Will the EcoFlow DELTA 3 Plus run a sump pump (1/3 hp to 1/2 hp)?
Yes. The DELTA 3 Plus has the output and surge for a 1/3 to 1/2 HP sump pump, but running nonstop its 1024 Wh battery lasts only about 43 minutes to an hour.
Yes: 44 min to 1.0 h
At 800 to 1,200 W running. Formula: 1,024 Wh x 0.85 / load W.
The checks
| Check | Station | Sump pump (1/3 HP to 1/2 HP) | Result |
|---|---|---|---|
| Running watts | 1,800 W rated[1] | 800 to 1,200 W[2][3][4][5][6] | OK |
| Starting surge | 3,600 W[1] | 1,300 to 3,200 W[2][3] | OK |
| Energy | 1,024 Wh[1], about 870 Wh usable | 1,200 W at the high end[2][3][4][5][6] | 44 min to 1.0 h |
Wattage figures we used
| Figure | Watts | Notes | Source |
|---|---|---|---|
| Running | 800 W | 1/3 HP sump pump | [2] |
| Running | 1,050 W | 1/2 HP sump pump | [3] |
| Running | 1,164 W | Zoeller M53, 3/10 HP. Derived: 9.7 A x 120 V | [4] |
| Running | 1,128 W | Zoeller M98, 1/2 HP. Derived: 9.4 A x 120 V | [5] |
| Running | 1,140 W | Wayne CDU790, 1/3 HP. Derived: 9.5 A x 120 V | [6] |
| Running | 1,200 W | Wayne CDU800, 1/2 HP. Derived: 10 A x 120 V | [6] |
| Starting | 1,300 W | 1/3 HP sump pump, starting watts | [2] |
| Starting | 3,200 W | 1/2 HP sump pump. Derived: 1050 running + 2150 additional starting watts in Generac's chart | [3] |
A sump pump is a heavy load for a portable station. The figures we found put a 1/3 to 1/2 HP pump at 800 to 1200 W while it runs, and 1300 to 3200 W for the moment the motor starts.
The DELTA 3 Plus is rated for 1800 W continuous and 3600 W surge, so it covers the running draw and the highest starting figure in our sources. That matters because the pump restarts every time the float rises, and a station that trips on the start is no help in a storm.
Runtime is the catch. Running without a break, the pump empties the battery in under an hour and a half at the low end of the range and less at the high end. Real pumps cycle, so the battery lasts longer in a normal rain. The sump pump storm page works out the runtime for a pump that runs a few minutes an hour up to half the time.
For long storms, plan on recharging, an extra battery, or a backup pump made for the job. Check your pump's label for its amps and enter its watts in the calculator.
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Questions
How long will the DELTA 3 Plus run a sump pump?
Running nonstop, about 43 minutes at 1200 W to about an hour at 800 W. A pump that only runs part of each hour lasts much longer.
Can the DELTA 3 Plus handle the pump's starting surge?
Yes. The highest starting figure in our sources is 3200 W, under the 3600 W surge EcoFlow lists.
Runtime calculator
Runtime (hours) = battery Wh x inverter efficiency / load W
Efficiency is the share of battery energy that reaches the outlet. Where the maker does not publish it we use 0.85. Average W is for loads that cycle on and off, like a fridge; leave it blank to use running watts. Starting surge assumes one motor starts at a time. How the estimates work.
More: everything the EcoFlow DELTA 3 Plus runs · appliance watts
Sources
- EcoFlow DELTA 3 Plus product page and specs (us.ecoflow.com), read Oct 22, 2026
- Champion Power Equipment Wattage Reference Chart (help.championpowerequipment.com), read Oct 22, 2026
- Generac GP Series portable generator brochure, wattage reference chart (PDF), read Oct 22, 2026
- Zoeller Technical Data Sheet FM2778, Mighty-Mate Series Models 53, 57, 55, 59, read Oct 22, 2026
- Zoeller Technical Data Sheet FM2779, Flow-Mate Series Model 98, read Oct 22, 2026
- WAYNE sump pump owner's manual specifications, horsepower and amp ratings (CDU790, CDU800 and others), read Oct 22, 2026