What size generator do i need for central ac?
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
- 1
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: Central AC (2-ton, 24,000 BTU)×1, Furnace Fan (1/2 HP blower)×1.
| Continuous load | 2,680 W |
|---|---|
| Startup peak | 9,490 W (driven by 1× Central AC (2-ton, 24,000 BTU)) |
| Daily energy use | 18,440 Wh |
| Recommended capacity | 23,050 Wh (25% margin included) |
| Minimum inverter | 2,950 W continuous |
Frequently asked questions
What size generator do i need for central ac?
For a typical setup (central ac (2-ton, 24,000 btu) and furnace fan (1/2 hp blower)), you need at least 2,680W of continuous power. The single biggest moment is startup: when 1× central ac (2-ton, 24,000 btu) kicks on, the momentary draw peaks at 9,490W. For overnight runtime we recommend at least 23,050Wh of battery capacity (your devices use about 18,440Wh per day, plus a 25% margin).
Which power stations can handle this?
Look for a station whose surge rating covers 9,490W and whose capacity is at least 23,050Wh.
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).