Choosing a Portable Power Station: Watts, Watt-Hours, and Plain Math
Last verified: August 2026
Storm outages are a fact of life here in Portage County. A portable power station keeps your essentials going — but the labels (watts, watt-hours) confuse everyone. Here's the plain math.
Watts vs. Watt-Hours, Plainly
A portable power station is a big rechargeable battery in a box, with regular wall outlets and USB ports on the front. You charge it up ahead of time, and when the power goes out you plug your essentials into it — no fumes, no noise, safe to use indoors.
Two numbers matter. Watts (W) tell you how much it can power at one moment — a small unit might do 300 watts, a big one 2,000+. Watt-hours (Wh) tell you how long it lasts — think of it like the size of the gas tank. A 1,000Wh unit can run a 100-watt load for roughly 10 hours.
The simple math: add up the watts of what you want to run, make sure that total is below the station's watt rating, then multiply your load by the hours you need to get the watt-hours you should buy. Common sizes are around 500Wh (phones, a lamp, Wi-Fi), 1,000–2,000Wh (add a CPAP or a fridge for a while), and 3,000Wh+ for longer, bigger needs.
When to skip the DIY and just call: You want help picking the right size for YOUR essentials · You're powering a medical device and can't afford to guess · You want it delivered, charged, and labeled so you're ready before the next storm.
Common Questions
1 How do I figure out what size I need?
- List what you must run: e.g., phone (10W), Wi-Fi router (15W), a lamp (10W), a CPAP (40W).
- Add the watts up to make sure they're under the station's watt rating.
- Multiply your total watts by the hours you need. 75 watts for 8 hours is 600 watt-hours.
- Buy a station with more watt-hours than that number, for a safety margin.
2 What can a common size actually run?
- About 300–500Wh: phones, tablets, Wi-Fi, a lamp, a laptop — the communication essentials.
- About 1,000–2,000Wh: adds a CPAP overnight, a small fridge for a while, or medical chargers.
- About 3,000Wh+: runs more at once and for longer, edging toward whole-essentials backup.
- A fridge and anything with a heating element (kettle, heater) draw a LOT — check those watts carefully.
3 What features should I look for?
- "Pure sine wave" output — important for sensitive electronics and medical devices.
- LiFePO4 battery chemistry (used by EcoFlow, Anker, Bluetti) lasts far more charge cycles and years than older lithium.
- Enough of the right outlets (wall plugs, USB-C, USB-A) for your devices.
- The option to recharge from a wall outlet, the car, or a solar panel.
4 What can't a power station do?
- It won't run your whole house — big loads like central A/C, an electric water heater, or an electric stove are out of reach for portable units.
- It's for essentials: communication, medical devices, a fridge, lights, and charging.
- For whole-home backup, that's a standby generator or a home battery — a different guide.
5 How do I keep it ready?
- Keep it charged to around 80–100% and top it up every few months.
- Store it somewhere cool and dry, not a freezing garage in deep winter.
- Test it a couple of times a year by running your essentials off it.
- Label the cords so you're not puzzling it out by flashlight during a storm.
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