How long will a power station run my window air conditioner?
How long does the window unit run on one charge?
How long the window unit runs depends on its running watts, the station's watt-hour capacity, and inverter efficiency.
Running watts here are cooling capacity divided by the published CEER.
This page uses the BLUETTI Elite 200 V2 at 2,073.6 watt-hours and 2,600 watts continuous, as of October 5, 2026.
Published specs
| Item | Spec | Value |
|---|---|---|
| Midea MAW05R1KWT-B, 5,000 Btu/h | Load | Window unit, 5,000 Btu/h, CEER 14.4, 260.4 kWh/yr, 115 V, as of October 5, 2026 |
| BLUETTI Elite 200 V2 | Capacity | 2,073.6 watt-hours, as of October 5, 2026 |
| BLUETTI Elite 200 V2 | Output | 2,600 watts, as of October 5, 2026 |
| BLUETTI Elite 200 V2 | Chemistry | LiFePO4, as of October 19, 2026 |
| BLUETTI Elite 200 V2 | Weight | 53.4 lb, as of October 19, 2026 |
A BLUETTI Elite 200 V2 at 2,073.6 watt-hours and 85% inverter efficiency runs this Midea MAW05R1KWT-B, 5,000 Btu/h, for about 5.1 hours with the compressor treated as on the whole time. As of October 5, 2026.
ENERGY STAR lists the Midea MAW05R1KWT-B as a window unit, 5,000 Btu/h, CEER 14.4, 260.4 kilowatt-hours a year, at 115 volts. Running watts here are 5,000 divided by 14.4. ENERGY STAR does not publish start watts. As of October 5, 2026.
The compressor can draw more current for a moment when it starts. ENERGY STAR does not publish start watts for this model, so these hours do not say the station can start it. As of October 5, 2026.
Estimated runtime
Short run
5.1 hours with the compressor treated as on the whole time
2,073.6 watt-hours at 85% inverter efficiency is 1762.6 watt-hours delivered. This load averages 347.22 watts. 1762.6 divided by 347.22 is about 5.1 hours.
Assumption: inverter efficiency is 85%.
A start surge is not published for this preset. These hours are the running load only.
A clamp meter with an inrush or max-current mode, used with an AC line splitter so the clamp goes around a single conductor, can measure startup current. Multiply those amps by the volts on the line to get a rough watts figure.
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Running watts are 5,000 divided by the published CEER of 14.4. That is capacity divided by CEER, not a separate nameplate watt line. ENERGY STAR also lists 260.4 kilowatt-hours a year. Duty stays at 100 percent, a worst case with the compressor on. Start watts are not published. The Elite 200 V2 continuous rating of 2,600 watts covers this running load. Start coverage is not claimed.
Worked example
Midea MAW05R1KWT-B, 5,000 Btu/h on the BLUETTI Elite 200 V2 (2,073.6 watt-hours) at 85% inverter efficiency. Specs in this example are as of October 5, 2026.
| Step | Figure |
|---|---|
| Running watts | 347.22 watts |
| Duty cycle | 100 percent of the hour. Worst case, runs nonstop. |
| Average watts | 347.22 x 1.00 = 347.22 watts |
| Nameplate volts | 115 volts |
| Delivered watt-hours | 2,073.6 x 0.85 = 1762.6 |
| Hours | 1762.6 / 347.22 = about 5.1 |
Result: about 5.1 hours with the compressor treated as on the whole time.
Assumptions
| Assumption | Value | Note |
|---|---|---|
| Inverter efficiency | 85%, as of October 5, 2026 | Starting assumption for AC output. |
| Running watts | 5,000 / 14.4, as of October 5, 2026 | Cooling capacity divided by the published CEER. Not a separate nameplate watt line. |
| Annual energy | 260.4 kilowatt-hours a year, as of October 5, 2026 | Published on the same ENERGY STAR row. The hour estimate uses capacity divided by CEER, not this annual total. |
| Duty cycle | 100 percent. Worst case, compressor on, as of October 5, 2026 | No published cycle, so the default stays at 100 percent. A real unit cycles. Change the percent only if you know yours. |
| Start watts | Not published, as of October 5, 2026 | ENERGY STAR does not publish start watts. Nothing is invented for locked-rotor amps. |
| Elite 200 V2 | 2,073.6 watt-hours, 2,600 watts continuous, as of October 5, 2026 | 2,600 watts continuous covers the running load from capacity divided by CEER. Start coverage is not claimed. |
Questions
How long will the Elite 200 V2 run this window unit if the compressor stays on?
About 5.1 hours at 85 percent inverter efficiency, 5.1 hours, with the compressor treated as on the whole time. 2,073.6 watt-hours times 0.85 is 1762.6 watt-hours. Running watts are 5,000 divided by 14.4, about 347.22 watts. 1762.6 divided by that is about 5.1 hours. The 2,600 watt continuous rating covers that running load. Start watts are not published, so start coverage is not claimed. As of October 5, 2026.
Where do the watts come from?
ENERGY STAR lists 5,000 Btu/h and a CEER of 14.4 for the Midea MAW05R1KWT-B. This page divides capacity by that CEER. It is not a separate nameplate watt line. The same row lists 260.4 kilowatt-hours a year, which is not the running-watt input. As of October 5, 2026.
Does this include the compressor start?
No. ENERGY STAR does not publish start watts for this model. The hours are the running estimate only. A clamp meter can measure startup current on a corded window unit. As of October 5, 2026.
Sources
Updated .
- Midea MAW05R1KWT-B (ENERGY STAR pd_id 4710514)ENERGY STAR lists the Midea MAW05R1KWT-B as a window unit, 5,000 Btu/h, CEER 14.4, 260.4 kilowatt-hours a year, at 115 volts. Running watts here are 5,000 divided by 14.4. ENERGY STAR does not publish start watts. As of October 5, 2026.
- BLUETTI Elite 200 V2BLUETTI lists the Elite 200 V2 at 2,073.6 watt-hours and 2,600 watts continuous AC at 120 volts. As of October 5, 2026.