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Runtime calculation

How Long Will an Anker SOLIX C300 Run a CPAP Machine

This estimate separates electrical compatibility from battery endurance. Published specifications control where they exist, and every planning default is labelled where the manufacturer leaves a gap.

Research by the Power Station Station Editorial Team

Estimated runtime
6.5 hours
From 288Wh rated capacity against a 35W average load.
Continuous output
300 W
What the inverter can sustain. Output decides whether the appliance runs at all.
Published peak
Not published
Anker SOLIX does not publish a general surge rating for this model, so motor starts need model-level verification.

Our answer

On our planning profile the Anker SOLIX C300 runs a CPAP machine for about 6.5 hours, or 5.2 hours if you keep a reserve back.

The checks behind this answer

Stored energy is the final check, not the first. Voltage, continuous output, and startup demand must clear before runtime means anything. Missing published evidence stays marked unverified instead of being treated as a pass.

Electrical checks applied to this station and appliance pairing
CheckResultWhy
VoltageClearsA CPAP machine runs on 120V and the Anker SOLIX C300 supplies 120V AC.
Continuous outputClearsA 35W running load sits inside the 300W continuous rating, leaving about 757% headroom.
Startup demandClearsThe 60W start is covered by continuous output alone, so no surge rating is needed.
Inverter self-consumptionUnverifiedThis is a long, low-power load, so the inverter's own draw materially changes the answer. That figure is not published for this station.

How the number is built

A battery holds back some of its rated capacity, and converting to household AC costs more on top. Of the 288Wh rated here, roughly 228Wh reaches the outlet under a conservative planning model.

That energy meets an average load of 35W, which applies a 100% duty cycle to a 35W running draw. Holding back a 20% reserve for battery age, cold, and a longer outage leaves 5.2 hours. These are calculations, not measurements from a test.

What we could not verify

These gaps are in the published evidence, not in the arithmetic. Each one is a reason to check before you depend on this pairing.

  • Inverter self-consumption is not published, and it matters more than the appliance load on a run this long.

Before you rely on this

These limits decide whether this appliance belongs on a portable battery at all.

  • This page is planning information, not medical advice, and nothing here is a guarantee of therapy continuity.
  • Use only the power supply or DC converter that your device manufacturer approves for your model.
  • If an interruption in therapy would be dangerous for you, discuss a backup plan with your clinician or equipment supplier rather than relying on a calculation.

Replace our assumptions with your own

Heated humidification and heated tubing can multiply the energy a CPAP uses overnight. Turning both off is the single largest change you can make to backup runtime, and it is a decision to make with your clinician, not a spreadsheet.

Check your device manual for its rated consumption at your prescribed pressure, then meter a full night with your actual humidifier setting.

Continue through this cluster

Use the next page that answers your unresolved constraint

Everything a Anker SOLIX C300 can runCompare this answer against the other loads the same station covers.CPAP machine power requirementsWork through the load itself before choosing hardware for it.Anker SOLIX C300 specifications and sourcesSee where every number on this page came from.All Anker SOLIX recordsCompare the rest of the range.Runtime calculatorReplace our planning defaults with your own measurements.

Evidence used on this page

Important fields are tied to a specific source. Manufacturer claims, government guidance, calculations, and planning assumptions remain separate.

  1. Capacity, output, SurgePad rating, ports, weight, warranty, and UPS read from the rendered comparison table. The solar voltage window comes from the same page’s published FAQ.

    official product page

  2. Device-specific battery tables, inverter guidance, and the energy difference humidification makes.

    official support

  3. Defines the capacity, efficiency, reserve, duty-cycle, voltage, continuous-output, and startup checks applied across the site. Planning defaults are visible on every page that uses them.

    planning assumption

  4. Solar input connector and voltage window from FAQ Q2, per-port USB behaviour from FAQ Q3, AC outlet rating from FAQ Q4, car outlet and port count from the comparison strip.

    official product page

  5. Anker's own comparison tool. Source for AC outlet counts, per-port USB wattage, car auxiliary rating, AC input and the MPPT current limit. Its receptacle type labels are not used: it prints "NEMA 6-20" for outlets it annotates as 120V.

    official product page