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How long will a power station run a window air conditioner?

Last reviewed 2026-10-26

Quick answer

A 5,000 BTU window AC averages about 380 W once it starts cycling, so a 1,000 Wh station runs it for roughly 2¼ hours and a 3,000 Wh station for nearly 7 hours. An 8,000 BTU unit cuts those times by about a third. The station also needs enough surge capacity to start the compressor.

Calculate your runtime

Powering through
Wh

Printed on the station or in its specs, in watt-hours (Wh).

W

Continuous output, not the surge or peak figure.

What will you power?

  • Cycles on and off: runs at about 450 W, averaging 380 W.

Estimated runtime

2 h 17 min

from 100% to empty

Average load

380 W

what drains the battery

Peak load

1,200 W

450 W running + startup surge

Uses 85% of the rated 1,024 Wh to cover inverter and conversion losses. Real runtime varies with temperature, battery age and how often appliances cycle.

Compare this load across popular power stations
Power stationCapacityRuntimeCan it run all at once?
EcoFlow River 3245 Wh—No (300 W max)
EcoFlow River 2256 Wh—No (300 W max)
Jackery Explorer 240 v2256 Wh—No (300 W max)
EcoFlow River 3 Plus286 Wh38 minCheck surge rating
Jackery Explorer 300 Plus288 Wh—No (300 W max)
Jackery Explorer 600 v2640 Wh1 h 26 minCheck surge rating
EcoFlow River 2 Pro768 Wh1 h 43 minYes
Anker SOLIX C800 Plus768 Wh1 h 43 minYes
Bluetti AC70768 Wh1 h 43 minYes
EcoFlow Delta 21,024 Wh2 h 17 minYes
EcoFlow Delta 31,024 Wh2 h 17 minYes
EcoFlow Delta 3 Plus1,024 Wh2 h 17 minYes
Anker SOLIX C1000 Gen 21,024 Wh2 h 17 minYes
Bluetti Elite 100 V21,024 Wh2 h 17 minYes
Anker SOLIX C10001,056 Wh2 h 22 minYes
Jackery Explorer 1000 v21,070 Wh2 h 24 minYes
Bluetti AC1801,152 Wh2 h 35 minYes
Jackery Explorer 1000 Plus1,264 Wh2 h 50 minYes
Jackery Explorer 1500 v21,536 Wh3 h 26 minYes
Jackery Explorer 2000 v22,042 Wh4 h 34 minYes
Jackery Explorer 2000 Plus2,042 Wh4 h 34 minYes
EcoFlow Delta 2 Max2,048 Wh4 h 35 minYes
EcoFlow Delta 3 Max2,048 Wh4 h 35 minYes
Anker SOLIX F2000 (767)2,048 Wh4 h 35 minYes
Bluetti AC200L2,048 Wh4 h 35 minYes
Bluetti Elite 200 V22,074 Wh4 h 38 minYes
Jackery Explorer 3000 v23,072 Wh6 h 52 minYes
EcoFlow Delta Pro3,600 Wh8 h 3 minYes
Anker SOLIX F38003,840 Wh8 h 35 minYes
EcoFlow Delta Pro 34,096 Wh9 h 10 minYes
Jackery Explorer 5000 Plus5,040 Wh11 h 16 minYes

Manufacturer specs. Confirm current figures on the brand's site before buying.

Runtime by power station size: Window AC, 5,000 BTU

Window AC, 5,000 BTU: about 380 W average (250–500 W range), AC outlets at 85% efficiency, from full to empty.
Power station sizeTypical runtimeRealistic range
300 Wh40 min0.5–1.0 h
500 Wh1 h 7 min0.8–1.7 h
1,000 Wh2 h 14 min1.7–3.4 h
1,500 Wh3 h 21 min2.5–5.1 h
2,000 Wh4 h 28 min3.4–6.8 h
3,000 Wh6 h 43 min5.1–10.2 h

Runtime by power station size: Window AC, 8,000 BTU

Window AC, 8,000 BTU: about 580 W average (400–750 W range), AC outlets at 85% efficiency, from full to empty.
Power station sizeTypical runtimeRealistic range
300 Wh26 min0.3–0.6 h
500 Wh44 min0.6–1.1 h
1,000 Wh1 h 28 min1.1–2.1 h
1,500 Wh2 h 12 min1.7–3.2 h
2,000 Wh2 h 56 min2.3–4.3 h
3,000 Wh4 h 24 min3.4–6.4 h

Air conditioning is a big ask for a battery

After space heaters, air conditioners are the hardest appliance to run on battery power. A window unit's compressor draws 400–850 W while running and cycles on and off as the room cools. In a heat wave, with the sun on the windows, it may run almost continuously, so expect the shorter end of the ranges below.

Startup surge: the reason AC units trip power stations

A conventional window AC can pull 2–3× its running watts for a moment when the compressor starts. A 5,000 BTU unit may spike to around 1,200 W. That's fine for stations rated 1,500 W and up, but too much for most 300–800 W models.

Getting more cooling from the same battery

Frequently asked questions

Can a power station run an air conditioner all night?
Only a large one. Eight hours of a 5,000 BTU unit averaging 380 W needs about 3,600 Wh of rated capacity, so you'd need a 3,600 Wh station or expansion batteries. A fan for the night is far more practical.
What size power station do I need for a window AC?
For output, at least 1,500 W continuous to handle the startup surge of a small unit. For runtime, multiply its average watts by the hours you want and divide by 0.85.
Can I run a central air conditioner on a power station?
Generally no. Central AC is usually 240 V and draws 2,000–5,000 W. Only whole-home battery systems or large 240 V power stations, connected through a transfer switch installed by an electrician, can run it.

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