How long will the BLUETTI Apex 300 run a window AC 5,000 BTU?

About 10 hours from a full charge. A window AC 5,000 BTU averages about 225 W (450 W running, on about 50% of the time), and the 2,765 Wh battery gives about 2,350 Wh after inverter losses. That is 9.6% of the battery an hour.

Will the BLUETTI Apex 300 start a window AC 5,000 BTU?

Yes. It needs about 1,350 W for a moment when the compressor starts, and the BLUETTI Apex 300 is rated for 7,680 W surge, 5.7 times that. Avoid starting other motors at the same moment.

How many days of normal use is that?

About 1 day, if you use a window AC 5,000 BTU about 8 hours a day and nothing else is plugged in.

Bluetti · Will it run?

Can the BLUETTI Apex 300 run a window AC 5,000 BTU?

Published October 15, 2026

Short answerYes

Yes. The BLUETTI Apex 300 runs a window AC 5,000 BTU for about 10 hours from a full charge. It needs about 1,350 W for a moment when the compressor starts, well within the 7,680 W surge rating, then about 450 W while running against 3,840 W continuous.

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Key numbers

Runtime: 10 hrs; from a full charge
Battery used per hour: 9.6%; at 225 W average

Window AC 5,000 BTU

Running: 450 W; 400–550 W range
Start-up: 1,350 W
Average: 225 W; on 50% of the time

BLUETTI Apex 300

Battery: 2,765 Wh; about 2,350 Wh usable
Output: 3,840 W; continuous
Surge: 7,680 W; start-up peak

How we worked it out: 2,765 Wh × 0.85 ÷ 225 W average (450 W × 0.5 duty) = about 10 hours. The 0.85 covers inverter and battery losses. We do not test units ourselves; the numbers come from the official spec sheets and typical device draws. How we pick

BLUETTI Apex 300

2,765 Wh · 3,840 W output · 7,680 W surge · 83.8 lb

Full specs and runtimes

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What else the BLUETTI Apex 300 runs

One device at a time, from a full charge.

Other power stations for a window AC 5,000 BTU

The nearest sizes that also run it.

Keep going

Real runtime depends on the model you own, room temperature and battery age. The 10 hours above is an estimate, not a measured result.

Common questions

How long will the BLUETTI Apex 300 run a window AC 5,000 BTU?: About 10 hours from a full charge. A window AC 5,000 BTU averages about 225 W (450 W running, on about 50% of the time), and the 2,765 Wh battery gives about 2,350 Wh after inverter losses. That is 9.6% of the battery an hour.
Will the BLUETTI Apex 300 start a window AC 5,000 BTU?: Yes. It needs about 1,350 W for a moment when the compressor starts, and the BLUETTI Apex 300 is rated for 7,680 W surge, 5.7 times that. Avoid starting other motors at the same moment.
How many days of normal use is that?: About 1 day, if you use a window AC 5,000 BTU about 8 hours a day and nothing else is plugged in.