Most people buy a portable power station and only realize the problem when they plug something in and nothing happens.
They checked the capacity (watt-hours). They didn’t check the output (watts). Those are two different numbers, and confusing them is the most common mistake people make.
This guide breaks it all down. You’ll know exactly what a portable power station can run, what size you need for your use case, and which appliances to leave plugged into the wall.
What Can a Portable Power Station Run?
A portable power station can run any device that draws less power than its continuous watt output, including phones, laptops, lights, fans, televisions, routers, CPAP machines, and mini-fridges. Larger stations (2,000Wh+) can also handle small window air conditioners, power tools, and full-size refrigerators for several hours at a stretch.
That’s the short version.
The longer version:
It depends on two numbers.
First, the device’s wattage (how much power it needs to run).
Second, the station’s continuous AC output (the maximum it can deliver at any moment).
If your device needs more watts than the station can output, it won’t run at all, regardless of how much capacity the battery holds.
EcoFlow breaks this down well with a full list of device categories and their typical watt ranges.
What’s the Difference Between Watts and Watt-Hours?
Watts (W) measure how much power a device needs at any given moment. Watt-hours (Wh) measure how much total energy a power station can store. Watts tell you if it can run the device at all. Watt-hours tell you how long.
Think of it like a water tank.
Watt-hours is the tank size.
Watts is how fast water flows out.
A 1,000Wh station running a 100W device will last about 10 hours (minus a small efficiency loss). The same station running a 500W device lasts roughly 2 hours.
There’s one more concept that trips people up: starting watts versus running watts.
Running watts is the steady power a device needs once it’s operating.
Starting watts (also called surge watts) is the spike of power some devices need to turn on. Motors and compressors, like the kind inside a refrigerator or air conditioner, can draw 2 to 5 times their running wattage for a second or two when they start up.
A fridge that draws 150W while running might pull 600W or more on startup. If your station’s surge rating can’t cover that spike, the inverter shuts off and the device never actually starts.
That’s why surge wattage matters as much as continuous wattage when running anything with a compressor or motor.
What a 300–500Wh Station Can Run
This is the camping and emergency-kit tier. It’s not going to power your house, but it covers the devices most people actually need in a pinch.
What it handles well:
- Smartphones (10–20W): 15–25 full charges from a 300Wh unit
- Laptops (45–90W): 3–6 hours of use
- LED lights (5–20W): 15–60+ hours depending on setup
- Small fans (15–50W): 6–20 hours
- CPAP machine without humidifier (~30–50W): comfortably through the night — a CPAP at 40W draws around 320Wh over 8 hours, well within a 500Wh unit
- Camera batteries, tablets, e-readers: light draws, easy to manage
What it can’t handle:
Anything with a compressor (mini-fridges, portable coolers with a compressor) or a heating element (coffee makers, electric kettles, toasters) pushes past what a small station can deliver.
These appliances spike into the 700W–1,500W range immediately, which is beyond the continuous output of most 300–500Wh stations.
For camping, a 500Wh unit covers a weekend of phone charging, laptop use, lighting, and a CPAP without any stress.
What a 1,000Wh Station Can Run
This is the sweet spot for most people. A 1,000Wh station covers everything a smaller unit handles, and adds meaningful appliance support.
At this capacity, you can run a mini-fridge (60–100W) comfortably for 8–12 hours.
A full-size refrigerator (100–400W average draw) can stay cold for 8–12 hours on a single charge, which is enough to get through a power outage overnight.
A CPAP with a heated humidifier (60–120W) runs through the night without issue.
Other devices in range:
- Televisions (50–200W): 5–20 hours depending on screen size
- Wi-Fi router (10–20W): 40–80 hours
- Small power tools (200–500W for drills, jigsaws): 2–5 hours of actual run time
- Portable projector (50–150W): solid movie night setup
- Blender or coffee maker (600–1,000W): possible, but these are high-draw for short bursts — check your station’s continuous watt rating before assuming
The key limitation at this tier: surge wattage.
A 1,000Wh station that outputs 1,000W continuously might only surge to 2,000W. A standard fridge compressor can briefly pull 1,500–2,200W on startup.
If the station’s surge rating is too low, the fridge won’t start. Always check surge specs before pairing with a refrigerator.
What a 2,000Wh+ Station Can Run
At 2,000Wh and up, you’re in home backup territory.
These stations are designed to keep essential circuits running during outages, or to power a worksite where there’s no outlet nearby.
The real advantage here isn’t just capacity, it’s output. Most 2,000Wh+ stations deliver 2,000W or more continuously, with surge ratings of 4,000W+. That opens the door to appliances smaller stations can’t touch.
What 2,000Wh+ can handle:
- Full-size refrigerator: 15–20 hours, or longer paired with solar panels
- Small window air conditioner (600–1,000W running, 1,200–2,000W surge): possible, but runtime is 2–3 hours — enough to cool a room before bed
- Electric space heater (750–1,500W): 1–2.5 hours — resistive load so no surge spike, but the draw drains capacity fast
- Power tools (circular saws, grinders at 1,000–1,800W): several hours of actual work time
- Multiple devices simultaneously: fridge + router + lights + phone charging is a realistic home backup combo
For context, this is EcoFlow DELTA 2 Max and BLUETTI AC200L territory. Units at this level are serious equipment, not camping accessories. Check our best portable power stations guide for picks across every budget and capacity tier.
What a Portable Power Station Cannot Run
Most portable power stations can’t run electric dryers, electric water heaters, central air conditioners, or electric ranges.
These are 240V, high-draw appliances that require 3,000–12,000 watts of continuous power, which is far beyond what any current portable station delivers.
The full no-go list:
- Electric dryer: 5,000–7,500W — not compatible with any portable power station
- Electric water heater: 4,000–5,500W — same issue
- Central air conditioner or heat pump: 240V, 3,000–7,000W+ — portable stations run on 120V and simply can’t interface with these systems
- Electric range: 3,000–12,000W depending on burners in use
- Whole-home HVAC system: requires hardwired 240V circuits
If you need to power these during an outage, a portable power station isn’t the answer. A quiet portable generator with the right wattage rating is a better fit for heavy-duty backup needs.
One more honest note: even devices that technically fall within a station’s watt rating can drain the battery faster than you’d expect.
A space heater at 1,500W will empty a 2,000Wh station in just over an hour. Resistive heating loads are legal but brutal on runtime.
How to Calculate What Your Power Station Can Handle
You don’t need to guess.
Here’s the formula:
Step 1: Find the wattage of each device you want to run. It’s usually on a label on the back or bottom, in the manual, or in the product specs online.
Step 2: Multiply each device’s wattage by the number of hours you’ll run it. That gives you watt-hours per device.
Step 3: Add all your device Wh totals together.
Step 4: Add a 20% buffer. Inverters aren’t 100% efficient, so you lose roughly 10–20% of capacity to heat and conversion. Divide your total by 0.8 to get the minimum Wh capacity you need.
Example: You want to run a laptop (65W) for 6 hours, a router (15W) for 8 hours, and charge your phone twice (20W for 2 hours).
- Laptop: 65 × 6 = 390Wh
- Router: 15 × 8 = 120Wh
- Phone: 20 × 2 = 40Wh
- Total: 550Wh
- With 20% buffer: 550 ÷ 0.8 = 688Wh minimum
A 700Wh or 1,000Wh station covers that setup comfortably.
For anything with a motor: also check the station’s surge watt rating against the device’s starting watt requirement. If the starting watts exceed the surge rating, the device won’t start, no matter how much battery capacity you have.
Final Thoughts
A portable power station is genuinely useful for a wide range of situations, from camping and road trips to home outages and worksites. The key is matching the right station to your actual needs.
Here’s the short version of what you learned:
- Any size: phones, laptops, lights, fans, CPAP, routers
- 1,000Wh+: add a full-size fridge (overnight), a TV, small appliances
- 2,000Wh+: add a window AC (briefly), power tools, home backup combos
- Not compatible: anything 240V, electric dryers, water heaters, central HVAC
If you’re still figuring out which station to buy, start with our breakdown of the best portable power stations for every budget and use case. It’ll save you from buying too small — or spending more than you need to.
Frequently Asked Questions
Can a portable power station run a refrigerator?
Yes, but it depends on the station size. A 1,000Wh unit can run a standard full-size fridge for 8–12 hours. The bigger challenge is the compressor’s startup surge, which can briefly hit 1,500–2,200W. Your station’s surge watt rating needs to exceed that spike or the fridge won’t start at all. Always check surge specs, not just continuous output, before using a power station with a refrigerator.
Can a portable power station run a CPAP machine?
Yes. A CPAP machine without a humidifier draws around 30–50W, meaning even a 300Wh station can power it through a full night. With a heated humidifier, consumption climbs to 60–120W, so you’ll want at least 500Wh for an overnight run. Many CPAP machines also have a 12V DC input, which is more efficient than AC and extends runtime further.
Can a portable power station run an air conditioner?
A portable power station can run a small window AC unit (600–1,000W running wattage), but only on a 2,000Wh+ station with a high surge rating. Runtime is typically 2–3 hours, which is useful for cooling a room before bed but not for sustained use. Central air conditioners and whole-home heat pumps are 240V systems and are not compatible with any portable power station.
How many devices can I run at once on a portable power station?
As many as you want, as long as the total wattage of everything running simultaneously stays below the station’s continuous AC output. If your station outputs 1,000W continuously and your devices draw 800W combined, you’re fine. Go over that limit and the station’s inverter shuts off to protect itself. Add up your device wattages before plugging in multiple things at once.
How long will a portable power station last on a single charge?
It depends on the capacity (Wh) and what you’re running. A 1,000Wh station running a 50W TV lasts around 18–20 hours. The same station running a 500W appliance lasts about 1.5–2 hours (accounting for inverter efficiency loss). Use the formula: (Station Wh × 0.8) ÷ Device Watts = approximate runtime in hours. For extended use, pair your station with solar panels to recharge while you run it.
