How long can the EcoFlow DELTA Pro Ultra run a Well pump (1 hp)?

1.5 days

Formula: (6.1kWh × 0.85 inverter efficiency) ÷ 3.6 kWh/day = 1.5 days. At continuous 1500 W draw (no duty cycle), about 3.5 hours.

What if you add a battery? The + Extra Battery config jumps to 12.3kWh — roughly 2.9 days on a Well pump (1 hp).

Appliance

Well pump (1 hp) · 1500 W / 4500 W surge · 240V

Battery (base)

6.1kWh · 7.2kW / 10.8kW surge

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Runtime Quick-Check

Pick a battery and an appliance — see days of runtime after the 0.85 inverter derate.

BatteryApplianceQuantity

1.5 days

Formula: (6144 Wh × 0.85) ÷ 3.6 kWh/day = 1.5 days. Continuous draw ≈ 3.5 hours at full load.

Running more than one device?