Portable power
Size a portable power station to the devices you actually run
Buying a portable power station without doing the math is like packing a cooler with no ice and hoping for the best. Two numbers decide whether it actually works for you. Capacity in watt-hours says how long your gear lasts. Rated AC output in watts says whether a device will even start. Match both to a real list of what you’ll plug in before you buy.
We’ll walk the camping and small-device backup math first. Then we’ll map those numbers onto a few U.S. capacity tiers (with soft example models) so you can pick a station that fits your list, not the shiny one that looks tough in the product photo.
Two numbers that matter
Capacity (Wh) is how much energy is stored. Think of it as the size of the gas tank, not the horsepower. Rough planning formula:
Wh needed ≈ (device watts × hours of use) for each device, summed, then × 1.15–1.20 for inverter loss and surprise use
(That buffer is for the stuff you forgot you plugged in. Everyone has that stuff.)
Continuous AC output (W) is how much power the station can deliver at once on AC. Your highest simultaneous running load has to stay under that rating. Devices with motors (compressors, some pumps) can also need a short surge above running watts (check the device label). A kettle does not care how big your battery is if the outlet can’t feed it.
USB-C and 12V DC loads often bypass the AC inverter and can be more efficient. Use the port that fits the device when you can. Straight path, less drama.
Planning wattages (assumptions, not lab tests)
Grab the watts off your own device labels when you have them. The figures below are common planning ranges for sizing only. We have not lab-tested these loads for this page. They’re the “rough map,” not a GPS with live traffic.
| Device | Planning watts (running) | Notes |
|---|---|---|
| Phone charge | 10–20 W | Short sessions; small Wh total |
| Tablet charge | 20–30 W | |
| Laptop (USB-C) | 45–65 W | Workload and battery state change draw |
| LED lantern / string lights | 5–15 W | Evening use |
| Wi-Fi router | 10–20 W | Steady overnight backup load |
| Portable fan | 10–40 W | |
| 12V compressor cooler / camping fridge | 30–60 W while running | Cycles on/off; daily Wh ≠ watts × 24 |
| Mini fridge (AC) | 60–100 W while running | Cycles; surge can be higher |
| Coffee maker / kettle | 800–1,200 W | Short bursts; output rating is the gate |
Not modeled here: whole-home HVAC, electric heat, EV charging, or non-U.S. purchase paths. (If you’re trying to run central air off a camping battery, this page cannot help you, and neither can optimism.)
Worked scenario A: weekend camping (cooler + phones + lights + laptop)
Here’s one assumed camping day for planning (cooler included, because a weekend without cold drinks is a different kind of math problem):
- 12V cooler: 45 W × 10 hours compressor-on equivalent → 450 Wh
- Two phones: 20 W × 2 hours → 40 Wh
- LED lights: 10 W × 4 hours → 40 Wh
- Laptop: 60 W × 2 hours → 120 Wh
Subtotal: 650 Wh
With ~20% buffer: ≈ 780 Wh capacity target
Simultaneous AC/DC peak to check: cooler + laptop + lights land under about 150 W continuous in this mix (well below mid-size station ratings). A 1,000 W kettle would fail the AC gate even if capacity looked fine. Big tank, tiny hose. Still no tea.
Sizing takeaway: a station in the ~700–1,000 Wh band fits this camping day with headroom. Smaller ~250 Wh units cover phones and lights, not a cooler-heavy day. Cute brick, wrong job.
Worked scenario B: small-device home backup (router + phones + laptop + lights)
Same idea for a 12-hour essentials window (the “keep the house talking to the internet” set, not the whole kitchen):
- Wi-Fi router: 15 W × 12 hours → 180 Wh
- Phones (2): 20 W × 3 hours → 60 Wh
- Laptop: 60 W × 4 hours → 240 Wh
- LED lights: 15 W × 4 hours → 60 Wh
Subtotal: 540 Wh
With ~20% buffer: ≈ 650 Wh capacity target
Simultaneous peak: usually under 100 W if you stagger charging. (Charge everything at once and you’re auditioning for a sad Christmas-tree-light moment.)
Sizing takeaway: ~500–800 Wh covers this essentials mix for about half a day to a day of light use. Add a cycling fridge and you jump toward 1,000 Wh+. Fridges are the plot twist.
Example capacity tiers (U.S., merchant-sourced)
Once your Wh math and peak watts are clear, match them to a capacity band. The ratings below come from EcoFlow’s U.S. product materials / user manuals (not independent testing). They’re soft examples of common U.S. tiers, not a ranked shortlist. Confirm the live product page before you buy. We do not guarantee runtime; your real hours depend on load, temperature, and battery state. Specs are the menu. Your devices write the bill.
| Tier (approx.) | Capacity | Continuous AC (U.S.) | Fits when your math says… | Soft example |
|---|---|---|---|---|
| Light day kit | 256 Wh | 300 W (manufacturer lists higher short-term output with X-Boost) | Phones, lights, laptop top-ups; no cooler-heavy day | EcoFlow RIVER 2 |
| Weekend camping / essentials | 768 Wh | 800 W | Scenario A–B range; cycling 12V cooler + devices | EcoFlow RIVER 2 Pro |
| Fridge-class headroom | 1,024 Wh | 1,800 W | Higher simultaneous AC loads + more Wh reserve | EcoFlow DELTA 2 |
Pick the tier that clears both your Wh total (with buffer) and your highest simultaneous watt draw. If a device’s label watts exceed the station’s continuous AC rating, more capacity alone won’t save the purchase. You can’t out-Wh a wattage problem.
Next step
Once your load list and Wh math are clear, check U.S. portable power options in the tier that matches and confirm live specs on the merchant product page before you buy. Do the list first. Shopping second. Your future self at the campsite will send a thank-you text (if the phone still has charge).
Do your own homework before you buy. (The smart lawyer guys insist.)