Quick Answer
Shallow well (jet pump): 3,500-5,000W generator
Deep well (submersible): 5,000-7,500W generator
Our top pick: Champion 9375/7500W Dual Fuel — handles any residential well pump.
240V Warning
Many deep well pumps run on 240V power. Check your pump's electrical requirements. If it's 240V, you'll need a generator with a 240V outlet AND professional installation of a transfer switch.
Our Top Picks
Champion 9375/7500W Dual Fuel
Handles any residential well pump with dual fuel flexibility
DuroMax XP12000EH
For large pumps or whole-house backup with 240V ready
Westinghouse iGen4500DF
Quiet inverter power for shallow well jet pumps
Well Pump Wattage Requirements
Well pumps vary significantly based on type and depth. Deep submersible pumps require much more power than shallow jet pumps.
| Pump Type | HP Rating | Running Watts | Starting Watts | Recommended Generator |
|---|---|---|---|---|
| Shallow Jet Pump | 1/2 HP | 600-800W | 1,800-2,400W | 3,500W |
| Shallow Jet Pump | 1 HP | 1,000-1,200W | 3,000-3,600W | 5,000W |
| Deep Well Submersible | 1/2 HP | 750-1,000W | 2,250-3,000W | 4,500W |
| Deep Well Submersible | 3/4 HP | 1,000-1,500W | 3,000-4,500W | 5,500W |
| Deep Well Submersible | 1 HP | 1,500-2,000W | 4,500-6,000W | 7,500W |
| Deep Well Submersible | 1.5 HP | 2,000-2,500W | 6,000-7,500W | 9,000W+ |
Find your pump's HP: Check the pressure tank or well controller for the HP rating. If you can't find it, assume 1 HP for deep wells and plan for 6,000W starting surge.
Essential Setup for Well Pump Generators
1. Hardwire vs. Extension Cord
For well pumps, professional installation with a transfer switch is strongly recommended. This provides safe 240V power (if needed), protects utility workers, and ensures reliable automatic operation.
2. Consider a Soft Start Device
A soft start device reduces your pump's starting surge by 60-70%. This lets you use a smaller generator or have more headroom for other appliances. Investment: $200-400.
3. Store Water Before Storms
Before predicted storms, fill bathtubs, buckets, and containers. Even with a generator, having stored water provides backup if something goes wrong.
4. Maintain Your Generator
Run your generator monthly for 10-15 minutes under load. Change oil annually. Use fuel stabilizer. When the power goes out at 2 AM in a blizzard, you need it to start on the first pull.
5. Know Your Pressure Tank Capacity
Your pressure tank holds several gallons of water. You don't need to run the generator continuously—just when pressure drops. This extends fuel significantly.