How long will the EcoFlow RIVER 2 Max 500 run a 1/3 HP sump pump?
Can the EcoFlow RIVER 2 Max 500 start a 1/3 HP sump pump?
No. A typical 1/3 HP sump pump draws about 800 W, above the EcoFlow RIVER 2 Max 500’s 500 W continuous AC rating, so the inverter will shut off. Check your own unit’s nameplate, because the figure varies by model, then compare it with the larger stations in the table below.
How long will the EcoFlow RIVER 2 Max 500 run a 1/3 HP sump pump?
Plan on 2.9 hr to 3.5 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 RIVER 2 Max 500’s 499 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 RIVER 2 Max 500?
The EcoFlow DELTA 3 Plus is the next meaningful step up we’ve verified, at 6.0 hr or more on the same 1/3 HP sump pump using the same conservative 0.70 factor, against 2.9 hr here. Only stations that pass both the continuous and surge checks count as upgrades in the table below, so it’s a fair comparison.
| 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.
