How long can the EcoFlow DELTA Pro Ultra run a Window AC (8,000 BTU)?
12.2 hours
Formula: (6.1kWh × 0.85 inverter efficiency) ÷ 10.3 kWh/day = 12.2 hours. At continuous 715 W draw (no duty cycle), about 7.3 hours.
What if you add a battery? The + Extra Battery config jumps to 12.3kWh — roughly 1 day on a Window AC (8,000 BTU).
Appliance
Window AC (8,000 BTU) · 715 W / 1800 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.
12.2 hours
Formula: (6144 Wh × 0.85) ÷ 10.3 kWh/day = 12.2 hours. Continuous draw ≈ 7.3 hours at full load.
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