What Size Solar Panel Do I Need for a CPAP Machine?

60W running draw8h/day defaultmedical

Quick Answer

A CPAP Machine at 60W needs at least 200W of solar panels to run sustainably. Running 8 hours per day draws 480 Wh daily. A single 200W solar panel covers it. Pair with a 150Ah LiFePO4 battery at 12V for 2-day cloudy weather reserve. The EcoFlow River 2 is the simplest all-in-one solution for this load.

System Specs for a CPAP Machine

Calculated for 8 hours/day usage, 5 peak sun hours, and 2-day LiFePO4 battery autonomy.

ComponentMinimum SizeDetails
Daily Energy480 Wh60W for 8h
Solar Panels200W1x 200W panel covers it
Battery150Ah at 12VLiFePO4, 2-day reserve (1.4 kWh usable)
Charge Controller30A MPPTHandles up to 200W panel input at 12V

Running more than just a cpap machine? Add more appliances to your load with our full calculator

Recommended Power Station

EcoFlow River 2

256Wh capacity, 300W AC output — ideal for phones, laptops, CPAP, and small electronics.

256Wh

Capacity

300W

AC Output

110W

Max Solar In

Buy on EcoFlow.comView with Solar Panel Bundle

DIY Component List

Building your own system for a cpap machine? These components match the specs above.

Solar Panel

200W total

Renogy 200W 12V Monocrystalline on Amazon

Battery

150Ah 12V LiFePO4 minimum

LiTime 12V 200Ah LiFePO4 on Amazon

Charge Controller

30A MPPT minimum

Renogy 40A MPPT Rover on Amazon

About the CPAP Machine Solar Load

A standard CPAP machine draws 30–80 watts depending on pressure setting and heated humidifier use. Without the humidifier, draw drops to about 30–40 watts. With humidifier on high, it can reach 80 watts. Budget 60 watts as a reliable average. Eight hours per night equals 480Wh of daily consumption.

Frequently Asked Questions

How much solar do I need to run a CPAP machine?▼
A CPAP machine without the heated humidifier uses about 30–40 watts and runs 8 hours per night, consuming 240–320Wh. With the humidifier on, bump that to 60–80 watts, or 480–640Wh per night. A 200W solar panel generates 800–1,000Wh per day in most US regions, which easily covers CPAP use plus phone and laptop charging. The EcoFlow River 2 (256Wh) is the minimal battery for one night without a panel. For full off-grid CPAP use, the River 2 Pro (768Wh) with a 110W panel covers three nights of CPAP use without sun.
Can the EcoFlow River 2 power a CPAP all night?▼
The EcoFlow River 2 has 256Wh of capacity. At 30 watts (CPAP without humidifier), it lasts about 8 hours — exactly one full night. With the humidifier on and draw at 60 watts, battery life drops to about 4 hours. For reliable all-night CPAP power, the EcoFlow River 2 Pro at 768Wh is the better choice, giving you 12+ hours at 60 watts. Both units support solar charging, so a 110W panel paired with either unit will fully recharge during the day for the next night.
Does running a CPAP on DC power extend battery life?▼
Yes, significantly. Running a CPAP through DC power (12V adapter or USB if available) eliminates the AC inverter conversion loss, which typically runs 10–15% on power stations. At 60W AC draw, switching to DC reduces actual battery draw to about 52W — saving almost 64Wh per night. Some CPAP models like the ResMed AirSense 10 and AirSense 11 accept a 12V DC power adapter sold separately for about $30. Check your CPAP model's compatibility before buying the adapter.

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