Plan seven days, not seven guaranteed nights
A useful hurricane CPAP power plan answers two questions: what will run the machine tonight, and where will tomorrow's energy come from? A battery can cover a planned interval. A solar panel may help replace energy, but neither its wattage label nor a sunny forecast guarantees a week of power.
This guide builds a seven-day planning example around daily energy use, stored reserve and a no-sun alternative. Replace the example numbers with evidence from your own equipment before relying on the plan.
Scope: this is CPAP/APAP power planning, not a life-support backup specification. If you cannot safely tolerate a brief interruption, ask your clinician and equipment provider to arrange an appropriate backup and evacuation plan. Do not change prescribed therapy pressure to extend battery runtime.
One week. A decision each day.
- Before the stormVerify the load, charge the kit and confirm a second power location.
- While access is unsafeWork from verified stored energy. Count solar as zero.
- Every afternoonCompare reserve with the next interval. Recharge safely or move before the allowance is insufficient.
Write down the load before choosing the battery
Record the exact CPAP model, normal hours of use, prescribed settings, humidifier and heated-tube settings, and the documented power cable. Include daytime naps. Ask the equipment provider how to assess normal energy use if you do not already have a reliable measurement.
Worked example · not a machine test
Assume a complete CPAP load averages 12W for eight hours.
- One eight-hour night
- 96Wh12W × 8h
- Seven such nights
- 672Wh96Wh × 7 nights
These are energy requirements delivered to the load, not rated battery capacities. This is not a test result for AirSense, DreamStation or any other named machine. A 30W load over the same seven nights would require 1,680Wh.
The rating on a power adapter describes its capabilities; it is not automatically the machine's average overnight consumption. Likewise, phone charging, lights and other devices must be added to the same energy budget.
Convert stored capacity into a planning allowance
Our illustrative calculation uses an 82% usable-energy factor, then retains 15% of that amount as reserve:
Stored capacity → planning allowanceRated battery Wh × 0.82 × 0.85
These are assumptions, not measured efficiency or a safety certification. Actual losses, temperature, battery condition and changing loads can require a different allowance. Do not count the reserved amount as planned operating time.
An ES960 or ES960 PRO has 297.6Wh rated capacity. That gives about 207Wh of planning energy, or 17.3 hours at this assumed 12W load. It does not establish every user's runtime.
| Interval without recharging | CPAP energy required | Example implication |
|---|---|---|
| One night | 96Wh | Compare against the tested battery allowance. |
| Three nights | 288Wh | More than one 297.6Wh unit's 207Wh planning allowance. |
| Seven nights | 672Wh | Three such allowances total about 622Wh; four total about 830Wh. |
Four separately charged units meet the aggregate arithmetic in this example; that is not a universal recommendation to buy four batteries. Each planned interval must also fit an individual unit's tested runtime. Swap equipment while awake according to its instructions; do not improvise parallel connections. A verified recharge location or earlier relocation may be the more practical plan.
Treat solar as a measured contribution
The ESP110 is rated at 110W. Output changes with cloud, shade, panel angle and temperature, while the receiving battery imposes its own input limits. It cannot be assumed to supply 110W continuously or refill every battery in a fixed number of hours.
Before the season, confirm the documented panel-to-battery voltage range, connector, polarity and cable. Test the actual combination in the intended location, without taking equipment outside in unsafe weather. Measure or document net energy gained over a realistic charging window, not just the highest power reading.
Replacing a 96Wh night requires more than 96Wh from the charging source because charging and output involve losses. Do not compare panel-side energy with CPAP-side consumption as though they were identical. If reliable measurement is unavailable, use the source to recharge to a verified state and confirm what operating interval that state supports.
Make the no-sun plan first
The fallback page
0Wh from solar
Assume solar contributes nothing while the storm passes and outdoor access is unsafe. Agree on a specific alternative before the remaining energy becomes urgent.
- Stored reserve
- Charged equipment with enough verified runtime for the next safe charging or relocation opportunity.
- A second power location
- A confirmed accessible location with suitable power, transport and space for your equipment.
- A documented vehicle charging route
- The correct adapter for the exact battery, used within vehicle instructions. Do not connect a 12V socket to an incompatible battery input.
- An action threshold
- Move to the alternative while enough reserve remains to complete the move and the next planned use period.
Each afternoon, compare the remaining verified allowance with the next night's requirement. Count uncertain future sunshine as zero until usable charging has occurred. If the budget no longer covers the next interval, act on the alternative rather than reduce prescribed therapy or wait for the battery to stop.
Prepare the bedside setup safely
- Use the exact model manual to confirm CPAP compatibility, cable, output voltage, polarity and current requirements. Similar-looking plugs are not proof of compatibility.
- Charge fully and inspect the battery, cable and charger. Keep equipment dry, stable, ventilated and clear of bedding.
- Start with a short test while awake, with the normal power supply immediately available. Follow the CPAP manual if airflow stops; do not remain wearing a non-running mask.
- Only progress to longer verification when the short test and your backup arrangements are satisfactory. Record settings, time and remaining charge.
- Use pass-through only where the exact manual permits it. It does not by itself establish zero-interruption UPS performance; input below consumption can still drain the battery.
The FDA's disaster guidance also advises checking whether the medical device permits battery or generator use and checking settings after power returns. If using a generator, keep it dry and outdoors, at least 20 feet from doors, windows and vents, with a battery-backed CO alarm. See CDC generator guidance.
Keep evacuation and ownership details ready
Ground-based reserve and airline baggage are different plans. ES960 models exceed 160Wh and are not an ordinary passenger carry-on or checked-baggage option under FAA limits. ES270 is 99.9Wh; ES400 AIR is 148Wh and requires the applicable airline-approval route. Protect permitted spare batteries against short circuit, carry them in cabin baggage and check the carrier's restrictions. Permission to carry a battery does not establish permission to use CPAP aboard. Consult FAA PackSafe.
Keep purchase records with the kit. Official-site purchases include five-year coverage; other authorized-platform purchases include three years, with eligible coverage extended to five through registration.
Start your own budget in the runtime planning calculator, then verify the equipment and recharge plan. The objective is an actionable next step on every day of the outage, including days without sun.