Backup power is where preparedness budgets go to die. The marketing runs apocalyptic, the price range spans two orders of magnitude, and the honest first question — how long are outages where you live, actually? — rarely gets asked. A household that loses power for two hours a few times a year needs a completely different answer than one that loses it for a week every storm season.

This guide works through the decision in tiers, from a power bank to a standby generator, with the safety rules that apply to all of them.

Start with your real outage profile

Before pricing anything, characterize the problem:

  • Typical duration. Think back over the last few years. Hours? A day? Multiple days? Utilities’ restoration patterns are fairly consistent for a given area and hazard mix.
  • Tail risk. What does the bad year look like for your region — an ice storm, a hurricane or typhoon, a wildfire-driven shutoff? Households in tropical cyclone territory (see our typhoon guide) should plan for the long tail, because storm-damaged grids, especially on islands, can take extended periods to fully restore.
  • Critical loads. List what genuinely must stay powered: medical equipment first (this changes everything — talk to your equipment provider and utility about registered support programs), then refrigeration, communications, heat or cooling depending on climate, and well pumps or sump pumps where applicable.

Most households discover their real requirement is much smaller than the marketing suggested: bridge the refrigerator, keep phones and a router alive, run some light. That’s achievable well below whole-home cost.

Tier one: no-engine basics (every household)

Regardless of anything else, every household should hold the baseline from our 72-hour kit guide: LED lanterns and headlamps, spare batteries, and phone power banks kept charged. Add two habits:

  • Keep the refrigerator closed. Standard food-safety guidance from FoodSafety.gov is that an unopened refrigerator keeps food safe for about 4 hours, a full freezer about 48 hours (24 if half-full). A door left shut outperforms a small generator opened hourly.
  • Know your medical and connectivity dependencies. Cordless phones and fiber/cable internet die with the power; a charged power bank and a mobile hotspot plan cover most communication needs for a day.

Tier two: portable power stations (outages up to ~a day)

Battery power stations — lithium units from a few hundred watt-hours to several kilowatt-hours — have become the sensible middle tier. They run silent, produce no exhaust, can live indoors, charge from wall, vehicle, or solar panels, and need near-zero maintenance.

Sizing logic: a refrigerator’s realistic draw over a day is usually in the 1–2 kWh range depending on the unit and climate; phones, router, and LED light add little. A station in the 1–2 kWh class, possibly paired with a folding solar panel for multi-day stretching, covers the “keep food, phones, and light alive” mission for most households — without any of the hazards of combustion.

Their limits are equally clear: resistive heat loads (space heaters, electric ranges) and central HVAC will flatten them quickly. They bridge outages; they don’t power a lifestyle.

Tier three: portable generators (multi-day outages)

When your profile includes multi-day outages, combustion enters the picture. A mid-size portable inverter generator can carry a refrigerator, freezer, lights, electronics, and a window AC or furnace fan with fuel discipline.

The decision points:

  • Fuel. Gasoline stales and stations need power to pump — storm-season fuel planning is part of the system. Dual-fuel (propane) models trade some output for propane’s indefinite shelf life.
  • Connection. Extension cords to individual appliances are the safe default. Powering circuits through the panel requires a transfer switch or interlock installed by an electrician — never a “backfeed” cord into a wall outlet, which can energize utility lines and endanger line workers. This rule has no exceptions.
  • Noise and neighbors. Inverter models are dramatically quieter — a community consideration that matters more the longer the outage runs.

The safety rule that outranks everything

Generators kill primarily through carbon monoxide. The CDC’s guidance is unambiguous: operate generators outdoors only, far from windows, doors, and vents — never in a garage, carport, basement, or enclosed porch, even with doors open. Carbon monoxide deaths cluster after every major storm, and they are entirely preventable: outdoor placement, pointed away from openings, plus battery-backed CO alarms inside the home. If a generator is in your plan, CO alarms are in your plan.

Add the operational basics: shut down and cool before refueling, keep fuel stored properly away from living space, and dry hands and dry ground for any electrical connection.

Tier four: standby systems (frequent, long, or medical-critical outages)

Permanently installed standby generators (typically propane or natural gas, with automatic transfer) and whole-home battery systems make sense at the top of the outage distribution: regions with regular multi-day events, households with medical dependencies, or homes where freeze damage is a real winter risk. They are professional-install territory with real ongoing maintenance, and a topic we’ll treat separately; the sizing and safety logic above still governs.

During the outage: information and reporting

Backup power is half the outage plan; the other half is knowing what’s happening. Three habits:

  • Bookmark your utility’s outage map and reporting channel now. Utilities prioritize restoration partly on reported outage clusters; an unreported outage on your street is invisible. Most utilities take reports by app, text shortcode, or phone — store all three while the grid is up, because discovering the reporting number requires the internet you no longer have.
  • Register medical needs in advance. Households dependent on powered medical equipment should ask the utility about its medical-needs registry. Registration typically brings advance notice of planned shutoffs and a restoration flag — it does not guarantee continuity, which is why the equipment-backup tiers above still apply.
  • Treat restoration estimates as estimates. Early in a major event, utilities often can’t assess damage until weather clears; estimates firm up as crews survey. The planning implication: act on your supplies and food-safety clocks, not on the first restoration time you see.

And one neighborly note that recurs in every long outage: the households that fare best share refrigeration triage, charging, and generator time. A generator running four scheduled hours a day can hold several households’ refrigerators — fuel-efficient, quieter, and better for everyone than four machines running around the clock.

The quiet complement: reduce what needs power

Resilience isn’t only generation. Weatherization keeps a house livable longer without HVAC (and pairs with the wind-hardening work in our home hardening guide); insulated water heaters hold heat for a day; a manual can opener, a French press, and a propane camp stove (used outdoors) remove three common “we need power to eat” assumptions. The cheapest kilowatt is the one you didn’t need.

The same thinking applies to light and heat. A house with good window coverings holds winter heat for many hours longer than a drafty one, which can be the difference between an uncomfortable night and a pipe-freezing emergency. In summer, the reverse discipline — shades down on sun-facing windows, activity moved to the coolest room, cooking moved outdoors — keeps a powerless house livable far longer than most people expect. None of this appears on a backup-power shopping list, but it directly shrinks the load any battery or generator has to carry, and it works on day four of an outage exactly as well as on day one, with no fuel logistics at all.

FAQ

How long does food last in the refrigerator during a power outage?

Per FoodSafety.gov guidance: about 4 hours in an unopened refrigerator, about 48 hours in a full unopened freezer (24 hours if half-full). Keeping doors closed is the single most effective action, and a refrigerator thermometer removes the guesswork afterward.

Can a portable power station run a refrigerator?

Generally yes, for a limited time. Refrigerators typically consume on the order of 1–2 kWh per day, so a power station in that capacity class can bridge roughly a day, longer with solar recharging. Check that the station’s continuous and surge output ratings exceed your refrigerator’s startup demand.

Where is it safe to run a portable generator?

Outdoors only — well away from windows, doors, and vents, with exhaust pointed away from the house. Never in a garage, basement, carport, or enclosed porch, even ventilated. Pair any generator with battery-backed carbon monoxide alarms indoors.

Backfeeding a house through a wall outlet is dangerous and widely prohibited — it can energize external utility lines and endanger line workers. Whole-circuit connection requires a transfer switch or interlock installed by a licensed electrician; otherwise, use outdoor-rated extension cords to individual appliances.

Do I need a generator at all?

Many households don’t. If your outages run a few hours a few times a year, LED lighting, power banks, a closed refrigerator, and a modest power station cover the actual risk — silently, safely, and at a fraction of the cost and maintenance. Start from your real outage history rather than the worst storm on the news; the right answer for your street is written in the last three years of your own utility’s restoration times, not in a generator advertisement.