How long will the EcoFlow DELTA Pro 3 run a 1/3 HP sump pump?
Can the EcoFlow DELTA Pro 3 start a 1/3 HP sump pump?
Yes. A typical 1/3 HP sump pump draws about 800 W running and up to 2,400 W starting, both inside the EcoFlow DELTA Pro 3’s published 4,000 W continuous and 8,000 W surge ratings. Your own unit’s nameplate can differ, so check it before relying on this.
How long will the EcoFlow DELTA Pro 3 run a 1/3 HP sump pump?
Plan on 24 hr to 29 hr for a typical 1/3 HP sump pump at a 15% duty cycle, about 120 W on average. That range applies 0.70 and 0.85 usable-capacity factors to the EcoFlow DELTA Pro 3’s 4,096 Wh, because inverter heat and battery management overhead consume the rest. Actual use depends on your own appliance and conditions.
Which station runs a 1/3 HP sump pump longer than the EcoFlow DELTA Pro 3?
None of the stations we’ve verified adds at least 25% more runtime than the EcoFlow DELTA Pro 3 here, at 24 hr or more, while also passing both checks. To go further, consider adding an expansion battery or solar input. The comparison below shows how every verified station handles the same 1/3 HP sump pump.
| Station | Capacity | Cautious | Best case | Continuous | Surge |
|---|---|---|---|---|---|
| EcoFlow RIVER 2 Max 500 | 499 Wh | 2.9 hr | 3.5 hr | Fail | Fail |
| EcoFlow DELTA 3 Plus | 1,024 Wh | 6.0 hr | 7.3 hr | Pass | Pass |
| Jackery Explorer 1000 v2 | 1,070 Wh | 6.2 hr | 7.6 hr | Pass | Pass |
| BLUETTI AC180 | 1,152 Wh | 6.7 hr | 8.2 hr | Pass | Pass |
| Jackery Explorer 2000 v2 | 2,042 Wh | 12 hr | 14 hr | Pass | Pass |
| BLUETTI Elite 200 V2 | 2,073.6 Wh | 12 hr | 15 hr | Pass | Unverified |
| EcoFlow DELTA Pro 3 | 4,096 Wh | 24 hr | 29 hr | Pass | Pass |
What load does this 1/3 HP sump pump estimate assume?
These figures are typical values, not measurements of your unit. We assume 800 W running, 2,400 W starting and a 15% duty cycle for a 1/3 HP sump pump. Models vary widely, so enter your nameplate figure in the calculator above for a number that fits your own appliance and how you use it.
Induction motors can start at about three times running power. The duty cycle depends entirely on how much water you have.
