What size generator for a 3000 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
Heating, Cooling & Fans
- 1
Water & Pumps
- 1
Laundry & Cleaning
Electronics & Office
Medical Devices
Power Tools & Outdoor
Lighting
- 8
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, Window AC (10,000 BTU)×1, Router + Modem×1, LED Bulb (60W equivalent)×8, Microwave Oven×1, Sump Pump (1/3 HP)×1, Furnace Fan (1/2 HP blower)×1, TV (55-inch LED)×1.
| Continuous load | 4,137 W |
|---|---|
| Startup peak | 6,337 W (driven by 1× Sump Pump (1/3 HP)) |
| Daily energy use | 13,525 Wh |
| Recommended capacity | 16,910 Wh (25% margin included) |
| Minimum inverter | 4,560 W continuous |
Frequently asked questions
What size generator for a 3000 sq ft home?
For a typical setup (refrigerator (side-by-side, ~24 cu ft), freezer (upright, ~15 cu ft), window ac (10,000 btu), router + modem and led bulb (60w equivalent)), you need at least 4,137W of continuous power. The single biggest moment is startup: when 1× sump pump (1/3 hp) kicks on, the momentary draw peaks at 6,337W. For overnight runtime we recommend at least 16,910Wh of battery capacity (your devices use about 13,525Wh per day, plus a 25% margin).
Which power stations can handle this?
Look for a station whose surge rating covers 6,337W and whose capacity is at least 16,910Wh.
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).