What size generator for window air conditioner?
Check, uncheck or adjust the typical device list below — watts, startup surge and battery size update instantly. Numbers come from U.S. DOE, ENERGY STAR and manufacturer spec sheets, not marketing copy.
1. Check what you need to power
Refrigeration & Freezers
Kitchen
Heating, Cooling & Fans
Water & Pumps
Laundry & Cleaning
Electronics & Office
Medical Devices
Power Tools & Outdoor
Lighting
2. Your sizing
3. Best cross-brand matches
No single portable power station covers this load — look at expandable systems (e.g., EcoFlow DELTA Pro 3 + extra battery, Anker SOLIX F3800 expansion packs) or a fixed home battery instead.
Static answer (crawlable summary)
Typical device list: Window AC (10,000 BTU)×1.
| Continuous load | 700 W |
|---|---|
| Startup peak | 2,100 W (driven by 1× Window AC (10,000 BTU)) |
| Daily energy use | 5,600 Wh |
| Recommended capacity | 7,000 Wh (25% margin included) |
| Minimum inverter | 780 W continuous |
Frequently asked questions
What size generator for window air conditioner?
For a typical setup (window ac (10,000 btu)), you need at least 700W of continuous power. The single biggest moment is startup: when 1× window ac (10,000 btu) kicks on, the momentary draw peaks at 2,100W. For overnight runtime we recommend at least 7,000Wh of battery capacity (your devices use about 5,600Wh per day, plus a 25% margin).
Which power stations can handle this?
Look for a station whose surge rating covers 2,100W and whose capacity is at least 7,000Wh.
Why is the startup surge higher than the running watts?
Motor-driven devices (fridge compressors, well pumps, air conditioners) draw 2-5× their running power for a split second at startup — measured as locked-rotor amps (LRA). A generator that only meets the running load will trip or stall when the biggest motor starts. Our data sources: U.S. DOE Energy Saver, ENERGY STAR certified product database, and manufacturer spec sheets (Franklin Electric, Goodman, Zoeller).