What size generator for a 4000 sq ft home?
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
- 1
- 1
Kitchen
- 1
- 1
Heating, Cooling & Fans
Water & Pumps
Laundry & Cleaning
Electronics & Office
Medical Devices
Power Tools & Outdoor
Lighting
- 10
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: Refrigerator (side-by-side, ~24 cu ft)×1, Freezer (upright, ~15 cu ft)×1, Central AC (2-ton, 24,000 BTU)×1, Router + Modem×1, LED Bulb (60W equivalent)×10, Dishwasher (with heated dry)×1, Microwave Oven×1, Sump Pump (1/2 HP, high-capacity)×1, Garage Door Opener (1/2 HP, belt/chain)×1, Security Camera System (4x PoE cameras + NVR)×1.
| Continuous load | 6,125 W |
|---|---|
| Startup peak | 12,935 W (driven by 1× Central AC (2-ton, 24,000 BTU)) |
| Daily energy use | 21,859 Wh |
| Recommended capacity | 27,330 Wh (25% margin included) |
| Minimum inverter | 6,740 W continuous |
Frequently asked questions
What size generator for a 4000 sq ft home?
For a typical setup (refrigerator (side-by-side, ~24 cu ft), freezer (upright, ~15 cu ft), central ac (2-ton, 24,000 btu), router + modem and led bulb (60w equivalent)), you need at least 6,125W 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 12,935W. For overnight runtime we recommend at least 27,330Wh of battery capacity (your devices use about 21,859Wh per day, plus a 25% margin).
Which power stations can handle this?
Look for a station whose surge rating covers 12,935W and whose capacity is at least 27,330Wh.
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).