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EcoFlow RIVER 3 CPAP Runtime Estimate

A short CPAP runtime check for the compact RIVER 3 with conservative reserve and manufacturer guidance visible. The estimate uses the same runtime engine as the main calculator and keeps source confidence visible.

EcoFlow RIVER 3 portable power station

Within the tracked power limits; compatibility still needs checking

4h 26m

Estimated runtime: CPAP without heated humidifier. Within the tracked power limits; compatibility still needs checking

4h 0m

Planning default · ≤ 4h 26m

AC inverter

Continuous output rating (W): 300 W

CPAP without heated humidifier: 40 W · Duty cycle (%): 100% · Efficiency (%): 85% · Reserve kept unused (%): 15%. Runtime is conditional on successful startup, compatible voltage/connectors and sufficient output. Verify the actual device setup before relying on these hours.

Runtime range

These are calculated sensitivity cases, not a statistical confidence interval. Conservative uses lower efficiency and battery health, more reserve/temperature loss and higher load; optimistic changes these assumptions in the opposite direction.

Conservative2h 45m
Estimated4h 26m
Optimistic5h 31m

Assumptions

Use this as a planning estimate, not a guaranteed runtime claim.

  • Battery capacity (Wh): 245 Wh
  • Device wattage (W): 40 W
  • Duty cycle (%): 100%
  • Output path: AC inverter
  • Efficiency (%): 85%
  • Reserve kept unused (%): 15%
  • Battery health (%): 100%
  • Cold weather loss (%): 0%
  • Device startup surge (W): Not required
  • Fixed station overhead unknown; not included
  • This is an estimate. Real runtime changes with load, temperature, battery age, AC/DC output, and device behavior. Runtime is conditional on successful startup, compatible voltage/connectors and sufficient output. Verify the actual device setup before relying on these hours.
  • Within the tracked power limits; compatibility still needs checking
  • CPAP values are editable planning assumptions, not a manufacturer-approved battery prescription. Check the exact device, pressure, humidifier, heated tube, approved converter and output path with the manufacturer and care provider. Adapter wattage is not measured therapy consumption. Do not change prescribed therapy to meet an estimate.

Sources

Unverified or missing specifications remain visible. The confidence label describes the station record, not a tested runtime or approval for emergency use.

Confidence

Models: Estimated. Device scenario: Estimated. Last verified: 2026-08-21. Unverified or missing specifications remain visible. The confidence label describes the station record, not a tested runtime or approval for emergency use.

Runtime sensitivity

These computed checks show how reserve, battery health, and temperature assumptions move the estimate before you trust one number.

Current assumptions

4h 26m

Reserve: 15% · Battery health: 100% · Temperature loss: 0%

  • Usable energy: 177 Wh
  • Average load: 40 W

Higher reserve

3h 54m

Reserve: 25% · Battery health: 100% · Temperature loss: 0%

  • Usable energy: 156 Wh
  • Average load: 40 W

Cold or aged battery

3h 23m

Reserve: 15% · Battery health: 90% · Temperature loss: 15%

  • Usable energy: 135 Wh
  • Average load: 40 W

Nearby station estimates

Compare this result with nearby source-linked model pages for the same device scenario.

BLUETTI EB3A

4h 50m · 40 W · Reserve: 15%. Within the tracked power limits; compatibility still needs checking

Open estimate

BLUETTI AC2A

3h 42m · 40 W · Reserve: 15%. Within the tracked power limits; compatibility still needs checking

Open estimate

Anker SOLIX C300

5h 12m · 40 W · Reserve: 15%. Within the tracked power limits; compatibility still needs checking

Open estimate

Next step

Open the parent records before using this estimate for a purchase or backup plan.

Sources

These are calculated sensitivity cases, not a statistical confidence interval. Conservative uses lower efficiency and battery health, more reserve/temperature loss and higher load; optimistic changes these assumptions in the opposite direction.

Assumptions to check

FAQ

Use this as a planning estimate, not a guaranteed runtime claim.

EcoFlow RIVER 3: Estimated runtime?

4h 26m. Within the tracked power limits; compatibility still needs checking. CPAP without heated humidifier: 40 W · Duty cycle (%): 100% · Efficiency (%): 85% · Reserve kept unused (%): 15%. Runtime is conditional on successful startup, compatible voltage/connectors and sufficient output. Verify the actual device setup before relying on these hours.

Assumptions?

This is an estimate. Real runtime changes with load, temperature, battery age, AC/DC output, and device behavior. Runtime is conditional on successful startup, compatible voltage/connectors and sufficient output. Verify the actual device setup before relying on these hours. These are calculated sensitivity cases, not a statistical confidence interval. Conservative uses lower efficiency and battery health, more reserve/temperature loss and higher load; optimistic changes these assumptions in the opposite direction. CPAP values are editable planning assumptions, not a manufacturer-approved battery prescription. Check the exact device, pressure, humidifier, heated tube, approved converter and output path with the manufacturer and care provider. Adapter wattage is not measured therapy consumption. Do not change prescribed therapy to meet an estimate.