How long can the Tesla Powerwall 3 run a Window AC (8,000 BTU)?
1.1 days
Formula: (13.5kWh × 0.85 inverter efficiency) ÷ 10.3 kWh/day = 1.1 days. At continuous 715 W draw (no duty cycle), about 16 hours.
Appliance
Window AC (8,000 BTU) · 715 W / 1800 W surge
Battery (base)
13.5kWh · 11.5kW / 11.5kW surge
Runtime Quick-Check
Runtime Quick-Check
Pick a battery and an appliance — see days of runtime after the 0.85 inverter derate.
1.1 days
Formula: (13500 Wh × 0.85) ÷ 10.3 kWh/day = 1.1 days. Continuous draw ≈ 16 hours at full load.
Nearest alternatives
Running more than one device?
Open sizing wizard