How long can the Bluetti FridgePower run a CPAP machine?

5.4 dayswell beyond what you asked for

Formula: (2kWh × 0.85 inverter efficiency) ÷ 0.32 kWh/day = 5.4 days. At continuous 40 W draw (no duty cycle), about 1.8 days.

What if you add a battery? The + BlueCell 200 config jumps to 4kWh — roughly 10.7 days on a CPAP machine.

Appliance

CPAP machine · 40 W / 60 W surge

Battery (base)

2kWh · 1.8kW / 3.6kW surge

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Runtime Quick-Check

Pick a battery and an appliance — see days of runtime after the 0.85 inverter derate.

BatteryApplianceQuantity

5.4 days

Formula: (2016 Wh × 0.85) ÷ 0.32 kWh/day = 5.4 days. Continuous draw ≈ 1.8 days at full load.

Running more than one device?