A power station can keep the essentials running when the grid goes down, but it is not a magic replacement for every circuit in your house. The real answer to what can a power station run comes down to three numbers: the appliance's running watts, its startup surge, and the battery capacity available in the unit.
For a phone, laptop, router, light, or CPAP machine, even a compact portable power station can be a practical backup. For a refrigerator, microwave, sump pump, space heater, or central air conditioner, you need to look much more closely at output ratings and capacity. Buying based on battery size alone is one of the most common mistakes shoppers make.
What Can a Power Station Run During an Outage?
Portable power stations are best suited to electronics, small appliances, medical devices, communication equipment, and selected kitchen or comfort essentials. They provide quiet, fume-free power indoors, which makes them particularly useful overnight or in apartments, RVs, tents, and enclosed work areas where a fuel-powered generator cannot operate safely.
A typical power station may run devices such as:
- Smartphones, tablets, cameras, and rechargeable tool batteries
- Laptops, monitors, Wi-Fi routers, modems, and small televisions
- LED lamps, fans, CPAP machines, and many medical devices
- Portable refrigerators, mini fridges, blenders, coffee makers, and some microwaves
- Electric blankets, projectors, drones, and mobile work equipment
The Difference Between Watts and Watt-Hours
Watts measure how much power an item needs at a given moment. Watt-hours measure how much energy the battery stores over time. You need both numbers to plan reliable backup power.
Think of watts as the width of a hose and watt-hours as the amount of water in the tank. A power station with a large battery but low AC output may run electronics for a long time but still be unable to start a high-wattage appliance. A high-output model with a smaller battery may start the appliance but run it only briefly.
For example, a 1,000Wh power station can theoretically supply a 100-watt load for 10 hours. In actual use, expect less because power conversion creates losses and many appliances cycle on and off. A realistic estimate is often closer to 80% to 90% of rated capacity when using AC outlets.
Match Your Appliance Load to the Power Station
Start by finding the appliance wattage. It may be printed on a label, in the owner’s manual, or listed as amps and volts. For a standard US 120V appliance, multiply amps by 120 to estimate watts. A device rated at 2 amps, for instance, uses roughly 240 watts.
Next, compare that number to the power station’s continuous output. Leave some room rather than operating at the limit. If your refrigerator normally uses 150 watts, a station rated for 300 watts could appear sufficient. But refrigerators have compressors that draw a brief surge when starting, sometimes several times their running wattage. A larger inverter with a suitable surge rating gives you a better chance of reliable operation.
Here are common planning ranges. Actual draw varies by age, model, settings, room temperature, and use pattern.
| Device | Typical Running Watts | What to Watch For |
| --- | ---: | --- |
| Smartphone charger | 5-20W | Small load, usually many recharges |
| Laptop | 40-100W | Higher draw when gaming or editing video |
| Wi-Fi router and modem | 15-40W | Excellent outage-use load |
| LED light | 5-15W | Very efficient for long runtimes |
| CPAP machine | 30-90W | Heated humidifier can raise demand substantially |
| TV | 50-200W | Screen size and brightness affect use |
| Portable fan | 20-100W | Lower settings extend runtime |
| Refrigerator | 100-300W running | Compressor startup surge is critical |
| Microwave | 800-1,500W | Short use, but high battery drain |
| Coffee maker | 800-1,500W | Heating element demands high output |
| Space heater | 1,500W | Drains most power stations quickly |
A space heater is a good example of why runtime matters as much as output. A 2,000-watt power station may be able to run a 1,500-watt heater, but a 1,000Wh battery may last well under an hour after conversion losses. For outage preparedness, a blanket, layered clothing, or a low-watt heating option is usually a more sensible use of stored power.
Estimate Runtime Before You Buy
A quick runtime calculation prevents disappointment. Use this formula:
Estimated runtime = usable battery watt-hours ÷ appliance watts
If you have a 1,500Wh station and assume 85% usable energy through AC output, you have about 1,275Wh available. A 75-watt TV could run for roughly 17 hours. A 150-watt refrigerator would theoretically get about 8.5 hours of continuous operation, though refrigerators cycle, so actual performance may be longer or shorter depending on compressor behavior and how often the door is opened.
For a more useful home outage plan, calculate your essential loads together. A 60-watt TV, 25-watt router, 10 watts of LED lights, and a 40-watt fan total 135 watts. On a 1,000Wh station with approximately 850Wh of usable AC energy, that group could run for around six hours. Turn off the TV and the same station can keep communications, lighting, and airflow going much longer.
This is why load management matters. Use the power station for what protects comfort, safety, and communication first. Charge phones, keep the router online if your internet service is still active, run lights, power medical equipment as appropriate, and cycle a refrigerator when needed. Avoid treating a battery power station like unlimited household electricity.
Appliances That Usually Need a Bigger Solution
Some household equipment is not a good match for a typical portable power station. Central air conditioners, electric water heaters, electric ranges, clothes dryers, large well pumps, and whole-home HVAC systems generally require far more power than standard portable battery units can provide.
That does not mean battery backup is the wrong choice. It means you may need a larger expandable system, a dedicated home battery setup, or a fuel-based generator for high-demand or long-duration outages. In Florida, where storm season can bring multi-day disruptions and high heat, a combination approach can make sense: battery power for quiet indoor essentials and a properly sized generator for refrigeration, pumps, and larger household loads.
Never connect a portable power station directly to home wiring unless it is part of a properly designed system with the required transfer equipment. Backfeeding power through an outlet is dangerous and can injure utility workers, damage equipment, and create a fire risk. If you want selected circuits powered during an outage, speak with a qualified electrician about a safe installation.
Solar Charging Changes the Plan, Not the Load Limit
Solar panels can extend a power station’s useful runtime, especially for camping, RV travel, remote work, or extended emergencies. They do not increase the station’s AC output. A 1,000-watt inverter remains a 1,000-watt inverter even while solar panels are charging the battery.
Solar performance also depends on panel wattage, sunlight, panel angle, temperature, cloud cover, and the station’s maximum solar input. A 200-watt panel rarely produces a constant 200 watts all day. Plan for variable production and use solar as a way to recharge between loads, not as a guarantee that every appliance can run continuously.
For overnight needs, battery capacity still carries the load. This is particularly relevant for CPAP users, medical-device users, and anyone relying on refrigeration for medication. Build in a safety margin rather than planning around perfect weather.
Choose the Right Size for Your Use Case
Small power stations are ideal for charging devices, running lights, keeping a router online, and covering short trips. Mid-size models are often the sweet spot for camping, mobile work, CPAP use, and refrigerator backup. Larger units with higher inverter output and expansion batteries are better for serious outage readiness, power tools, and multiple essential loads.
Before choosing a model, write down the devices you truly need, their watts, how many hours you expect to use them, and whether any have a motor or heating element. That short list will tell you more than a product’s headline capacity ever can.
The best power station is not necessarily the biggest one. It is the one that can safely start your critical equipment, store enough energy for your expected outage or trip, and recharge in a way that fits how you live. GenVault shoppers comparing portable power stations, solar-ready options, and generator backup can use those three criteria to narrow the field without guessing.