How long can the EcoFlow DELTA Pro Ultra run a Sump pump?
1.8 days
Formula: (6.1kWh × 0.85 inverter efficiency) ÷ 2.88 kWh/day = 1.8 days. At continuous 800 W draw (no duty cycle), about 6.5 hours.
What if you add a battery? The + Extra Battery config jumps to 12.3kWh — roughly 3.6 days on a Sump pump.
Appliance
Sump pump · 800 W / 2000 W surge
Battery (base)
6.1kWh · 7.2kW / 10.8kW 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.
1.8 days
Formula: (6144 Wh × 0.85) ÷ 2.88 kWh/day = 1.8 days. Continuous draw ≈ 6.5 hours at full load.
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