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Portable power station vs. generator for home backup: which should you buy?

By Nazrul Islam. Updated October 11, 2026.

The short version

How long will a power station run a fridge?

A portable power station is a large lithium battery with an inverter that turns its stored energy into normal 120-volt outlet power. Two numbers matter:

• Capacity (Wh): how much energy it holds. This sets how long things run.
• Output (W): how much power it can give at once. This sets what can run together.

The limit is that the energy is fixed. A 2,000 Wh unit holds 2,000 Wh, and about 85% of that reaches your devices after the inverter’s losses. A full-size fridge uses roughly 1 to 2 kWh a day, so a 2,000 Wh station keeps a fridge alone running for roughly one to one and a half days, less if anything else is plugged in.

Recharging extends it: from a wall outlet when power returns, from a car’s 12 V socket (slowly), or from solar panels.

How much solar adds: a rough estimate is panel watts × hours of full sun × 0.75 for real-world losses. A 200 W panel with 4 hours of full sun gives about 200 × 4 × 0.75 = 600 Wh in a day. Winter days, clouds and shade give less.

Which is better for long power outages?

A generator burns fuel to spin an alternator. It produces power for as long as it has fuel, which is why it wins for long outages. Most portable generators run gasoline; dual-fuel models also run on propane, which stores for years without going stale. Store propane tanks outdoors, never in a garage or basement, and expect somewhat less power output when running on propane.

The limits are noise, upkeep and, above all, carbon monoxide. The U.S. Consumer Product Safety Commission says an average of nearly 100 people in the U.S. die each year from carbon monoxide poisoning from portable generators (2017 to 2019 average). Generator exhaust can kill in minutes.

CPSC safety rules:

• Never run a generator inside a home, garage, basement, crawlspace or shed, even with doors and windows open.
• Run it outside only, at least 20 feet from the house, with the exhaust pointed away from doors, windows and vents.
• Look for models with an automatic CO shut-off feature.
• Install battery-powered or battery-backup CO alarms inside the home.
• Let the generator cool down before refueling, and do not run it in rain or snow without a cover made for that purpose.

Inverter generators produce cleaner power that is safe for laptops and other electronics, and they are quieter and more fuel-efficient at light loads. Conventional (open-frame) generators give more watts for the money but are louder.

Which one for your situation?

Outages of a few hours, a few times a year: a power station. It sits ready, needs no fuel and you can run it in the kitchen.

Apartment or condo: a power station. You likely have nowhere safe to run a generator 20 feet from the building.

Medical devices such as a CPAP: a power station is the safer indoor choice. Turning off a CPAP’s heated humidifier, or using the maker’s DC adapter, makes the battery last much longer. Check the device maker’s guidance, and for oxygen concentrators or ventilators, talk to your doctor and ask your utility about its medical priority program.

Outages that last days (hurricane, ice storm regions): a generator, or a power station paired with enough solar panels to refill it each day.

Well pump, sump pump or window AC: usually a generator. These motors need a large burst of power to start, and running them for many hours drains a battery quickly. Large power stations (3,000 W+ output) can run some of them, but runtime will be short.

Gas furnace: the blower in a gas furnace typically draws a few hundred watts, so a mid-size power station can run it for hours. The catch is that furnaces are usually hardwired, so you need an electrician-installed inlet or transfer switch to power one from either a station or a generator.

Space heater: a poor match for a power station. A 1,500 W heater drains a 2,000 Wh station in about an hour.

Both: many households use a power station indoors overnight for quiet essentials and run a generator outdoors during the day to cover heavy loads and recharge the station.

Is a generator or power station cheaper to run?

Power station: recharging from the grid costs very little. A full 2,000 Wh charge is about 2.3 kWh from the wall, around 40 cents at 18 cents per kWh. The bigger cost is the battery wearing out over time. Many current models use lithium iron phosphate (LiFePO4) cells and list ratings of several thousand charge cycles, which is many years of occasional outage use.

Generator: the cost is fuel and maintenance. Fuel use depends on the size of the generator and how hard it is working; check the run time at 25% and 50% load on the spec sheet. Gasoline goes stale in storage, so use fuel stabilizer and rotate fuel, or choose a dual-fuel model and store propane.

How to connect a generator or power station to your house safely

The simple way is extension cords from the unit to the devices you need. Use outdoor-rated cords heavy enough for the load; a cord that feels warm is too thin.

To power circuits in your home’s wiring, such as a well pump or furnace that is hardwired, you need a transfer switch or interlock kit installed by a licensed electrician. Never plug a generator or power station into a wall outlet to “backfeed” the house. It violates electrical codes, can start a fire, and can send power back down the line to kill utility workers. Some power station makers sell home backup kits that work with a professionally installed transfer switch.

How to size either one

1. List what you need to run during an outage.
2. Add up running watts for everything that will run at the same time. That is the continuous output you need.
3. Find the device with the largest start-up surge, usually the fridge or a pump, and add that surge to the total. That is the surge output you need.
4. For a power station, also add up watt-hours per day to size the battery.

Our power station size calculator does steps 2 to 4 for you, using typical watts you can adjust.

Quick answers

Can I run a power station indoors? Yes. It produces no exhaust. Keep it ventilated, away from water and flammable materials while charging, and follow the maker’s instructions. Choose one certified to the UL 2743 safety standard, stop using any unit that is damaged or swollen, and check for recalls at cpsc.gov.

Can a power station run a whole house? Not a portable one. Whole-home backup needs an installed home battery system or a standby generator connected to natural gas or propane, sized and installed by a professional. Both cost far more than portable options but switch on automatically.

Is a power station worth it instead of a generator? For short outages and essentials, often yes: no fuel, no fumes, no noise, and no maintenance beyond charging. For long outages or heavy loads, a generator is still the more practical and cheaper source of large amounts of energy.

Can I charge a power station from a generator? Yes. Many people do this during long outages: run the generator outside for a few hours, charge the station, then use the station quietly indoors overnight.