How long can the EcoFlow DELTA Pro 3 run a Sump pump?
1.2 days
Formula: (4.1kWh × 0.85 inverter efficiency) ÷ 2.88 kWh/day = 1.2 days. At continuous 800 W draw (no duty cycle), about 4.4 hours.
What if you add a battery? The + Extra Battery config jumps to 8.2kWh — roughly 2.4 days on a Sump pump.
Appliance
Sump pump · 800 W / 2000 W surge
Battery (base)
4.1kWh · 4kW / 8kW surge
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Runtime Quick-Check
Runtime Quick-Check
Pick a battery and an appliance — see days of runtime after the 0.85 inverter derate.
1.2 days
Formula: (4096 Wh × 0.85) ÷ 2.88 kWh/day = 1.2 days. Continuous draw ≈ 4.4 hours at full load.
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