How long can the Bluetti AC300 + B300K run a Window AC (8,000 BTU)?
5.5 hours
Formula: (2.8kWh × 0.85 inverter efficiency) ÷ 10.3 kWh/day = 5.5 hours. At continuous 715 W draw (no duty cycle), about 3.3 hours.
What if you add a battery? The AC300 + 2× B300K config jumps to 5.5kWh — roughly 11 hours on a Window AC (8,000 BTU).
Appliance
Window AC (8,000 BTU) · 715 W / 1800 W surge
Battery (base)
2.8kWh · 3kW / 6kW surge
Some links may be affiliate links. GridMatch may earn a commission if you buy through them, at no extra cost to you.
Runtime Quick-Check
Runtime Quick-Check
Pick a battery and an appliance — see days of runtime after the 0.85 inverter derate.
5.5 hours
Formula: (2765 Wh × 0.85) ÷ 10.3 kWh/day = 5.5 hours. Continuous draw ≈ 3.3 hours at full load.
Nearest alternatives
Running more than one device?
Open sizing wizard