How Many Watts Does a Sump Pump (1/3 HP Submersible) Use?
On average, a Sump Pump (1/3 HP Submersible) consumes 800 running watts during normal continuous operation. However, when the motor or compressor starts, it requires an inrush surge of 2,100 starting watts.
⚡ Electrical Specifications Quick Card
Understanding Sump Pump (1/3 HP Submersible) Power Draw & Surge Watts
A 1/3 HP submersible sump pump uses an induction motor that experiences a significant inrush current (locked rotor amps) when first energized, drawing 2.5 to 3 times its normal running wattage for a split second as the rotor transitions from a standstill to full operational speed. This inductive surge requires an adequate surge capacity from your power source to prevent voltage sag or tripping the inverter.
While a 1/3 HP sump pump only requires about 800 running watts, you need a generator rated for at least 2,000 to 2,500 starting watts to handle the motor's initial inrush current safely. Ensure the generator provides clean power (low Total Harmonic Distortion, <5%) to protect the pump's switch and motor windings, and connect it via a dedicated extension cord or manual transfer switch rather than plugging it into unrated consumer backup strips.
Sump Pump (1/3 HP Submersible) Power & Outage Calculator
Best Generators & Power Stations to Run a Sump Pump (1/3 HP Submersible)
Selected specifically to comfortably handle the 2100W surge requirement plus a 20% safety buffer.
Westinghouse WGen4500DFc Dual Fuel Inverter
Provides sufficient peak surge (4500W) to start the 2100W load safely.
Champion 4650-Watt Dual Fuel Inverter Generator
Clean sine wave power with high surge headroom (4650W) for sensitive electronics.
Jackery Explorer 1000 v2 Portable Power Station
Silent indoor power station offering 1070Wh capacity with zero exhaust or gas maintenance.
Sump Pump (1/3 HP Submersible) Electricity Cost in Key US States
Compare the monthly and annual cost of running this appliance across major states based on official U.S. EIA residential electricity rates.
| State | Average Rate (¢/kWh) | Daily Cost | Monthly Cost | Annual Cost | Detailed Breakdown |
|---|---|---|---|---|---|
| California (CA) | 31.8¢ | $0.13 | $3.87 | $46.49 | View CA Report → |
| Florida (FL) | 15.5¢ | $0.06 | $1.88 | $22.60 | View FL Report → |
| Hawaii (HI) | 43.3¢ | $0.17 | $5.26 | $63.14 | View HI Report → |
| Illinois (IL) | 16.4¢ | $0.07 | $2.00 | $24.02 | View IL Report → |
| New York (NY) | 23.6¢ | $0.09 | $2.88 | $34.53 | View NY Report → |
| North Carolina (NC) | 13.8¢ | $0.06 | $1.68 | $20.21 | View NC Report → |
| Ohio (OH) | 15.8¢ | $0.06 | $1.92 | $23.10 | View OH Report → |
| Pennsylvania (PA) | 18.1¢ | $0.07 | $2.20 | $26.46 | View PA Report → |
| Texas (TX) | 14.6¢ | $0.06 | $1.78 | $21.39 | View TX Report → |
| Washington (WA) | 11.5¢ | $0.05 | $1.39 | $16.72 | View WA Report → |
Frequently Asked Questions
How many watts does Sump Pump (1/3 HP Submersible) use?
A typical 1/3 HP submersible sump pump consumes about 800 running watts during continuous pumping, but requires approximately 2,100 watts of surge power for a brief moment when the motor first starts up.
What size generator do I need for Sump Pump (1/3 HP Submersible)?
You will need a generator with at least 2,000 to 2,500 starting watts capacity to reliably handle the motor's inrush surge. A standard 2,000W inverter generator can run it alone, but a 3,000W to 3,500W model is recommended if you plan to run other household essentials simultaneously.
Can a portable power station or battery run Sump Pump (1/3 HP Submersible)?
Yes, a portable power station with at least a 1,500Wh capacity and a 2,000W+ continuous inverter can successfully run a 1/3 HP sump pump during a power outage. Because sump pumps cycle on and off intermittently based on water table levels, a 1,500Wh battery can typically provide several hours to a full day of backup operation depending on heavy rainfall frequency.