How long will an EcoFlow RIVER Pro run a window air conditioner, 5,000 BTU?
About an hour — 1 h 23 min typically, from 1 h 18 min in the worst case to 1 h 28 min at best. That assumes a window air conditioner, 5,000 BTU pulling 500 W for 70% of the time (average 350 W), plus the station's 10 W AC mains socket overhead — 360 W in total out of 496 usable watt-hours.
The smallest common window unit and the only one a mid-sized station handles for a few hours.
The numbers
| Setup | Average draw | Cautious | Typical | Best case |
|---|---|---|---|---|
| 1 × window air conditioner, 5,000 BTU, UK 230 V | 360 W | 1 h 18 min | 1 h 23 min | 1 h 28 min |
| 2 × window air conditioner, 5,000 BTU, UK 230 V | 710 W | — | — | — |
| 1 × window air conditioner, 5,000 BTU, US 120 V | 360 W | 1 h 18 min | 1 h 23 min | 1 h 28 min |
- 0.2 nights of eight hours, or 0.06 days of continuous running.
- Usable energy: 496 Wh of the 720 Wh on the box, after chemistry, inverter losses and the reserve.
- To keep it going for a full 24 hours you would need about 11,889 Wh of rated capacity — 16.5× this station.
- Start-up: the window air conditioner, 5,000 BTU asks for 1,200 W at switch-on against this station's 1,200 W peak — comfortable.
Buy the EcoFlow RIVER Pro
Where to buy
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If this is for a power cut
In a summer outage, cooling is what a battery struggles with most. A rechargeable fan by the bed runs for hours on its own battery and costs far less than running an air conditioner from a station.
Rechargeable fan. After a hurricane the power can stay off for days in heat and humidity. A battery fan by the bed is what makes the nights bearable, and it runs for hours from a power bank.
Look for: USB-C charging, a stated runtime on low, and a clip or stand so it can sit close to you.
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More: Hurricane power outage checklist, and the power cut essentials list (US edition).
What changes the answer
| If instead… | Typical runtime | Change |
|---|---|---|
| The pack is two years old | 1 h 16 min | -8% |
| The pack is five years old | 1 h 6 min | -20% |
| It is −10 °C outside | 1 h 6 min | -20% |
| You run it flat, no reserve | 1 h 32 min | +11% |
| You keep 20% back | 1 h 13 min | -12% |
If you need it to run longer
These run a window air conditioner, 5,000 BTU for at least twice as long as the EcoFlow RIVER Pro does, cheapest first.
| Station | Wh | Typical | Indicative price |
|---|---|---|---|
| Jackery Explorer 2000 v2 | 2,042 | 4 h 5 min | £849 / $999 |
| Bluetti AC180P | 1,440 | 2 h 53 min | £899 / $649 |
| OUKITEL P2001 Ultimate | 2,000 | 4 h | £999 / $1,099 |
| Bluetti AC240 | 1,536 | 3 h 4 min | £1,099 / $999 |
The cheapest step up: Jackery Explorer 2000 v2
Amazon and approved-programme links are affiliate links; the site may earn a commission at no extra cost to you. Links marked “official site” are untracked. Prices and stock change constantly — check before you buy.
Smaller options that still work
| Station | Wh | Typical | Weight | Indicative price |
|---|---|---|---|---|
| Bluetti EB70S | 716 | 1 h 27 min | 9.7 kg | £449 / $429 |
| UGREEN PowerRoam 600 | 680 | 1 h 23 min | 8.4 kg | £449 / $499 |
| Jackery Explorer 600 Plus | 632 | 1 h 17 min | 7.3 kg | — |
| EcoFlow RIVER 3 Max | 512 | 1 h 2 min | 6.6 kg | — |
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