What Can a Portable Power Station Run? (2026 Runtime Guide)
August 3, 2026 · 7 min read
A portable power station is a big rechargeable battery with regular wall outlets and USB ports built in. One number decides what it can run and for how long: watt-hours. Here is how to read that number, plus honest runtimes for what a compact 296Wh, 300W unit actually powers, and what it cannot.
The one formula that answers everything
Two specs matter. Capacity in watt-hours (Wh) is how much energy the station stores. The AC output in watts (W) is the biggest load it can power at once. To estimate runtime, use: hours ≈ (capacity in Wh × 0.85) ÷ the device's watts, where 0.85 covers conversion loss. A 296Wh station has roughly 250Wh usable, so a 40W device runs about 6 hours and a 10W router runs about 25 hours. The output rating is a hard ceiling: anything that draws more than 300W will not run at all, and a few devices spike above their running watts at startup.
Can a portable power station run a CPAP?
Yes, and it is one of the best uses for a compact unit. Most CPAP machines draw 30 to 60W with the heated humidifier and heated hose turned off, so a 296Wh station gives roughly 5 to 8 hours, enough for a full night. Two tips stretch it further: turn the humidifier and heater off, and run the CPAP from the DC or USB-C output if your model supports it, which skips the AC conversion loss and adds runtime. For several nights off-grid, recharge by day with a solar panel.
Can it power Starlink?
Standard Starlink draws about 50 to 75W, so a 296Wh unit runs it roughly 3 to 4 hours. Starlink Mini is far lighter at about 20 to 40W, which stretches to 6 to 10 hours and makes a compact station a good match for Mini on a camping trip or during an outage. For all-day internet, pair the station with a solar panel so it refills while you use it.
Electric blankets, laptops, phones, and lights
This size shines with low-draw gear. A low-to-medium electric blanket pulls 50 to 100W, giving about 2.5 to 5 hours. A laptop charger draws 45 to 65W, good for several hours of work or a couple of full charges. Phones sip power, so a 296Wh unit tops up a typical phone 15 to 20 times. LED lights, a WiFi router, a small fan, or a CPAP are right in the sweet spot.
Camping and overlanding
For camping or overlanding, a compact station covers the essentials at once: lights, phones, a laptop, a CPAP, a small 12V cooler, and drone or camera batteries. It recharges from your car on the drive in or from a solar panel at camp. Match capacity to the trip. A 296Wh unit suits a weekend for one or two people who keep loads small, while a longer trip or a group wants more capacity or a solar panel to top up daily.
What a compact power station cannot run
The 300W ceiling rules out high-wattage appliances. A space heater, hair dryer, microwave, toaster, coffee maker, kettle, or full-size fridge each draw 1000W or more and will not run on a 300W station. Watch startup surge too: a pellet stove igniter or a fridge compressor can spike well above its running watts for a moment and trip a smaller unit. If you need those, step up to a 1000W-plus station. For low-draw electronics, a 296Wh, 300W unit is the right tool for the job.
Frequently asked questions
How long will a 296Wh power station run a CPAP?
Roughly 5 to 8 hours with the heated humidifier and hose off, which covers a typical night. Running the CPAP from the DC or USB-C port instead of the AC outlet adds time by skipping the conversion loss.
How do I know if my device will run on it?
Check the device's watts, listed on its label or charger, against the station's output rating. If the running watts are under 300W it will run, and you can divide the usable capacity (about 250Wh) by the watts to estimate the hours.
Can you use a power station while it is charging?
Many support pass-through, so you can charge from solar or a wall outlet while powering a device at the same time. Confirm your model lists pass-through if you plan to top up and use it together.
Our pick
- 296Wh Portable Power Station with 300W AC Outlets, Solar Ready ($169.99): 296Wh and 80,000mAh with four AC outlets, 100W USB-C, and solar-ready charging, sized for a CPAP, Starlink Mini, laptops, and camp lighting.
Bottom line
Read the watt-hours for runtime and the output watts for what it can power at once. A compact 296Wh, 300W station is ideal for a CPAP, internet, laptops, phones, and lights off-grid or in an outage, but not for heat-producing appliances. See more on the Camping & Outdoor page and the wider Power Banks & Chargers collection. Every order ships from a US warehouse, with most arriving in 5 to 7 business days and free shipping over $99.