when capacity allows. Electric heat, hot plates, toaster ovens, hair dryers and similar resistance-heating loads consume a large share of a small power station’s output and energy.

Use them only if the source, connection and runtime plan can safely support them. During a limited outage, a lower-power alternative is often the better choice.

A Quick Load Guide

These figures are planning examples, not ratings for your equipment. Check the appliance label and manufacturer’s information before relying on any backup source.

The ranges above are drawn from representative manufacturer planning examples. They show the scale of the problem; they do not replace the ratings for your equipment. A newer refrigerator, a larger pump or a different appliance may be far outside the example.

A Realistic Essential-Load Example

Suppose a household wants to run:

• A refrigerator using 200W after startup
• Four 10W LED bulbs
• A 40W portable fan
• A 15W modem and router
• Two phone chargers using 30W together

The combined running load is about 325W. That looks small, but the refrigerator may need about 1,600W for a moment when its compressor starts. If the other loads remain on, the source may need to supply roughly 1,725W during that start.

A backup source with 1,000W of continuous output but only 1,000W of surge output would not be a dependable match for this example. A source with sufficient surge capacity may operate the group, but runtime is a separate question.

For a generator, use How Much Generator Do I Need? to enter the actual running and starting figures. For a battery system, the refrigerator-runtime calculator can estimate how long the stored energy may last.

What a Portable Power Station Can Usually Handle

A portable power station is often a good fit for electronics, LED lighting, communication equipment and selected appliances that stay within its output limits. Larger stations may also operate a refrigerator, freezer, fan or certain medical devices if the exact startup, continuous-output and compatibility requirements are met.

The number marked in watts tells you how much power the station can deliver at one time. The number marked in watt-hours tells you roughly how much energy it stores. Neither number replaces the other.

A station that can start every connected load may still run out of energy quickly if it is powering a heater, cooking appliance or several devices continuously. Compare the two types of backup in Portable Power Station vs. Generator if you are still deciding which system fits your needs.

What a Portable Generator Changes

A portable generator can generally support larger or longer-running loads because it continues producing power while fuel is available. It still has output, voltage, receptacle, cord, fuel and connection limits.

Do not add loads until a generator trips and call that a plan. Overloading can shut the system down when an essential motor starts. It can also overheat an undersized cord or create other hazards.

240-Volt and Hardwired Loads Are a Separate Decision

A wattage total does not tell you whether the equipment can be connected.

Many well pumps, sump pumps, furnace blowers, central air conditioners, electric water heaters, ranges and dryers are hardwired or require 240V. Many portable power stations provide only 120V, and a generator’s full advertised output may not be available through every receptacle.

Do not improvise a connection or alter household wiring. If the outage plan includes hardwired or 240V equipment, have a qualified electrician verify the power source, voltage, transfer equipment, inlet, breaker and local requirements.

Medical Equipment Needs Its Own Plan

An electrically powered medical device should not be treated as one more row in a household wattage chart.

Ready.gov recommends talking with the medical provider about a power-outage plan for devices and refrigerated medicines. The FDA also advises checking the device instructions or contacting the distributor or manufacturer to determine whether the equipment can be used with a battery or generator.

Confirm:

• The device’s exact input and startup requirements
• Whether it requires a particular power quality, accessory or backup battery
• How long it can safely be without power
• Who to contact if the backup fails
• Where the person can go if the home becomes unsafe

Do not change treatment, disconnect equipment or substitute an unapproved power source based on a generic online estimate. Make the medical backup plan with the appropriate provider and device professionals before an outage.

Manage Loads Instead of Powering Everything at Once

The 1960s sitcom Green Acres turned the need to manage generator loads into a running joke. Oliver Douglas assigned every appliance a number because the farmhouse generator could support only so much at once, and Lisa kept choosing combinations that exceeded the limit. The comedy was exaggerated; the electrical lesson was not. During a real outage, the same idea is called load management.

Think of a generator or power station as a power budget. The refrigerator, pump and essential equipment get first claim. A coffee maker, microwave, television or other convenience load can take a turn when the plan leaves enough room for essential equipment to restart.

Start large motors separately. Turn off a microwave, coffee maker or other high-draw appliance while a pump or refrigerator is starting. Charge phones and battery packs when other demand is low. Keep refrigerator and freezer doors closed so the compressors do not have to work as hard.

Remember that some equipment restarts automatically. A refrigerator, freezer, pump or furnace blower can switch on while another appliance is operating. If two large loads could start together, the source and connection plan must account for it or reliably prevent it.

Load management is not permission to exceed a rating. Every operating combination must remain within the limits of the power source, receptacle, cord, inlet and transfer equipment.

Make Your Outage Load List Before You Need It

Use this process while the power is still on:

• Divide equipment into “must run,” “helpful” and “can wait.”
• Record the voltage, running watts and starting watts from the label or official manual.
• Mark every motor, compressor, 240V load and hardwired connection.
• Add the running demand for equipment that may operate together.
• Add the largest realistic startup demand.
• Compare the result with every limit in the power path.
• Estimate how long the battery or fuel must last.
• Test the exact setup under safe, supervised conditions.

If a rating or connection is unclear, stop and verify it with the manufacturer or a qualified professional. Guessing low does not make the load smaller.

Bottom Line

During an outage, a few carefully chosen loads can do more for the household than trying to power everything.

Protect health first. Keep refrigeration, communication and safe lighting available. Add fans, electronics and short-use appliances only when capacity allows. Treat pumps, medical devices, hardwired equipment and 240V loads as special cases that require exact information.

Then calculate with the real ratings, plan the runtime and test the setup before the next outage.

If you are building the rest of the household plan, start with What to Do When the Power Goes Out.

Short answer

A portable power station can run a refrigerator for a few hours, overnight, or longer than a day. The answer depends on the station’s usable battery capacity and the refrigerator’s actual energy use—not the size of your home or the largest watt number on the appliance label.

For example, a 1,024Wh power station with about 85% usable AC energy is estimated to run a refrigerator rated at 500kWh per year for about 11 hours when the calculation includes a 20% operating allowance and 10W of station idle draw. Your result may be very different.

The safest way to plan is to answer two separate questions:

1. Can the power station start and continuously run the refrigerator?
2. If it can, how long will the battery last?

First, make sure the station can run the refrigerator

Battery capacity and AC output are not the same thing. Battery capacity is measured in watt-hours, or Wh. It tells you how much energy the station stores. AC output is measured in watts, or W. It tells you how much power the station can deliver at one time.

A station may have enough watt-hours for a long runtime but still shut down when the refrigerator compressor starts. Before relying on it, compare:

• The station’s continuous output with the refrigerator’s running watts.
• The station’s surge output with the refrigerator’s starting watts.

Use ratings from the refrigerator manufacturer, power-station manufacturer, or a meter that can capture startup demand. If you cannot verify starting watts, do not assume the station will handle them. Test the exact combination before an outage.

If a portable battery is not the right fit for the loads you need to cover, review Portable Power Station vs. Generator. If you are considering a fuel-powered generator, use How Much Generator Do I Need? to size it correctly.

Use energy consumption—not maximum watts—to estimate runtime

A refrigerator does not draw the same amount of power all day. Its compressor cycles on and off, and defrost heaters, fans, ice makers, room temperature, and door openings all affect energy use.

That is why a sticker showing running or maximum watts is a poor runtime estimate. It describes power at a moment in time, not the energy used over a full day.

The better starting point is one of these:

• Annual energy use in kWh/year from the yellow EnergyGuide label or the model’s official EPA ENERGY STAR listing.
• Measured energy use in kWh over at least 24 hours. A longer measurement is better when conditions vary.

The annual figure is still an estimate. Actual consumption changes with the refrigerator, room temperature, door openings, settings, age, condition, and how much warm food is added.

Refrigerator runtime calculator

Enter the power station’s battery capacity and your refrigerator’s annual or measured energy use. The calculator also lets you account for usable AC energy, station idle draw, other continuous loads, and a real-world operating allowance.

The result is a planning estimate. It assumes the station is not being recharged by a wall outlet, vehicle, or solar panels while it is operating.

How the calculator works

The calculation starts by converting the refrigerator’s annual energy figure into average daily energy use:

Daily refrigerator energy (Wh) = annual kWh × 1,000 ÷ 365

It then adds the operating allowance you selected and converts daily energy into an average 24-hour load. Station idle draw and any other continuous loads are added before the usable battery energy is divided by the total average load.

Estimated runtime (hours) = usable battery Wh ÷ total average load W

The calculator defaults to 85% usable AC energy as a planning estimate. That value accounts broadly for energy that does not reach the appliance, but it is not universal. Use tested or manufacturer information for your power station when available.

Worked example

Assume the following:

• Power station capacity: 1,024Wh
• Usable AC energy: 85%
• Refrigerator EnergyGuide rating: 500kWh/year
• Extra refrigerator-use allowance: 20%
• Station idle draw: 10W
• Other loads: 0W

The station has about 870Wh of usable energy. The refrigerator’s label works out to about 1,370Wh per day before the allowance and about 1,644Wh per day after it. That is an average refrigerator load of roughly 68.5W. Adding 10W of station idle draw produces a total average load of about 78.5W.

870Wh ÷ 78.5W = about 11.1 hours

This example does not promise that every 1,024Wh station will run every refrigerator for 11 hours. It shows how the inputs change the answer.

What can shorten runtime?

• Hot rooms. A refrigerator in a hot kitchen or garage may run more often.
• Frequent door openings. Every opening lets cold air out and warm, humid air in.
• Warm food. Adding a large amount of unfrozen or warm food increases the cooling load.
• An older or poorly maintained refrigerator. Dirty condenser coils, worn door seals, and mechanical problems can increase energy use.
• Battery temperature and age. Available battery energy can change with condition and operating temperature.
• Station idle draw. The inverter, display, fans, and internal electronics use energy even when the compressor is off.
• Other connected devices. A router, lights, chargers, or another appliance will reduce refrigerator runtime.

How to make the battery last longer

• Keep the refrigerator and freezer doors closed as much as possible. Decide what you need before opening the door.
• Disconnect nonessential loads. Reserve the station for refrigeration and truly necessary devices.
• Start with a fully charged station and verify the battery’s state of charge before severe weather.
• Keep the refrigerator maintained. Follow the manufacturer’s instructions for cleaning coils, checking airflow, and inspecting door seals.
• Test before you need it. Run the refrigerator from the station under supervision and record the battery percentage over several hours. A real test of your equipment is more useful than a generic online estimate.

Frequently asked questions

Will a 1,000Wh power station run a refrigerator overnight?

It may, but the battery-capacity number alone cannot answer the question. Use the refrigerator’s annual or measured energy use, include station losses and idle draw, and confirm that the station can handle the compressor’s starting surge.

Is a 2,000W power station the same as a 2,000Wh power station?

No. A 2,000W rating describes output power. A 2,000Wh rating describes stored energy. You need enough output to start and run the refrigerator and enough stored energy for the runtime you want.

Can I run a refrigerator and a router at the same time?

Yes, if their combined running and startup demands stay within the station’s ratings. Add the router and any other continuous loads to the runtime calculator because they reduce how long the battery lasts.

Will solar panels keep the refrigerator running indefinitely?

Not necessarily. Solar production changes with weather, season, shade, panel position, and the station’s charging limits. Treat solar as a possible energy input, not a guarantee of continuous operation.

Bottom line

Do not choose refrigerator backup by watt-hours alone. First verify that the power station’s continuous and surge output can operate the refrigerator. Then estimate runtime from annual or measured energy use, include station losses and idle draw, and test the setup before an outage.

A calculator can give you a useful planning number. Your own refrigerator, power station, room conditions, and usage determine the real result.

Shopping for a generator by house size sounds simple. A small house needs a small generator, a large house needs a large one and somewhere in the middle is the right answer for everyone else.

That shortcut does not work very well.

A 2,500-square-foot home with gas heat, gas water heating and a plan to power only the refrigerator, lights and phones may need less backup power than a much smaller all-electric home with a well pump, electric heat and medical equipment.

The right generator size depends on what your household actually needs to run—not the number of bedrooms or square feet.

The Short Answer

List the equipment you need during an outage. Add the running watts for everything that may operate at the same time. Then account for the additional power that the largest motor or compressor may require when it starts.

After that, confirm that the generator provides the correct voltage, enough output on the fuel you intend to use and a safe way to connect the equipment.

That calculation can help you estimate a portable generator for ordinary household essentials. If your plan includes central air conditioning, electric heat, a well pump, medical equipment, several large motors or most of the house, have a qualified electrician or generator professional confirm the size and connection system.

Decide What Needs Power

Do not start with the house’s square footage. Start with the outage you are planning for and the loads that protect health, safety and the home.

For many households, the first list includes:

• A refrigerator or freezer
• Necessary medical equipment
• A sump pump, well pump or furnace blower
• A limited amount of lighting
• Phones, radios and internet equipment
• Fans, a window air conditioner or another practical cooling plan
• Anything else the household cannot safely go without

Then separate essentials from conveniences. A microwave may be useful, but it does not have to run while a pump is starting. A clothes dryer may matter during a long outage, but it may not justify enough generator capacity to operate normally. Managing when equipment runs can reduce generator size, fuel use and cost.

If you are still deciding whether a fuel-powered generator is the right backup system, compare a portable power station and a generator before sizing either one.

Choose How Much of the House You Want to Power

Most backup-power plans fall into one of three levels:

• Plug-in essentials: A portable generator supplies a refrigerator, freezer, lights, chargers and other modest equipment through properly rated extension cords. This generally does not cover hardwired loads.
• Selected circuits: A qualified electrician installs approved transfer equipment and a power inlet so the generator can supply chosen household circuits. This also makes deliberate load management easier.
• Whole-home operation: Heating, central cooling, cooking and water heating can move the project beyond a simple portable-generator calculation. A standby system should be evaluated as one professionally installed electrical and fuel system.

Understand Running Watts and Starting Watts

Running watts are the power an appliance uses after it is operating. Starting watts—also called surge watts—describe the brief increase some motors and compressors need when they start.

Your generator must support the combined running load and a realistic startup event while the other planned loads are operating. This is why adding only running watts can produce a generator that looks adequate but trips or stalls when a refrigerator, pump, furnace blower or air conditioner starts.

Wattage charts use “starting watts” in two different ways. Some list the appliance’s total demand during startup. Others list only the additional watts above its normal running load.

For example, an appliance that uses 300 running watts and 1,200 total starting watts needs 900 additional watts during startup:

1,200 total starting watts − 300 running watts = 900 additional starting watts

If a chart already provides additional starting watts, do not subtract the running watts again. Always follow the definition used by the equipment manufacturer or calculator.

Where to Find the Wattage

Use actual equipment information whenever possible. Check:

• The appliance identification label or nameplate
• The owner’s manual
• The manufacturer’s official specifications
• The generator manufacturer’s sizing guide
• A qualified electrician, HVAC professional or equipment dealer for hardwired or high-demand loads

Generic wattage charts are useful for an early estimate, but they should not be treated as the exact requirement for every refrigerator, pump or air conditioner. Honda’s wattage guide and Champion’s wattage chart both show how widely common household loads can vary.

Some labels provide volts and amps instead of watts. Manufacturer guides sometimes estimate watts by multiplying volts by amps. That can be a useful planning shortcut for simple loads, but alternating-current motors and compressors introduce starting demand and other factors that the shortcut may not capture accurately.

If the label is unclear—or the equipment is hardwired—do not guess.

Common Household Wattage Estimates

The figures below are useful for early planning. They are not model-specific ratings. Use the appliance nameplate, owner’s manual or manufacturer’s specifications when available.

The “total starting watts” column is the appliance’s approximate total demand during startup—not just the extra surge above its running load. “Same as running” means the chart does not assign a separate startup surge. Voltage still must be checked separately, especially for pumps, water heaters and other hardwired equipment.

How to Calculate Your Generator Requirement

Use this process for an initial estimate:

• List every appliance and device you expect to power.
• Record its voltage, running watts and total starting watts. Note whether a source gives total or additional starting watts.
• Decide which loads may operate at the same time and add their running watts.
• Find the largest additional startup demand likely to occur while the other loads are running.
• Add that startup demand to the simultaneous running total.
• Compare the result with the generator’s running and surge ratings, voltage, receptacles, breaker limits and output on the fuel you will use.

Do not plan to operate continuously at the absolute edge of the rating. Follow the manufacturer’s sizing guidance rather than applying an unsupported universal percentage.

Generator Sizing Calculator

Use the calculator on this page to add the appliances and devices that may run at the same time. Choose a built-in estimate or replace it with information from your own equipment.

The calculator reports the simultaneous running load, an estimated peak with the largest single startup event, a more conservative all-motors-start estimate and a warning for 240-volt loads.

Treat the results as planning figures—not a generator recommendation. Compare them with the generator’s fuel-specific running and surge ratings, voltage, receptacles, breakers and connection equipment.

A Simple Household Example

Suppose a household plans to run a refrigerator, freezer, LED lights, internet equipment, chargers and a portable fan. Its estimated loads are:

• Refrigerator: 300 running watts; 1,200 total starting watts
• Freezer: 300 running watts; 1,000 total starting watts
• All other selected loads: 300 running watts

The simultaneous running load is 900 watts. The refrigerator adds the largest startup demand: 1,200 total starting watts minus 300 running watts, or 900 additional watts.

The estimated peak is therefore 900 running watts plus 900 additional starting watts, or approximately 1,800 watts.

That is a planning figure, not a recommendation to buy a generator labeled 1,800 watts. Actual equipment data, automatically cycling loads, voltage, connection limits and the manufacturer’s recommended allowance still matter. If the refrigerator and freezer could start together, account for that possibility or manage the loads.

Check the Generator, Not Just the Total Watts

A generator can have enough advertised wattage and still be wrong for the job. Before buying, check four things:

• Voltage: A 240-volt load requires a generator and connection system that provide compatible 240-volt power. An adapter cannot create voltage or capacity.
• Fuel rating: Dual- and tri-fuel generators may produce less power on propane or natural gas than on gasoline. Use the rating for the fuel you expect to burn.
• Continuous and surge output: Compare normal household demand with running watts and motor-starting demand with surge watts.
• The complete power path: Receptacles, breakers, cords, power inlets and transfer equipment can limit how much power reaches the load.

Generac’s guidance on portable-generator power limits illustrates why the largest number on the box may not be available through every protected receptacle. The generator is only one part of the system; every component between it and the appliance must be appropriate for the load.

If the plan includes a well pump, electric water heater, range, dryer, central air conditioner or other hardwired 240-volt equipment, have a qualified electrician verify the generator and connection plan.

Use Load Management Before Buying More Generator

You may not need to operate everything at once. A microwave, coffee maker or water heater can usually wait while a pump or compressor starts.

Honda’s sizing guidance shows how starting large loads at different times can allow a smaller generator to serve more equipment. Manual load management may be as simple as turning one appliance or circuit off before using another.

The plan still has to be realistic. Refrigerators, freezers, pumps and furnace blowers can restart automatically. If two large motors can start together, include that possibility in the calculation or use a dependable system that prevents it.

A smaller generator can cost less, use less fuel and be easier to move. The tradeoff is paying closer attention to what is running.

When to Stop Calculating and Call a Professional

A homeowner worksheet is useful for understanding the problem. It is not a substitute for professional sizing when the project includes:

• Central air conditioning or a heat pump
• Electric resistance heat or electric water heating
• A hardwired well pump, sump pump or furnace with uncertain starting data
• Medical equipment that cannot safely lose power
• Several large motors that may start together
• A connection to household wiring
• Whole-home standby operation
• A service panel, fuel supply or load requirement you do not understand

A qualified electrician can verify the actual loads, voltage, transfer equipment, inlet, breaker and local requirements. A standby-generator professional can also evaluate fuel supply, equipment placement and load-management options.

Generator Sizing Checklist

Before choosing a generator, confirm that you have:

• Listed the loads that truly need power
• Used actual running, total starting and voltage information where available
• Calculated what may run at the same time and allowed for realistic motor starts
• Checked the generator’s ratings for the fuel you will use
• Checked receptacle, breaker, cord, inlet and transfer-equipment limits
• Decided how large loads will be managed
• Obtained professional help for hardwired, high-demand, medical or whole-home loads and planned a safe connection and operating location

Buy for the Plan, Not the House

The right generator is not the one assigned to your square footage by a generic chart.

It is the one that can safely support the electrical loads your household has decided are important—without depending on wishful math, an incompatible connection or more fuel than you can reasonably store and obtain.

Start with the loads. Calculate the running and starting demand. Check the voltage, fuel rating and connection limits. Manage what does not need to run at the same time.

Then choose the generator.

Once you own it, the work is not finished. Learn why a generator may not start after sitting and how often to run your generator so the equipment you sized carefully is actually ready when the power goes out.

A portable generator can keep refrigerators cold, charge essential devices and power equipment your household depends on during an outage.

It can also create carbon-monoxide, electrical and fire hazards when it is placed, connected or refueled incorrectly.

Most generator accidents do not happen because someone intended to take a dangerous risk. They happen because the power is out, the weather is bad and someone is trying to get the lights back on quickly.

That is why generator safety should be worked out before the outage—not while standing outside in the dark with a machine you have not used since the last storm.

This guide focuses on the mistakes that matter most and the practical steps that help prevent them.

Start With the Generator’s Manual

Portable generators are not all designed or wired the same way.

Before operating yours, read the manufacturer’s instructions for:

• Safe placement and required clearances
• Grounding
• Weather protection
• Extension cords
• Electrical capacity
• Starting and shutdown
• Refueling
• Maintenance and storage

Keep the manual where you can find it during an outage.

If the original manual is missing, find the generator’s model number on its identification label and search the manufacturer’s official website. Look for a section labeled Support, Manuals, Product Documentation or Downloads.

Confirm that the model number on the manual matches your generator exactly before following its instructions. If the manual is no longer available online, contact the manufacturer or an authorized dealer.

Avoid relying on an unofficial manual-download site when the manufacturer’s version is available.

General safety guidance is important, but it does not replace the instructions for your particular generator.

Never Run a Portable Generator Indoors

A fuel-burning generator produces carbon monoxide, or CO. Carbon monoxide cannot be seen or smelled, and it can build up quickly enough to cause illness, unconsciousness or death.

Never operate a portable generator in:

• A house
• A garage
• A basement
• A crawlspace
• A shed
• A porch
• A carport or breezeway
• Any other enclosed or partially enclosed space

Opening the garage door does not make the garage safe. Opening windows or placing fans nearby does not make an indoor location safe either.

The generator belongs outside.

The CDC says generators should be operated outdoors more than 20 feet from windows, doors and vents. Point the exhaust away from the home and from openings that could allow fumes inside.

That distance is not permission to place the generator anywhere a cord happens to reach. Consider the direction of the exhaust, nearby buildings and whether fumes could enter a neighbor’s home.

Do not move the generator closer because an extension cord is too short. Use an appropriately rated cord that allows the generator to remain in a safe location.

Use Working Carbon-Monoxide Alarms

Correct generator placement is the first defense against carbon monoxide. Working CO alarms provide another important layer of protection.

Use battery-operated CO alarms or plug-in alarms with battery backup. Battery backup matters because an ordinary plug-in alarm may not work during the same outage that caused you to use the generator.

Install CO alarms on every level of the home and outside sleeping areas, following the alarm manufacturer’s instructions. Test them regularly and replace batteries or the alarm itself when required.

Do not place a generator closer to the house because you have CO alarms. An alarm is a warning device, not a substitute for safe placement.

Never Backfeed Power Through a Wall Outlet

Never try to power your house by connecting a generator to an ordinary wall outlet.

This practice—often called backfeeding—can send electricity into household wiring and out onto utility lines. It can injure or kill utility workers, neighbors or anyone who encounters wiring believed to be de-energized. It can also damage the generator or household electrical system and create a fire hazard.

A homemade cord with male plugs on both ends is especially dangerous and should never be used.

There are two basic ways to use portable-generator power:

1. Connect selected appliances directly to the generator with properly rated extension cords, following the generator and appliance instructions.
2. Connect the generator to designated household circuits through approved transfer equipment installed by a qualified electrician.

Transfer equipment isolates generator power from utility power and prevents dangerous backfeeding. Requirements vary with the generator, electrical system and local rules, so connecting a generator to household wiring is not a do-it-yourself project.

The Electrical Safety Foundation International recommends having transfer equipment installed by a qualified electrician.

If you want the generator to supply household circuits, arrange the installation before an outage. Consult a qualified electrician and, where appropriate, your utility or local code authority.

Use the Right Extension Cords

An extension cord becomes part of the electrical system while the generator is running. A household cord chosen only because it is nearby may not be suitable.

Use cords that are:

• Intended for outdoor use
• Grounded and equipped with three-prong plugs
• Rated to carry the connected electrical load
• Long enough to preserve safe generator placement
• Free from cuts, crushed areas, exposed conductors and damaged plugs
• Used according to the generator and appliance instructions

A cord that is too light for the load can overheat. A damaged cord can create a shock or fire hazard.

Do not run cords through standing water or place connections where they can become wet. Protect cords from vehicle traffic, sharp edges, closed doors and other locations where they could be crushed or damaged.

Do not remove a grounding pin to make a plug fit.

The generator’s grounding requirements depend on its design and how it is connected. Follow the manufacturer’s instructions rather than assuming that every generator requires the same grounding arrangement.

Keep the Generator and Connections Dry

Generators are often needed because of hurricanes, thunderstorms, ice storms or other conditions that also bring rain and moisture.

Electricity and water are a dangerous combination.

The Occupational Safety and Health Administration advises keeping portable generators dry and not operating them in rain or wet conditions. Never handle the generator’s electrical components with wet hands or while standing in water.

Follow the generator manufacturer’s instructions for protection from rain and snow. Any operating cover or shelter must be approved or specifically permitted for use with your generator and must preserve all required ventilation, exhaust direction and clearances.

Do not drape a tarp over a running generator or improvise an enclosure around it.

Most importantly, do not solve the rain problem by moving the generator into a garage, shed, porch or other enclosed or partially enclosed space. That replaces an electrical hazard with a carbon-monoxide hazard.

Plan for safe weather protection before the storm. If you cannot keep the generator dry while also meeting its outdoor placement and clearance requirements, do not operate it until conditions allow safe use.

Do Not Overload the Generator

A generator can supply only a limited amount of power.

Connecting more equipment than it can support may trip its protection, damage appliances, overheat cords or create a fire hazard. Some appliances also require more power when they start than they use while running.

Before an outage, identify what you actually need to operate. For many households, that might include:

• A refrigerator or freezer
• A few lights
• Phone chargers
• A modem or router
• Necessary medical equipment
• A limited number of other essential devices

Find the running and starting requirements for the equipment you intend to connect. Make sure the combined load remains within the generator manufacturer’s limits.

If you are uncertain about your needs, our comparison of a portable power station versus a generator explains the factors to evaluate before choosing a backup-power system.

A generator does not have to power the entire house to be useful. Managing a few essential loads safely is better than overloading the generator while trying to recreate normal life.

Shut Down and Cool the Generator Before Refueling

Gasoline and other generator fuels require careful handling.

A running generator becomes hot. Spilled fuel can ignite if it contacts the engine, muffler or another hot component.

Before refueling:

1. Disconnect or turn off electrical loads according to the generator instructions.
2. Shut down the generator.
3. Allow it to cool as directed by the manufacturer.
4. Refuel outdoors using the correct fuel and an approved container.
5. Clean up any spill according to the manufacturer’s instructions before restarting.

Never refuel a generator while it is operating or still hot.

Store fuel outside living areas in approved, properly labeled containers. Keep it away from flames, pilot lights, electrical equipment and other ignition sources. Follow local rules governing the type and amount of fuel that may be stored.

Do not assume that a garage is automatically a safe fuel-storage location. Fuel vapors can travel and ignite when they reach a pilot light, switch or another ignition source.

Fuel also ages. A safe generator plan includes knowing how the manufacturer says to store both the machine and its fuel between outages.

Our guide to why a generator may not start after sitting explains why storage and maintenance matter before the next emergency.

Keep the Generator Away From Combustible Materials

Portable generators produce heat in addition to exhaust.

Operate the generator on a stable surface with the clearance required by its manufacturer. Keep leaves, cardboard, stored fuel and other combustible materials away from the engine and muffler.

Do not place the generator where dry grass, storm debris or other material could contact a hot component.

Keep children and pets away from the operating area. A generator can have hot surfaces, exposed cords, fuel and moving components even when it does not look especially dangerous.

Remember that the engine and muffler may remain hot after shutdown.

Inspect the Generator Before Every Use

An outage is not the time to discover that a cord is damaged, fuel is leaking or the generator has not been maintained.

Before starting it, check for:

• Fuel or oil leaks
• Loose or damaged parts
• Blocked air inlets or exhaust
• Damaged receptacles
• Frayed or unsuitable extension cords
• Deteriorated fuel lines
• Pest nests or debris
• Correct oil and fuel levels
• Maintenance that is due

Do not operate a generator that is leaking fuel, smoking unexpectedly, producing unusual odors or showing signs of electrical or mechanical damage.

If you do not understand what you are seeing, stop and consult the manual, manufacturer or a qualified service professional.

A brief pre-use inspection does not replace scheduled maintenance. Start, maintain and test the generator according to its instructions so that you know whether it works before the next outage.

Continue Monitoring the Generator While It Runs

Conditions around a generator can change after it starts.

Periodically confirm that:

• The generator remains dry and stable.
• Exhaust is still directed safely away.
• Cords and connections have not become wet or damaged.
• Fuel or oil is not leaking.
• The electrical load remains within capacity.
• Children, pets and other people cannot enter the operating area.
• Wind, water, debris or other conditions have not made the location unsafe.

Follow the manufacturer’s instructions concerning supervision, shutdown and overnight operation. Do not assume that a generator can be started and forgotten until morning.

Prepare the Safe Setup Before You Need It

A generator should not be an unopened machine that comes out for the first time after the lights go off.

Before the next outage:

• Read the correct manual.
• Choose a safe outdoor operating location.
• Measure more than 20 feet from doors, windows and vents.
• Point the exhaust away from buildings and openings.
• Determine how you will keep the generator dry without enclosing it.
• Install and test CO alarms.
• Obtain properly rated extension cords.
• Calculate the electrical loads you plan to connect.
• Arrange approved transfer equipment if the generator will supply household circuits.
• Store fuel safely.
• Inspect, maintain and test the generator as directed.

If any part of the setup depends on guesswork during an emergency, solve it now.

The Ready Chateau Generator Safety Rule

A generator is useful only when it can be operated without creating a greater emergency than the outage itself.

Keep it outside. Keep it more than 20 feet from doors, windows and vents. Point the exhaust away. Keep the generator and connections dry. Connect it correctly. Refuel it only after shutdown and cooling. Never backfeed power into household wiring.

Most importantly, decide how you will use it safely before the power goes out.

If you are still developing your outage plan, begin with what to do when the power goes out. Then test your generator, review its manual and correct any missing part of your setup while you still have light, time and working electricity.