What size generator to run a space heater?
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
- 1
Water & Pumps
Laundry & Cleaning
Electronics & Office
Medical Devices
Power Tools & Outdoor
Lighting
- 2
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: Portable Space Heater×1, Electric Blanket (double)×1, LED Bulb (60W equivalent)×2.
| Continuous load | 1,626 W |
|---|---|
| Startup peak | 1,626 W (driven by 1× Portable Space Heater) |
| Daily energy use | 6,930 Wh |
| Recommended capacity | 8,670 Wh (25% margin included) |
| Minimum inverter | 1,790 W continuous |
Frequently asked questions
What size generator to run a space heater?
For a typical setup (portable space heater, electric blanket (double) and led bulb (60w equivalent)), you need at least 1,626W of continuous power. The single biggest moment is startup: when 1× portable space heater kicks on, the momentary draw peaks at 1,626W. For overnight runtime we recommend at least 8,670Wh of battery capacity (your devices use about 6,930Wh per day, plus a 25% margin).
Which power stations can handle this?
Look for a station whose surge rating covers 1,626W and whose capacity is at least 8,670Wh.
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).