The Best Power Stations for a CPAP (2026) — Nights Per Charge, Calculated

◆ Short answer

The Anker SOLIX C1000 Gen 2 is the sensible CPAP unit: 890 measured usable watt-hours gives about 25 hours of a 35 W machine — three nights with the humidifier off, or about a night and a half with it on.[1] For a single night in a small bag, the Bluetti AC70 is enough. The Anker SOLIX C300 is not — it delivers under seven hours, which is less than one night.

Product buttons go to Amazon listings. We are not in any affiliate programme, so we earn nothing whether you buy or not. Full policy

⚠ Talk

This page is arithmetic on published measurements, not medical or equipment advice. CPAP power draw varies significantly with pressure setting, mask leak, altitude compensation and heated tubing. Check your own machine's rated draw, and if the therapy is medically necessary during outages, discuss backup with your supplier rather than relying on a calculation from a website.

What a CPAP actually draws

The figure that matters is not the machine's peak rating but its average overnight draw, and it changes enormously with one setting.

~35 W Humidifier off

~70 W Humidifier on

~20 W Heated tube adds

The humidifier is a heating element. Turning it on roughly doubles consumption and can more than halve your nights per charge. Every figure below is given both ways for that reason.

Nights per charge

CPAP runtime by power station
Unit	Measured usable	Humidifier off	Humidifier on	Nights (dry)
Jackery Explorer 2000 v2 Most nights	1,710 Wh	48 h 51	24 h 26	6.1
Jackery Explorer 1000 v2	910 Wh	26 h 00	13 h 00	3.3
Anker SOLIX C1000 Gen 2 Winner	890 Wh	25 h 26	12 h 43	3.2
Bluetti Elite 100 V2	890 Wh	25 h 26	12 h 43	3.2
EcoFlow Delta 3	870 Wh	24 h 51	12 h 26	3.1
Bluetti AC70	690 Wh	19 h 43	9 h 51	2.5
EcoFlow River 2 Pro	620 Wh	17 h 43	8 h 51	2.2
Anker SOLIX C300	230 Wh	6 h 34	3 h 17	0.8

Swipe for 1 more column →

Anker SOLIX C1000 Gen 2Winner

Measured usable: 890 Wh
Humidifier off: 25 h 26
Humidifier on: 12 h 43
Nights (dry): 3.2

Jackery Explorer 2000 v2Most nights

Measured usable: 1,710 Wh
Humidifier off: 48 h 51
Humidifier on: 24 h 26
Nights (dry): 6.1

Jackery Explorer 1000 v2

Measured usable: 910 Wh
Humidifier off: 26 h 00
Humidifier on: 13 h 00
Nights (dry): 3.3

Bluetti Elite 100 V2

Measured usable: 890 Wh
Humidifier off: 25 h 26
Humidifier on: 12 h 43
Nights (dry): 3.2

EcoFlow Delta 3

Measured usable: 870 Wh
Humidifier off: 24 h 51
Humidifier on: 12 h 26
Nights (dry): 3.1

Bluetti AC70

Measured usable: 690 Wh
Humidifier off: 19 h 43
Humidifier on: 9 h 51
Nights (dry): 2.5

EcoFlow River 2 Pro

Measured usable: 620 Wh
Humidifier off: 17 h 43
Humidifier on: 8 h 51
Nights (dry): 2.2

Anker SOLIX C300

Measured usable: 230 Wh
Humidifier off: 6 h 34
Humidifier on: 3 h 17
Nights (dry): 0.8

Nights assume eight hours. All figures are calculated from independently measured usable capacity at a 35 W or 70 W draw — assumptions here. Your machine will differ.

◆ The

At 230 measured usable watt-hours, the Anker SOLIX C300 runs a 35 W CPAP for about six and a half hours.[2] That is short of a full night with the humidifier off, and about three hours with it on. It is marketed as a small travel unit and it is a good one — but not for this.

1 · Anker SOLIX C1000 Gen 2 — three nights, sensible money

#1 Best for CPAP1 kWh class

PRODUCT SHOT
1:1

8.7 Weighted / 10

Anker SOLIX C1000 Gen 2

Capacity1024 Wh rated

Usable890 Wh · 86.9%

AC output2000 W / 3000 surge

Solar in600 W max

ChemistryLiFePO4 · 4000 cyc

Weight25.2 lb

Fridge runtime · calculated 19 h 47

Solar recharge · 2×100 W 6 h 50

Calculated, not observed: 890 Wh measured usable ÷ 45 W average draw; solar from 150 W effective input (2×100 W derated to 75%). Assumptions.

$499.99 List price · checked 5 Sep 2026 $0.56 per
usable Wh

Anker SOLIX C1000 Gen 2 →Check price on Amazon Street prices move constantly — we don't quote them.

＋ Strengths

87% of rated capacity delivered — joint best in the 1 kWh class[1]
2,000 W continuous, the highest output in its class[3]
Recharged in a measured 56 minutes[1]
Cheapest per usable watt-hour of the measured 1 kWh units

− Limits

No expansion battery — what you buy is what you get[3]
600 W solar ceiling is mid-pack for the class[3]
Anker publishes no full-load noise figure, only a 20 dB idle claim[3]
Anker lists no MSRP, so the widely quoted $799 "list" is third-party only

Three nights dry, or a night and a half with the humidifier running — enough margin that a two-day outage is not a crisis.[1] It recharges in a measured 56 minutes, so a brief return of mains power refills it completely.[1]

At $499.99 it is also the cheapest way to get to three nights.[3]

2 · Jackery Explorer 2000 v2 — for a week of outage

#2 Six nights2 kWh class

PRODUCT SHOT
1:1

7.8 Weighted / 10

Jackery Explorer 2000 v2

Capacity2042 Wh rated

Usable1710 Wh · 83.7%

AC output2200 W / 4400 surge

Solar in400 W max

ChemistryLiFePO4 · 4000 cyc

Weight38.9 lb

Fridge runtime · calculated 38 h 00

Solar recharge · 2×100 W 13 h 37

Calculated, not observed: 1710 Wh measured usable ÷ 45 W average draw; solar from 150 W effective input (2×100 W derated to 75%). Assumptions.

$999 List price · checked 5 Sep 2026 $0.58 per
usable Wh

Jackery Explorer 2000 v2 →Check price on Amazon Street prices move constantly — we don't quote them.

＋ Strengths

1,710 Wh measured usable — two nights of camp fridge, calculated[4]
44 usable watt-hours per pound, the best density of any unit here[4]
2,200 W continuous with a 4,400 W surge[5]
Publishes both a quiet-mode and a full-load noise figure, which is rare[5]

− Limits

Measured recharge of 2 h 30 against a claimed 1 h 45 — a 43% overrun[4]
400 W solar ceiling on a 2 kWh pack means a very long solar day[5]
Cycles rated to 70% capacity rather than 80%[5]
Not expandable[5]

1,710 measured usable watt-hours is six nights dry, or three with the humidifier.[4] If you live somewhere outages run for days, or the therapy is not optional, this is the capacity that turns a worry into a non-event.

Its 400 W solar ceiling and 70% cycle retention are weaknesses in general use, but for a unit that sits charged waiting for an emergency neither matters much.[5]

3 · Bluetti AC70 — one night, small and cheap

#3 Cheapest that covers a nightSub-1 kWh

PRODUCT SHOT
1:1

8.5 Weighted / 10

Bluetti AC70

Capacity768 Wh rated

Usable690 Wh · 89.8%

AC output1000 W / 2000 surge

Solar in500 W max

ChemistryLiFePO4 · 3000 cyc

Weight22.5 lb

Fridge runtime · calculated 15 h 20

Solar recharge · 2×100 W 5 h 07

Calculated, not observed: 690 Wh measured usable ÷ 45 W average draw; solar from 150 W effective input (2×100 W derated to 75%). Assumptions.

$359 List price · checked 5 Sep 2026 $0.52 per
usable Wh

Bluetti AC70 →Check price on Amazon Street prices move constantly — we don't quote them.

＋ Strengths

690 Wh measured usable from a 768 Wh pack[6]
Cheapest per usable watt-hour of any unit on this site
Expandable to 1,574 Wh with a B80 battery[7]
UPS transfer measured at 14 ms against a 20 ms specification[6]

− Limits

Measured by StorageReview, so the percentage is not directly comparable with the OutdoorGearLab figures
1,000 W output rules out kettles, heaters and most power tools[8]
Bluetti's manual and marketing disagree on AC input, 850 W against 950 W[8]
No independent recharge timing published

690 measured usable watt-hours covers two nights dry or one with the humidifier, for $359.[6][7] At 22.5 lb it travels reasonably.

It also has a measured 14 ms UPS transfer, so if you keep the machine plugged into it permanently the changeover on an outage should pass unnoticed.[6] For a unit that lives beside the bed, that is a genuinely useful property.

Practical points

Turn the humidifier off on battery. It is the single biggest lever you have — it doubles your nights at a stroke.

Use the DC output if your machine supports it. Many CPAPs accept 12 V directly. Skipping the inverter avoids the AC conversion loss entirely and can extend runtime by 10–15%. You will need the correct DC cable from your machine's manufacturer; do not improvise one.

Keep it charged. A power station sitting at 40% is not a backup. If it is there for medical use, top it up monthly.

Check your own machine's draw. The 35 W figure is typical, not universal. Your machine's label or manual gives its rating, and pressure settings move it.

Consider UPS mode. Several units here switch over in 10–20 ms. Leaving the machine permanently plugged into the power station, with the power station plugged into the wall, means an outage causes no interruption at all.

FAQ

How many nights will a power station run a CPAP?

About three nights on a 1 kWh unit with the humidifier off, or a night and a half with it on. A 2 kWh unit roughly doubles that. Calculated from independently measured usable capacity at 35 W and 70 W.

How much power does a CPAP use?

Roughly 35 W with the humidifier off and about 70 W with it on, with heated tubing adding around 20 W more. Pressure settings and mask leak both move the figure, so check your own machine.

Does turning off the humidifier really matter?

It is the largest single factor. The humidifier is a heating element, and switching it off roughly halves consumption — turning a night and a half of runtime into three nights on the same battery.

Will the Anker SOLIX C300 run my CPAP overnight?

No. Its 230 measured usable watt-hours give about six and a half hours at 35 W, which is short of a full night, and roughly three hours with the humidifier on.[2]

Can I use a power station as a UPS for my CPAP?

Several units here specify switchover times of 10–20 ms, and the Bluetti AC70's was independently measured at 14 ms.[6] Keeping the machine plugged into the power station permanently means an outage should not interrupt therapy. Confirm compatibility with your equipment supplier.

Signed verdict SPA · 2026-09-05

Three nights is the right target

For CPAP use, buy capacity you will not need on a normal night. The Anker SOLIX C1000 Gen 2 gives three nights with the humidifier off for $499.99, which is the best balance of cost and margin here.

If outages where you live run for days, or the therapy is not optional, step up to the Jackery Explorer 2000 v2 and its six nights.

If you only need to cover a single night and want something small and cheap, the Bluetti AC70 does it for $359 and switches over fast enough to act as a UPS.

Do not buy the Anker SOLIX C300 for this. It will not last the night.

Anker SOLIX C1000 Gen 2 →Check price on Amazon

Sources

Every figure on this page traces to one of these

OutdoorGearLab. Anker SOLIX C1000 Gen 2 Review. Independent lab test · accessed 5 September 2026
OutdoorGearLab. Anker SOLIX C300 Review. Independent lab test · accessed 5 September 2026
Anker SOLIX. SOLIX C1000 Gen 2 — specifications. Manufacturer spec · accessed 5 September 2026
OutdoorGearLab. Jackery Explorer 2000 v2 Review. Independent lab test · accessed 5 September 2026
Jackery. Explorer 2000 v2 — specifications. Manufacturer spec · accessed 5 September 2026
StorageReview. Bluetti AC70 and AC2A Portable Power Station Review. Independent lab test · accessed 5 September 2026
Bluetti. AC70 Solar Generator — specifications. Manufacturer spec · accessed 5 September 2026
Bluetti. AC70 User Manual. Manufacturer manual · accessed 5 September 2026

SPA

The Solar Power Auditor desk

We do not run our own bench. We collect published laboratory measurements from independent testers, put them beside the manufacturer figures, and show the arithmetic behind every runtime we quote. Where nobody has measured something, we say so rather than estimating it.

How this site works →