How many watts does an inverter window air conditioner use?

Cooling Also called: inverter window ac, u-shaped window air conditioner, u shaped window ac

Two numbers decide whether a power station runs an inverter window air conditioner (U-shaped), and readers arrive using them interchangeably. Watts are the ceiling on what the inverter can hold at any instant — this load needs 667 W of them while it runs. Watt-hours are how much energy the battery holds. A machine can have plenty of one and not enough of the other.

Of the 26 station records we publish — every model we hold a page for, with its US and EU versions counted separately — 8 run it, 3 are a tight fit and 15 are out of reach. Each of those is a calculation against that machine’s continuous output, its surge ceiling and its inverter waveform — not a lookup table — and the reasoning is on every row.

The three numbers a power station is judged against

Running power 667 W 500–800 W Derived from official coefficients · verified 2026-08-03 · medium confidence

Start-up surge Not found in the sources we checked no figure to date

Duty cycle Not found in the sources we checked no figure to date

The band is the spread across real models in this class, not a tolerance. Size against the top of it unless you know which unit you own.

Start-up figure: No start-up figure found

We read 4 documents for this class on 2026-08-03 and found no published start-up figure in them. This library does not invent one: where a start-up check is required, the engine caps the verdict below green rather than assuming the machine starts cleanly.

Derived from official coefficientsverified 2026-08-11appliance record

What actually decides it

A variable-speed motor: it ramps instead of slamming

This compressor is fed by its own electronics, which start it gently and then modulate its speed to the work in front of it. The start-up peak is small or absent, and the running draw is a band rather than a point — low most of the time, climbing only under load. The binding constraint is usually the top of that band, not the start.

What kind of motor is inside

The motor is brushless and driven by its own inverter board, which is why the start-up demand is modest: the electronics ramp the motor rather than connecting it straight to the line.

There is no start-up figure, and there should not be

Nothing here has a locked rotor to publish a figure for: a heating element, a switch-mode supply and a variable-speed drive all start without an inrush worth rating. The absence of a start-up number on this record is a fact about the hardware rather than a hole in the library, so the engine does not cap any verdict below for it — which is the opposite of what it does when a figure is genuinely missing.

Why this page gives no runtime in hours

A runtime is usable watt-hours divided by an average power, and an average power is only a real quantity when the running watts and the duty cycle describe the same thing. For this load they do not — the two figures come from sources measuring different quantities — so their product is a number that describes nothing while looking exactly as confident as one that does. This site will not print it. What every row below gives instead is the draw while the machine is running, which multiplies nothing and is the figure you can actually size against.

Which power stations run it

Every row is a live calculation against that machine's continuous output, surge ceiling and inverter waveform. Of the 26 station records we publish — US and EU versions counted separately — 8 run it, 3 are a tight fit and 15 are out of reach. The percentage is this load as a share of that machine's continuous output; anything past 82% drops out of the green. Rows are ordered by verdict, then by price — cheapest first inside each band.

BLUETTI Elite 100 V2 BLUETTI · US 120 V 1,800 W continuous · 3,600 W surge ceiling Runs it37%

Jackery Explorer 1000 v2 Jackery · US 120 V 1,500 W continuous · 3,000 W surge ceiling Runs it44%

EcoFlow DELTA 3 Plus EcoFlow · US 120 V 1,800 W continuous · 3,600 W surge ceiling Runs it37%

BLUETTI Elite 200 V2 BLUETTI · US 120 V 2,600 W continuous Runs it26%

667 Wh per hour — while it is actually running — deliberately NOT averaged over a duty cycle No runtime in hours: this load’s running watts and its duty cycle come from sources that do not describe the same thing, so the site refuses to multiply them. We have found no published surge rating for the US 120 V build. The start-up check runs against its continuous output as a conservative floor, which is ours, not a manufacturer specification. $899 · checked 2026-08-17 Show the working →

Jackery Explorer 2000 Plus Jackery · US 120 V 3,000 W continuous · 6,000 W surge ceiling Runs it22%

Jackery Explorer 1000 Plus Jackery · US 120 V 2,000 W continuous · 4,000 W surge ceiling Runs it33%

EcoFlow DELTA 2 Max EcoFlow · US 120 V 2,400 W continuous · 4,800 W surge ceiling Runs it28%

EcoFlow DELTA Pro 3 EcoFlow · US 120 V 4,000 W continuous · 8,000 W surge ceiling Runs it17%

EcoFlow STREAM Ultra EcoFlow · US 120 V 800 W continuous Tight fit83%

limited by continuous output 667 Wh per hour — while it is actually running — deliberately NOT averaged over a duty cycle No runtime in hours: this load’s running watts and its duty cycle come from sources that do not describe the same thing, so the site refuses to multiply them. We have found no published surge rating for the US 120 V build. The start-up check runs against its continuous output as a conservative floor, which is ours, not a manufacturer specification. $1,279 · checked 2026-08-17 Show the working →

EcoFlow STREAM Ultra EcoFlow · EU 1,200 W continuous Wrong mains

limited by mains standard 667 Wh per hour — while it is actually running — deliberately NOT averaged over a duty cycle No runtime in hours: this load’s running watts and its duty cycle come from sources that do not describe the same thing, so the site refuses to multiply them. We have found no published surge rating for the EU build. The start-up check runs against its continuous output as a conservative floor, which is ours, not a manufacturer specification. €599 · checked 2026-08-17 Show the working →

Anker SOLIX Solarbank 3 E2700 Pro Anker SOLIX · EU 1,200 W continuous Wrong mains

BLUETTI Elite 30 V2 BLUETTI · US 120 V 600 W continuous Too big111%

EcoFlow RIVER 3 Plus EcoFlow · US 120 V 600 W continuous · 1,200 W surge ceiling Too big111%

Jackery Explorer 300 Plus Jackery · US 120 V 300 W continuous · 600 W surge ceiling Too big222%

BLUETTI Elite 30 V2 BLUETTI · EU 230 V 600 W continuous Wrong mains

limited by mains standard 667 Wh per hour — while it is actually running — deliberately NOT averaged over a duty cycle No runtime in hours: this load’s running watts and its duty cycle come from sources that do not describe the same thing, so the site refuses to multiply them. We have found no published surge rating for the EU 230 V build. The start-up check runs against its continuous output as a conservative floor, which is ours, not a manufacturer specification. €219 · checked 2026-08-17 Show the working →

Anker SOLIX C300 Anker SOLIX · EU 230 V 300 W continuous · 600 W surge ceiling Wrong mains

Jackery Explorer 300 Plus Jackery · EU 230 V 300 W continuous · 600 W surge ceiling Wrong mains

EcoFlow RIVER 3 Plus EcoFlow · EU 230 V 600 W continuous · 1,200 W surge ceiling Wrong mains

Jackery Explorer 1000 v2 Jackery · EU 230 V 1,500 W continuous · 3,000 W surge ceiling Wrong mains

BLUETTI Elite 100 V2 BLUETTI · EU 230 V 1,800 W continuous Wrong mains

limited by mains standard 667 Wh per hour — while it is actually running — deliberately NOT averaged over a duty cycle No runtime in hours: this load’s running watts and its duty cycle come from sources that do not describe the same thing, so the site refuses to multiply them. We have found no published surge rating for the EU 230 V build. The start-up check runs against its continuous output as a conservative floor, which is ours, not a manufacturer specification. €579 · checked 2026-08-17 Show the working →

EcoFlow DELTA 3 Plus EcoFlow · EU 230 V 1,800 W continuous · 3,600 W surge ceiling Wrong mains

EcoFlow DELTA 2 Max EcoFlow · EU 230 V 2,400 W continuous · 4,800 W surge ceiling Wrong mains

Jackery Explorer 1000 Plus Jackery · EU 230 V 2,000 W continuous · 4,000 W surge ceiling Wrong mains

BLUETTI Elite 200 V2 BLUETTI · EU 230 V 2,600 W continuous Wrong mains

limited by mains standard 667 Wh per hour — while it is actually running — deliberately NOT averaged over a duty cycle No runtime in hours: this load’s running watts and its duty cycle come from sources that do not describe the same thing, so the site refuses to multiply them. We have found no published surge rating for the EU 230 V build. The start-up check runs against its continuous output as a conservative floor, which is ours, not a manufacturer specification. €1,149 · checked 2026-08-17 Show the working →

Jackery Explorer 2000 Plus Jackery · EU 230 V 3,000 W continuous · 6,000 W surge ceiling Wrong mains

EcoFlow DELTA Pro 3 EcoFlow · EU 230 V 4,000 W continuous · 8,000 W surge ceiling Wrong mains

Which one to buy, ranked

Our pick for this load

BLUETTI Elite 100 V2 · US 120 V

The cheapest US 120 V machine in the list that runs an inverter window air conditioner (U-shaped) outright, and it holds it at 667 Wh per hour.

$499 · price checked 2026-08-17

The buy link is in the bar at the bottom of the screen — one action per page, and it goes to the merchant we last checked the price at.

What changes the numbers

Mains standards on record US 120 V The figures above are recorded per mains standard, because the same appliance class is built differently on 120 V and 230 V. Where only one standard is on record, the ranking still lists machines from both regions — each row states its own.

Everything else we hold on this load

Each figure carries the tier it came from and the date it was checked. Sizing guidance is kept apart from measured draw on purpose: one says what the machine pulls, the other says what a manufacturer or a standard thinks you should buy for it.

Measured and published draw

Energy per year 500 kWh Official spec · verified 2026-08-03 · high confidence

Published on the voluntary certification programme's public register, not a government label.

Sizing guidance — not a draw figure

Minimum continuous output 800 W Official spec · verified 2026-08-03 · medium confidence

A sizing figure, not a draw: it is what this class needs a machine to be RATED at, headroom included.

Where to go next

From the Knowledge channel

An inverter window air conditioner (U-shaped) has a dedicated guide: the same records this page computes from, worked through in prose with room for the reasoning a table can only summarise — How do you stay cool in a summer power outage?

Questions people ask about this load

How many watts does an inverter window air conditioner (U-shaped) use?

667 W while it is running, and 500–800 W across the models in this class. Those are different questions and most pages answer only the first. The running figure decides whether a machine can hold it; the start-up figure decides whether it can get it going at all, and it is usually the one that fails. We read 4 documents for this class on 2026-08-03 and found no published start-up figure in them.

What size power station do I need for an inverter window air conditioner (U-shaped)?

For an inverter window air conditioner (U-shaped), the BLUETTI Elite 100 V2 (US 120 V) is the cheapest machine in our library that runs it, at 1,800 W continuous · 3,600 W surge ceiling and $499 against a running draw of 667 W. That is a verdict computed from this load’s running watts, its start-up demand and the inverter waveform — not a rule of thumb about doubling the wattage. 8 of 26 machines clear it, 1 is a tight fit, the tight one is tight for reasons the list states individually, and 2 are capped below green rather than shown to run it — this load states which mains standard it is built for and we hold no AC output voltage for those builds, so the two were never compared, and a check that could not be run is not a check that passed.

How long will a power station run an inverter window air conditioner (U-shaped)?

We will not put hours on an inverter window air conditioner (U-shaped), and that is a finding rather than a gap. Hours require an average power, and an average power requires that the running watts and the duty cycle on this record describe the same thing. Someone checked this record, and they do not — multiplying them produces a figure that looks authoritative and describes nothing. What every row above gives instead is 667 W of actual running draw, expressed per hour: it multiplies nothing, and it is the number to size a battery against.

Which power stations run an inverter window air conditioner (U-shaped)?

8 of the 26 we hold, listed above cheapest-first within each verdict band, starting with the BLUETTI Elite 100 V2. 1 more is a tight fit on an inverter window air conditioner (U-shaped) — they run it, but with less headroom than we are willing to call comfortable — 2 are amber for a different reason, and 15 cannot. Those 2 are a withheld verdict rather than a narrow pass: this load states which mains standard it is built for and we hold no AC output voltage for those builds, so the two were never compared, so the check that would settle them never ran — and a pairing cannot earn a green verdict from silence. Read them as not established, rather than as established by a thin margin.