What size generator do i need for a welder?
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
Water & Pumps
Laundry & Cleaning
Electronics & Office
Medical Devices
Power Tools & Outdoor
- 1
- 1
Lighting
- 4
2. Your sizing
3. Best cross-brand matches
- Bluetti AC200L
- surge 7,200W covers your 5,642W start peak
- 1.5 days of your typical daily use (2,048Wh / 1,348Wh)
- EcoFlow DELTA 3 Max Plus~$1,149
- surge 6,000W covers your 5,642W start peak
- 1.5 days of your typical daily use (2,048Wh / 1,348Wh)
- Jackery Explorer 2000 Plus~$2,599
- surge 6,000W covers your 5,642W start peak
- 1.5 days of your typical daily use (2,043Wh / 1,348Wh)
Static answer (crawlable summary)
Typical device list: Circular Saw (7-1/4 inch)×1, Drill (1/2 inch)×1, Shop Vacuum (6 gallon, 3.5 peak HP)×1, LED Bulb (100W equivalent)×4, Belt Sander (3 inch)×1.
| Continuous load | 3,642 W |
|---|---|
| Startup peak | 5,642 W (driven by 1× Belt Sander (3 inch)) |
| Daily energy use | 1,348 Wh |
| Recommended capacity | 1,690 Wh (25% margin included) |
| Minimum inverter | 4,010 W continuous |
Frequently asked questions
What size generator do i need for a welder?
For a typical setup (circular saw (7-1/4 inch), drill (1/2 inch), shop vacuum (6 gallon, 3.5 peak hp), led bulb (100w equivalent) and belt sander (3 inch)), you need at least 3,642W of continuous power. The single biggest moment is startup: when 1× belt sander (3 inch) kicks on, the momentary draw peaks at 5,642W. For overnight runtime we recommend at least 1,690Wh of battery capacity (your devices use about 1,348Wh per day, plus a 25% margin).
Which power stations can handle this?
Based on published specs, Bluetti AC200L, EcoFlow DELTA 3 Max Plus, Jackery Explorer 2000 Plus all cover the 5,642W startup peak and give you 1.5 days / 1.5 days / 1.5 days of typical daily use. Check the comparison cards above for the full numbers.
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).