What size power station do I need to run a Window AC (5,000 BTU)?

To run a Window AC (5,000 BTU) (about 500 running watts) for 5 hours, plan on a station with at least 3300 watt-hours of capacity and 500W continuous / 1500W surge output. Adjust for your real runtime.

How long will a power station run a Window AC (5,000 BTU)?

A Extra-large (≈3,600Wh) station (3600Wh) runs a Window AC (5,000 BTU) for roughly ~5.5 h on a full charge.

SizingPlate

Power stations › Window AC (5,000 BTU)

What size power station to run a Window AC (5,000 BTU)?

Typical draw: 500W running / 1500W starting. Sized below for a 5-hour run — drag the slider for your real runtime. Small bedroom unit. Compressor surge is roughly 3x running draw.

POWER PLATE1 LOAD · 5 H RUNTIME

Continuous draw

500 W

Startup surge

1,500 W

Energy for 5 h

2,941 Wh

Buy at least

3,300 Wh

Look for ≥3,300Wh capacity, ~500W continuous / 1,500W surge or better.

Right size: Extra-large (≈3,600Wh) · 3,600W

Typical price $2,000-3,200 · e.g. EcoFlow Delta Pro 3, Bluetti AC300 + B300 module

A fridge and essentials for a day or more, a 120V window AC, a home office through a long outage. Approaching generator money; the value comes from pairing it with solar so it refills each day.

Runs this load ~5.5 h on a full charge.

See current prices on Amazon

One size up: Expandable home backup (≈6,000Wh+) · 5,000W

Typical price $3,500-6,000+ · e.g. EcoFlow Delta Pro Ultra, Bluetti AC500 + B300S (stackable)

Backing up whole circuits through a transfer switch; add battery modules for days of autonomy, especially with solar. A home-backup system, not a grab-and-go unit. For 240V loads or true whole-home coverage, compare against a standby generator.

Runs this load ~9.2 h on a full charge.

See current prices on Amazon

Comparing against fuel? See what size generator runs a Window AC (5,000 BTU).

Adjust your loadout and runtime

Real setups aren't one appliance. Add loads and set your runtime below — your Window AC (5,000 BTU) is pre-checked.

POWER PLATE1 LOAD · 5 H RUNTIME

Continuous draw

500 W

Startup surge

1,500 W

Energy for 5 h

2,941 Wh

Buy at least

3,300 Wh

Look for ≥3,300Wh capacity, ~500W continuous / 1,500W surge or better.

Capacity includes inverter loss (~15%) and a usable-charge margin, so the station isn't run flat. A solar panel or vehicle charge extends runtime past this number.

How long do you need to run it? 5 h

Kitchen Refrigerator (full-size) 300W run / 1500W start Mini fridge 90W run / 700W start Chest freezer 250W run / 1200W start Microwave (1000W) 1400W run Electric range (one burner) 1500W run Coffee maker (drip) 900W run Toaster 1100W run Electric kettle 1400W run Dishwasher 1300W run / 1500W start Instant Pot / multicooker 1000W run

Heating & cooling Window AC (5,000 BTU) 500W run / 1500W start Window AC (8,000 BTU) 800W run / 2200W start Window AC (12,000 BTU) 1100W run / 3000W start Central AC (3-ton) 3500W run / 8500W start Space heater (1500W) 1500W run Furnace blower fan (gas furnace) 600W run / 1600W start Heat pump (2-ton) 2500W run / 6000W start Box fan 100W run / 150W start Ceiling fan 75W run / 100W start

Pumps & well Sump pump (1/3 HP) 800W run / 1500W start Sump pump (1/2 HP) 1050W run / 2200W start Well pump (1/2 HP) 1000W run / 2100W start Well pump (1 HP) 2000W run / 4000W start Sewage ejector pump (1/2 HP) 1000W run / 2200W start

Electronics TV (55" LED) 80W run Wi-Fi router + modem 15W run Laptop 65W run Desktop PC + monitor 350W run / 400W start Phone charger 10W run Starlink dish + router 75W run / 100W start

Medical & safety CPAP machine 60W run Oxygen concentrator 350W run / 600W start

Lighting LED lights (per room) 30W run

Laundry Washing machine 700W run / 1600W start Clothes dryer (electric) 5000W run / 6000W start Clothes dryer (gas) 700W run / 1800W start

Household Garage door opener (1/2 HP) 550W run / 1200W start Water heater (electric tank) 4500W run EV charging (Level 1, 120V) 1400W run

Tools & outdoor Circular saw 1400W run / 2300W start Air compressor (1 HP) 1500W run / 3000W start Welder (140A MIG) 3500W run / 4000W start

RV & camping RV air conditioner (13,500 BTU) 1300W run / 2900W start RV converter/charger 500W run Electric griddle 1200W run Slow cooker 250W run

Power stations that fit

Right size: Extra-large (≈3,600Wh) · 3,600W

Typical price $2,000-3,200 · e.g. EcoFlow Delta Pro 3, Bluetti AC300 + B300 module

A fridge and essentials for a day or more, a 120V window AC, a home office through a long outage. Approaching generator money; the value comes from pairing it with solar so it refills each day.

Runs this load ~5.5 h on a full charge.

See current prices on Amazon

One size up: Expandable home backup (≈6,000Wh+) · 5,000W

Typical price $3,500-6,000+ · e.g. EcoFlow Delta Pro Ultra, Bluetti AC500 + B300S (stackable)

Runs this load ~9.2 h on a full charge.

See current prices on Amazon

This site earns commissions from qualifying purchases made through links to Amazon and other retailers, at no extra cost to you. Wattage figures are typical estimates — actual draw varies by model. Always verify against your appliance's nameplate, and consult a licensed electrician for any panel or hardwired connections.