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
- 1
Water & Pumps
- 1
Laundry & Cleaning
Electronics & Office
- 1
- 1
Medical Devices
Power Tools & Outdoor
- 1
Lighting
- 10
2. Your sizing
⚠️ Your selection includes 240V equipment (submersible pump / central AC / dryer) — you need a split-phase (120/240V) station or a transfer switch setup. Verify nameplate watts and starting amps before buying; consult a licensed electrician for fixed wiring.
Assumptions: daily hours per device follow DOE / ENERGY STAR duty cycles; capacity adds a 25% margin. Check your appliance nameplates — actual draw varies by model.
3. Best matches from our 6-brand database
No portable station in our database covers this load. This is expandable-system or fixed home-battery territory — check current models from EcoFlow, Anker SOLIX and Bluetti for expansion ceilings, or consider a standby generator.
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.
Estimated from: Energy Star Certified Products · Mfr spec: Goodman GSX14 (SS-GSX14) · Mfr spec class: Netgear KB + measured (ARRIS SB8200) · Energy Star Certified Products (bulbs) · VT Extension table (DOE-derived) · Mfr spec: Zoeller M98 (fm0532) · Mfr spec: Chamberlain Group support · Mfr spec: Reolink RLN8-410 + B800
| Continuous load | 6,085 W |
|---|---|
| Startup peak | 12,895 W (driven by 1× Central AC (2-ton, 24,000 BTU)) |
| Daily energy use | 21,659 Wh |
| Recommended capacity | 27,080 Wh (25% margin included) |
| Minimum inverter | 6,700 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), plus 5 more devices), you need at least 6,085W 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 12,895W. For a full day of runtime we recommend at least 27,080Wh of battery capacity (your devices use about 21,659Wh per day, plus a 25% margin for a full day of use).
Which power stations can handle this?
No single portable station covers this load — this is expandable-system or fixed home-battery territory. Look for a surge rating above 12,895W and at least 27,080Wh.
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). On this page the biggest spike comes from the Central AC (2-ton, 24,000 BTU): a station that only meets the running load will trip or stall when it starts. Data sources: U.S. DOE Energy Saver, ENERGY STAR certified products, manufacturer spec sheets.