Safety review, August 9, 2026: Bemo Editorial manually checked the medical-device, carbon-monoxide, electrical, and food-safety language in this guide against the linked FDA, CDC, CPSC, and emergency-management sources. This guide supports planning; it does not replace instructions from your clinician, device manufacturer, utility, electrician, fire department, or local authorities.
The best blackout setup for most households is layered. Start with battery LED lighting, a charged phone power bank, food-temperature monitoring, and an offline contact plan. Add a UPS when a device must not reboot. Add a portable battery power station for selected longer-running loads. Consider a fuel generator or professionally installed standby system only when you need substantially more power and have a location and electrical setup that meet every safety requirement.
CPSC says fuel-burning generators should operate outdoors at least 20 feet from the home, with exhaust directed away from it.[3] A garage, basement, porch, balcony, open window, or enclosed courtyard is not automatically a safe generator site. If you cannot meet the manufacturer’s instructions, official clearance guidance, property rules, and local requirements, do not use one there.
This guide combines current US agency guidance with practical load planning. Property conditions, local codes, utility programs, insurance policies, and personal medical requirements vary, so verify each before relying on a solution.
The blackout plan in one table
The key is to separate continuity from runtime. A UPS can keep a desktop or router from dropping during a brief interruption, but a modest USB battery may hold more useful phone charges. A large power station can store much more energy, but paying for it makes little sense when your plan is only light and communication.
Start with consequences, not products
A blackout kit should answer what happens in your household when the outlet stops working. Make this list before shopping:
- What must stay on without interruption?
- What can be off for 10 minutes, four hours, or overnight?
- Which need becomes unsafe rather than merely inconvenient?
- Which devices have their own batteries?
- Where will every person and pet go if the home becomes too hot or cold?
- Who can enter the building, operate the elevator, or provide help if cellular service is congested?
Ready.gov recommends planning for medical devices and refrigerated medicines, learning how long backup batteries last, and having alternative phone-charging methods.[1] Your physical plan should also include wells or building water pumps, sump pumps, garage doors, electronic entry, elevators, and any shared life-safety systems. Ask the responsible utility, installer, landlord, homeowners association, or property manager what is backed up and for how long. Do not infer that one working system means the rest of the property is energized.
| Priority | Household plan | Power approach |
|---|---|---|
| Light and safe movement | Lanterns where people sleep, at the main exit, and near the bathroom | Replaceable batteries or rechargeable lights plus a backup set |
| Alerts and communication | Charged phone, weather alerts, building contacts, radio if appropriate | USB power bank first; power station for longer events |
| Medical needs | Device-specific plan made with provider, manufacturer, utility, and local services | Manufacturer-approved battery or backup source, tested before an outage |
| Food and medicine temperature | Appliance thermometers, closed doors, cooler and ice plan | Battery only after measuring load and confirming startup requirements |
| Internet and work | Know whether the provider network stays up; save offline copies of essentials | UPS for seamless transition or DC/AC battery backup for runtime |
| Heating and cooling | Weatherization, safe clothing, fans, hydration, and a relocation threshold | Do not make resistive heat or AC the default battery load |
Level 1: the no-regrets blackout kit
Buy the boring items first. They are inexpensive, portable to your next home, and useful even if you later add a power station.
LED lighting instead of candles
Put a lantern or flashlight where you can reach it from bed and another near the main living area. A headlamp is useful when checking a breaker panel or carrying supplies because it leaves both hands free. Choose lights with a low mode, since maximum brightness consumes batteries faster and can be unpleasant in a small room.
Candles add an open flame when rooms are dark and people are moving around. CDC recommends battery-powered flashlights and lanterns instead of candles, gas lanterns, or torches to reduce fire risk.[4] A battery lantern avoids that failure mode entirely.
Phone power that works without an outlet
A USB power bank is usually the highest-value backup purchase. Keep the matching cable with it, label it, and set a recurring reminder to recharge it. If two people use different connectors, store both cables. Test that the bank actually charges each phone.
Use airplane mode, low-power mode, and a dimmer screen when connectivity is intermittent. A phone searching continuously for a weak signal can consume power quickly. Save important phone numbers, maps, insurance details, and building contacts offline.
Water, food, radio, and cash
Backup electricity is not a complete emergency kit. Ready.gov’s basic kit includes water, nonperishable food, a battery-powered or hand-crank radio, flashlight, first-aid supplies, extra batteries, a manual can opener, local maps, and other household-specific items.[2] Add pet supplies, infant supplies, medications, sanitation items, and accessible equipment as your household requires.
Use the room-by-room Power Outage Emergency Kit Checklist to turn those categories into a tested household system.
Cash can matter when nearby stores have power or communications failures. Keep a modest amount securely rather than assuming every card terminal or ATM will work.
Level 2: use a UPS for continuity
A UPS is for equipment that should not lose power at the instant the grid fails. Good household use cases include:
- a modem and router that continue receiving provider service;
- a desktop computer that needs time to save work and shut down;
- network storage that should shut down cleanly;
- a small home-office setup where a short interruption is common.
For product selection and network-specific outlet planning, see Best UPS for a Modem and Router During a Power Outage. If you already own a UPS, calculate and test its router runtime before relying on the display estimate.
Do not size a UPS from its volt-amp number alone. Compare its supported wattage and the manufacturer’s runtime curve at a load near yours. A UPS rated for a high peak load may still provide only a few minutes at that load.
Also ask whether continuity is necessary. A laptop already contains a battery. Pairing the modem and router with backup may be more useful than putting the laptop charger on the UPS. If neighborhood cable or fiber equipment also loses power, your local router can stay lit while the internet remains unavailable.
Level 3: size a portable power station correctly
Portable power stations combine a rechargeable battery, charge controller, ports, and usually an AC inverter. They produce no combustion exhaust during use, which makes them suitable for indoor use when operated and stored according to their instructions. They are not unlimited power, and their published battery capacity is not the same as energy delivered to every outlet.
Two ratings answer different questions:
- Watts (W): whether the power station can run the load at a given moment.
- Watt-hours (Wh): approximately how long the stored energy can support the load.
You must pass both tests. A 1,000 Wh battery with a 600 W inverter cannot run an appliance that needs 1,200 W. A 1,800 W inverter may start that appliance, but a small battery behind it might run the appliance only briefly.
The sizing formula
For each load:
load watt-hours = running watts × hours usedAdd every load, then estimate battery capacity:
minimum labeled battery Wh = total load Wh ÷ expected usable fractionUsing 0.8 as an initial planning allowance accounts for conversion loss and some reserve, but it is not a product guarantee. AC inverter loss, low temperature, battery age, standby consumption, power factor, and the power station’s own operating overhead can all change runtime. Manufacturer runtime data and a measured test with your equipment are better than a generic allowance.
Example:
router: 12 W × 8 h = 96 Wh
laptop: 45 W × 3 h = 135 Wh
LED lantern: 5 W × 6 h = 30 Wh
phones: 30 Wh
total load: 291 Wh
planning capacity: 291 ÷ 0.8 = about 364 WhThis example does not mean every household needs a 364 Wh unit. Measure your loads. A laptop that charges intermittently and a router drawing 7 W create a different result.
Measure before buying
Read the device nameplate and manual, but do not treat a maximum input rating as typical consumption. A plug-in energy monitor can measure many 120 V loads over hours or days while utility power is available. USB meters can help with smaller electronics. Do not insert a consumer energy monitor where the appliance or medical-device manufacturer prohibits one.
For every proposed load, record:
- normal running watts;
- startup or compressor surge, if applicable;
- required daily runtime;
- AC, USB-C, USB-A, or 12 V connection;
- whether it can tolerate a brief transfer interruption;
- whether the manufacturer permits the proposed power source.
Use the worked examples in How Big a Power Station Do I Need for a Power Outage? before selecting a capacity class.
Direct DC or USB power can avoid turning battery power into AC and back into DC through a device charger, but only use the correct voltage, connector, and supported charging standard.
Features that matter in a home
Prioritize these over a long list of outlets:
- Independent safety certification: look for the exact product’s listing or certification by a recognized testing organization, not a vague claim about one internal component.
- Useful output: enough continuous and surge wattage for measured loads.
- Useful capacity: enough watt-hours after a realistic loss allowance.
- Recharge time: fast enough to refill between rolling outages, without exceeding the circuit or manufacturer directions.
- Low idle draw: important when supporting tiny loads such as a router.
- Replaceable or expandable battery: useful only if you will actually buy and store the compatible module.
- Weight and handles: you may need to carry it down stairs or to a powered location.
- Noise: inverter and cooling fans can cycle in a bedroom.
- UPS or EPS behavior: only when documented, with a transfer time and supported loads appropriate to your equipment.
- Storage guidance and warranty: batteries should be stored and cycled as the manufacturer directs.
Do not bury a power station under bedding, charge it in an exit path, expose it to water, or use a damaged unit. Follow its clearances and temperature limits. Stop using a battery that is swollen, leaking, unusually hot, hissing, or producing an unusual odor, and follow local emergency guidance.
Can a power station keep the refrigerator cold?
Sometimes, but preservation begins by keeping the door closed. FDA says an unopened refrigerator stays cold for about four hours. A full freezer can maintain temperature for about 48 hours, while a half-full freezer is about 24 hours, provided the door remains closed.[5] Appliance thermometers give you evidence when power returns.
Before an outage, freezing suitable food can extend its useful storage time and help a full freezer hold temperature longer. Browse the CanIFreeze.com food storage and freezing categories to check what freezes well, how to package it, and how to thaw it safely. During and after an outage, continue to follow FDA temperature and discard guidance.
To evaluate battery backup for a refrigerator:
- Measure energy use over at least a typical day, not one minute.
- Find the compressor’s starting requirement from reliable documentation or a suitable measurement.
- Confirm the battery inverter supports that surge.
- Decide what else will share the battery.
- Test the complete setup before an emergency without leaving food safety to chance.
The complete measurement and runtime method is covered in Can a Portable Power Station Run a Refrigerator?.
A refrigerator cycles, so running watts × 24 can overstate consumption if running watts were measured only while the compressor was active. The opposite error is worse: measuring during a quiet cycle and assuming the refrigerator uses almost nothing.
For a long outage, a cooler, frozen gel packs, block ice, and a food-discard plan may be more dependable than spending the entire battery on refrigeration. FDA recommends preparing ice and coolers in advance and says not to rely on appearance or odor when deciding whether food is safe.[5]
Medical devices need their own outage plan
Do not size backup for life-sustaining or medically necessary equipment from a blog formula alone. Ask the medical-device manufacturer, supplier, clinician, utility, and local emergency services:
- what backup sources the exact device supports;
- how long its internal battery actually lasts;
- how to switch power sources;
- what alarms mean;
- whether settings change after power is restored;
- where to relocate before the battery is depleted;
- how refrigerated medication should be handled.
FDA advises users to read the instructions or contact the distributor or manufacturer about battery or generator operation. It also advises notifying the utility and fire department when a medical device requires power, and checking settings after restoration because some devices can reset.[6] Ready.gov recommends a support network and planning around power-dependent equipment for people with disabilities.[7]
Treat a consumer power station as one component only when the device maker or qualified provider confirms compatibility. A displayed runtime estimate is not a medical guarantee.
When a fuel generator is appropriate
Fuel generators can solve large-load and long-runtime problems when they can be operated, connected, secured, and fueled safely. They may be a defensible choice for a detached house with adequate outdoor clearance, a suitable weather plan, and a safe method of powering selected loads. Their exhaust makes location nonnegotiable. CPSC says never to use a portable generator inside a home or garage, even with doors and windows open, and says to operate it outside at least 20 feet from the home with exhaust facing away.[3] CDC also warns against gasoline-powered engines indoors and recommends a battery-powered or battery-backup carbon-monoxide detector when a generator is used.[4]
That rules out common improvisations:
- inside any home or apartment;
- in a hallway, basement, or attached garage;
- on most balconies;
- outside a window or building air intake;
- in a shed or enclosed courtyard;
- in a location where exhaust can reach a neighbor’s opening.
Apartment residents should also read Can You Use a Generator on an Apartment Balcony?, which applies the clearance guidance to neighboring windows, doors, vents, shared spaces, and lease restrictions.
Do not backfeed a home through a receptacle or improvised cord. Supplying building wiring requires equipment and work appropriate to the electrical system, plus any required owner approval, professional installation, permits, and utility coordination. A portable plug-in setup should power selected devices directly unless the property has a properly installed transfer system. If battery backup fits your site, compare current options in Best Portable Power Stations for Power Outages.
Fuel storage, noise, shared-space rules, theft risk, weather exposure, and refueling during a storm can make a technically outdoor location impractical. When the required clearance and safe connection method are unavailable, a generator is not the right solution. A professionally installed standby system can offer automatic operation and support larger circuits, but it is a property project rather than a portable purchase.
Heat and cold: know when batteries are not enough
Space heating and compressor cooling are punishing battery loads. At 1,500 W, a heater consumes 1,500 Wh per hour before losses. A nominal 1,000 Wh station cannot deliver a full hour at that load, even if its inverter can power the heater.
Use low-power steps first:
During heat
- close blinds before direct sun enters;
- move to the coolest safe room;
- use a small fan when indoor conditions and health guidance make it appropriate;
- drink water and monitor official heat alerts;
- identify a powered cooling center, hotel, friend, or family location before conditions become unsafe.
During cold
- close curtains after dark while keeping heaters clear of fabric;
- layer clothing and bedding;
- close off unused rooms if safe;
- know where you can relocate for dependable heat;
- never use a grill, camp stove, oven, or fuel-burning appliance as improvised indoor heat.
CDC advises following heat-safety guidance during an outage and warns that alternative fuel sources used for heating, cooling, or cooking can allow carbon monoxide to accumulate indoors.[4] A battery can buy communication time and power a small fan. It should not create false confidence that a home will remain habitable through any temperature extreme.
Property-specific checks before you buy
Renters and multi-unit buildings
Renters should search their lease and building rules for generators, fuel, batteries, charging, balconies, common areas, alterations, extension cords, and emergency procedures. Ask the landlord or property manager in writing when a rule is unclear. Permission for a normal appliance does not automatically cover fuel storage, exterior equipment, drilling, or wiring changes. Most apartment balconies also cannot provide the generator clearance CPSC specifies from every home, window, door, and vent.
Homeowners should still check local requirements, homeowners association rules, fuel-storage restrictions, insurance conditions, and the generator manufacturer’s instructions. Ownership does not make an unsafe location or improvised electrical connection acceptable.
Confirm the circuit and charging location
A large power station can draw substantial power while recharging. Follow the manufacturer instructions, use a suitable wall receptacle, and avoid stacking adapters or overloading a circuit already serving major appliances. Keep the unit out of exits and away from water and heat.
Plan for electronic access
Test mechanical keys and manual releases, then learn what happens to entrances, elevators, intercoms, garage doors, gates, wells, and security systems during an outage. Keep mobility needs central. A heavy power station upstairs is not portable if the elevator stops and the user cannot safely carry it.
Check insurance before a loss
Coverage for spoiled food, temporary lodging, electronics, generator damage, or power-surge losses varies by policy and cause of loss. Ask the insurer what documentation is required and what deductible applies. Photograph appliance thermometers, keep outage notices and receipts, and do not assume a claim will be covered.
A 30-minute setup test
Do not wait for a storm to discover that the cable is missing.
- Charge every battery using the manufacturer’s directions.
- Turn off and unplug nonessential test loads.
- Connect only the equipment in your written plan.
- Confirm watts, ports, cables, and any transfer behavior.
- Run the setup long enough to catch fan noise, overheating, or unexpected idle draw.
- Practice finding lights and the exit in the dark.
- Confirm that everyone knows the relocation threshold.
- Recharge the kit and return each item to its assigned place.
For a refrigerator or medical need, use a longer, controlled, device-appropriate test and preserve a safe fallback. Never create a medical or food-safety risk just to test runtime.
Common blackout mistakes
Buying one giant battery before measuring anything
Capacity is expensive and heavy. A smaller, well-sized system plus a separate phone bank often provides better redundancy than one oversized box used for every load.
Planning around wattage but ignoring watt-hours
High inverter output tells you what can start. It does not tell you how long it will run.
Running tiny loads from AC all night
The inverter itself consumes power. Use a compatible USB or DC connection when the equipment permits it, and switch unused outputs off.
Treating a balcony as outdoors enough for a generator
The relevant questions are clearance, exhaust path, openings, neighbors, manufacturer directions, and rules. The word outdoors by itself does not answer them.
Opening the refrigerator repeatedly
Every check releases cold air. Put a thermometer inside before the outage and keep the door shut.
Depending on solar charging without testing the site
Shade, weather, panel angle, glass, roof access, balcony exposure, and property rules can all reduce useful solar input. Treat solar as replenishment only after measuring it in the exact allowed location.
Forgetting maintenance
Batteries self-discharge, software can change, cables migrate, and stored food expires. Put a recurring check on the calendar and follow each manufacturer’s storage-charge guidance.
Build the kit in three budgets
Minimal kit
- two LED lights;
- one power bank per phone-dependent adult or a shared bank sized for the plan;
- correct cables;
- spare batteries;
- appliance thermometers;
- basic Ready.gov supplies.
This is the right starting point for nearly everyone.
Work and connectivity kit
Add a UPS for the modem, router, and equipment that needs an orderly shutdown. Test whether the provider network remains available during local outages. Use a laptop’s internal battery before spending backup capacity on continuous charging.
Extended-outage kit
Add a portable power station sized from measured essential loads, plus a documented recharging plan. Split critical communication power across at least two batteries so one failure does not consume the entire reserve. Add cooling, refrigeration, or medical loads only after their specific compatibility and runtime are verified.
Final recommendation
For most households, the strongest starting setup is LED lighting plus phone power banks first, a UPS for equipment that cannot tolerate an abrupt shutdown, and a measured portable power station for longer essential loads. This package is portable, requires no permanent electrical work, and avoids combustion exhaust indoors. Detached homes with adequate outdoor clearance and larger load requirements can add a safely operated portable generator or professionally installed standby system.
Do not buy capacity by guessing. Write down watts and hours, verify startup demand, allow for losses, and test the exact setup. Keep the refrigerator closed during a short outage. Make a separate professional plan for medical equipment. Treat extreme heat or cold as a relocation decision before it becomes a battery-runtime contest.
Unless a fuel generator can meet official outdoor clearance, manufacturer instructions, property rules, safe electrical-connection requirements, and local requirements, it is not a blackout solution.
FAQ (Frequently Asked Questions)
What is the best backup power option for a home?
For most households, a portable battery power station is the practical middle ground for selected essentials. It can run electronics indoors without combustion exhaust and requires no permanent installation. A correctly installed standby system or safely located portable generator can support larger loads. Choose from measured wattage, runtime, site constraints, and required transfer behavior rather than from the largest appliance you own.
Can I use a portable generator on an apartment balcony?
Do not assume a balcony makes a fuel generator safe. CPSC says portable generators belong outdoors at least 20 feet from a home, with exhaust directed away from the building. Most apartment balconies cannot provide that clearance from your unit, neighboring windows, doors, or vents. A lease, building rule, fire code, or local rule may also prohibit fuel storage or generator use.
How big a power station do I need for a blackout?
List each essential device, its running watts, how many hours it must operate, and any startup surge. Add the watt-hours, then allow for conversion losses and reserve. As a planning estimate, divide required load watt-hours by about 0.8 to estimate labeled battery capacity. Verify the power station output rating, surge rating, ports, and the exact appliance specifications before buying.
Will a power station run a refrigerator?
Possibly, but both energy capacity and inverter output matter. Refrigerators cycle rather than draw their rated power continuously, and the compressor can demand more power at startup. Measure the refrigerator over time with a suitable energy monitor when utility power is available, then confirm that the power station can handle its starting surge. Keeping the doors closed is the first response to a short outage.
How long is food safe in the refrigerator during a blackout?
FDA says an unopened refrigerator keeps food cold for about four hours. A full freezer holds temperature for about 48 hours, or about 24 hours when half full, if the door remains closed. Use appliance thermometers and FDA discard guidance rather than smell or appearance to judge perishable food. When preparing before an outage, you can check CanIFreeze.com's food-specific freezing and storage guides.
Is a UPS the same as a portable power station?
No. A UPS is designed to switch quickly when grid power fails so connected electronics do not abruptly shut down. Its battery is often intended for minutes, not an all-day outage. A portable power station usually offers more energy and flexible ports, but only models with a documented UPS or EPS function should be expected to provide automatic transfer, and transfer performance must suit the connected device.
Can a battery power station run a space heater or air conditioner?
A large unit may technically start some heaters or room air conditioners, but these loads consume energy quickly. A 1,500-watt heater can exhaust roughly 1 kilowatt-hour of usable battery energy in well under an hour. For temperature extremes, use the battery for communications and smaller comfort loads while following local emergency guidance and relocating to a safe heated or cooled place when necessary.
What should I buy first for power outages?
Start with one reliable LED lantern per occupied area, a phone power bank and charging cables, spare batteries where needed, refrigerator and freezer thermometers, water, shelf-stable food, and a manual can opener. Add a UPS for equipment that needs an orderly shutdown and a portable power station only after calculating the loads you need to support.
Sources
- Ready.gov: Power Outagesready.gov(opens in a new tab)
- Ready.gov: Build a Kitready.gov(opens in a new tab)
- US Consumer Product Safety Commission: Carbon Monoxide Safetycpsc.gov(opens in a new tab)
- CDC: What to Do to Protect Yourself During a Power Outagecdc.gov(opens in a new tab)
- FDA: Food and Water Safety During Power Outages and Floodsfda.gov(opens in a new tab)
- FDA: Tips About Medical Devices and Natural Disastersfda.gov(opens in a new tab)
- Ready.gov: Individuals with Disabilitiesready.gov(opens in a new tab)