How long can the EcoFlow DELTA Pro Ultra run a Space heater?
7 hours
Formula: (6.1kWh × 0.85 inverter efficiency) ÷ 18 kWh/day = 7 hours. 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 13.9 hours on a Space heater.
Appliance
Space heater · 1500 W / 1500 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.
7 hours
Formula: (6144 Wh × 0.85) ÷ 18 kWh/day = 7 hours. Continuous draw ≈ 3.5 hours at full load.
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