How long can the EcoFlow DELTA Pro 3 run a Central AC (3 ton)?
2 hours
Formula: (4.1kWh × 0.85 inverter efficiency) ÷ 42 kWh/day = 2 hours. At continuous 3500 W draw (no duty cycle), about 1 hour.
What if you add a battery? The + Extra Battery config jumps to 8.2kWh — roughly 4 hours on a Central AC (3 ton).
Appliance
Central AC (3 ton) · 3500 W / 8000 W surge · 240V
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.
2 hours
Formula: (4096 Wh × 0.85) ÷ 42 kWh/day = 2 hours. Continuous draw ≈ 1 hour at full load.
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