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How long will a Bluetti Apex 300 run a CPAP?
How long will a Bluetti Apex 300 power a CPAP device?
About 2 days, 10.8 hours (58.8 h total) — roughly 7.3 nights at 8 hours a night — calculated, not tested. It depends almost entirely on the device's wattage: at the typical 40 W draw (a CPAP without a heated humidifier) the math is 2,765 Wh × 0.85 ÷ 40 W. Heated humidifiers and heated tubes multiply the draw and divide the hours — the table below shows all four preset draws from our CPAP runtime calculator. This page is device-runtime math only: watts in, hours out. It makes no health claims and gives no medical advice.
2 days, 10.8 hours (58.8 h total) ≈ 7.3 nights
At 40 W via AC (0.85 efficiency) from 2,765 Wh. Via a DC converter cable (0.92 factor) the same device runs about 2 days, 15.6 hours (63.6 h total). The device's 40 W draw is far inside this model's 3,840 W continuous rating.
Runtime by device draw (AC, base battery)
| Device draw | Runtime | Nights (8 h) |
|---|---|---|
| 30 W — travel CPAP, no humidifier | 3 days, 6.3 hours (78.3 h total) | 9.8 |
| 40 W — typical CPAP, no heated humidifier | 2 days, 10.8 hours (58.8 h total) | 7.3 |
| 60 W — CPAP with humidifier, heat off/low | 39.2 hours | 4.9 |
| 90 W — CPAP with heated humidifier and heated tube | 26.1 hours | 3.3 |
Bluetti Apex 300 specifications (manufacturer)
| Capacity | 2,765 Wh |
|---|---|
| Maximum capacity with expansion | 19,354 Wh |
| AC output (continuous) | 3,840 W |
| AC output (surge) | 7,680 W |
| Weight | 83.78 lbs |
Source: manufacturer product page · pulled 2026-10-19. Data as of Oct 19, 2026. If a figure is not published in that source, we show a dash rather than estimate it.
How this is calculated: hours = capacity × 0.85 (AC) or × 0.92 (DC) ÷ device watts. The AC factor is Bluetti's published runtime factor (REPORTED); the DC factor and the preset wattages are WattLong assumptions (INFERRED) — the watts printed on your device's power brick are the truth, and the CPAP calculator accepts them directly. Model specs are manufacturer figures. Full methodology: how we calculate.
Scope: this page estimates how long a battery runs a device. It does not say any product is suitable for medical use, does not replace the device manufacturer's guidance, and is not medical advice. If your therapy depends on power, build your backup plan with your clinician and test your exact setup at home before you need it.
More on this model: Bluetti Apex 300 model page · Bluetti Apex 300 refrigerator runtime.
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