I am thinking about buying a back up power supply for a CPAP machine. After looking around on line, I am confused. I want one that you plug into the wall, then plug the CPAP into the power supply and forget about. It stays charged up and runs the CPAP for a few days if the power goes out. I want one big enough to run the CPAC with the humidifier. Looking on line I have found an assortment of stuff with varying claims for length of time it will run and rather or not you can use the humidifier. Thanks for any advice.

Figure out your power requirements and look at computer UPSs.
They’ll work just the way you want, but I honestly don’t have a clue about if they will meet your power requirements for a CPAP.

If you’re looking for plug-in to the wall for 120 V and multiple days of use with the humidifier, I would be very surprised if you find one that is not extremely expensive. I was looking just a few years ago and using the humidifier can make it use twice as much as without. I ended up looking up my cpap which was an air sense 10, and seeing that I really couldn’t run it more than one full night on a decent sized one of those units with the humidifier.

I learned a lot I didn’t know. Things like the number you run at has a lot to do with it, and since mine ran at 18, I use a lot more juice than folks running lower. And that using a CPAP on 120vac requires a sine wave power signal which requires a sine wave inverter. You lose a lot of power to the conversion and heat that’s generated. Since my CPAP is 24 V running a 12 to 24 V converter or adapter is a lot more efficient.

Because I am a glutton for punishment, I built a battery box and used a 12 V adapter. It has a 12 V adapter a couple USB‘s and a light built into it. In the end by the time I bought a 500ah LiFePO4 battery for it and all the parts it probably wasn’t much cheaper than buying one of the fancy boxes. With my humidifier off I’ve run it for three days without running below 40%.

I think your best bet is one of the battery packs or solar power generators. It will run longer if you can get a 12 volt adapter versus a sine wave inverter. And you’ll likely have to accept that you won’t be able to run the humidifier or if you do, it will significantly cut your run time down.

This message has been edited. Last edited by: buddy357,

I camp and when off grid I use an Old Car Battery and a 50w Solar charger - I use a inexpensive 800w inverter sometimes but most often I use a 12v DC Cig lighter attachment for my Phillips ResMed CRAP. I forgo the Humidifier as my setup would never power it and it's usually pretty humid out with doors and windows open.

A smaller solar generator aka battery pack will do the job. I let a good friend borrow my Ecoflow River 3 for that purpose during the big winter snow storm.

I bought this one and as other have mentioned, the 12V adapter for my Phillips. Works well but have not gone longer than 24 hours without electric.

Power Bank

quote:

Originally posted by SpinZone:
Figure out your power requirements and look at computer UPSs.
They’ll work just the way you want, but I honestly don’t have a clue about if they will meet your power requirements for a CPAP.

My father's entire career was in Bio-med, that means all that hospital equipment that beeps and pumps, and keeps you alive. I can assure you, a large computer UPS is exactly what you're after.

Without knowing the power draw of your cpap I would err on the side of caution and consider a larger battery back up like this.

https://www.ankersolix.com/pro...riant=49702371524938

I work for Siemens and repair CT, PET, SPECT machines. A UPS will work, but there are some things to keep in mind. Some CPAP machines much like computers need a true sine wave. Most consumer grade UPS are modified or simulated sine wave and not true sine wave, true sine wave ones usually cost more. Doesn’t mean that you couldn’t use it, but you could potentially significantly shorten the life of your CPAP. You will still need to work out your draw (likely on cpap manufacturer website) vs battery capacity to get the amount of use out of it you’re looking for.

That’s why I stick with a battery box for my use. At the time it was cheaper than the ups with true sine wave. It may not be the case anymore. But it’s also handy to move in case of issues requiring me to travel or camp without power as my potential use case for the cpap. I’ll use my CPAP, my pressure was 18 but if we use 16 because it’s in the chart on the website. On a 12 V battery and drawing 1.23 Amps it uses 14.7, call it 15watts an hour. If I use it without a humidifier or a heated hose for eight hours, that’s 120 Watts. Using the same 12 V battery but dehumidifier on four and no heated hose. It’s now 3.33amp draw. That means 39.96 call it 40 Watts. Which turns out to about 320 W use for eight hours. With the heated tubing on as well ends up out 400 watts used in 8 hours. And you have to keep in mind they recommend not taking the battery down below 50% Ish. They don’t recommend mine being used with a UPS.

Granted I tend to be paranoid and overdo and over build everything after having so little and so poor equipment to work with when I was younger. Good luck with the search. Please let us know what you settled on and how it works out. I’m always looking for new info/ ideas.

Here is what I use. When I’m running it just on the battery I don’t use the humidifier.

It can be set up to power through it and pick up if the power goes out. I have it in that configuration right now actually.

https://a.co/d/01JM9KYs

quote:

Originally posted by chongosuerte:
Here is what I use. When I’m running it just on the battery I don’t use the humidifier.

It can be set up to power through it and pick up if the power goes out. I have it in that configuration right now actually.

https://a.co/d/01JM9KYs

+1

I've had a CPAP for going on 20 years. Every 5 years get a new model and of course the battery for the old model doesn't work because the new model uses a different DC voltage. I borrowed my buddy's easylonger for a 19 hour international flight and was so impressed I bought my own once I got home. It's pretty much the largest battery size you can fly with, can output 4 different voltages (i.e. likely to work on next CPAP too), a great price, and does pass thru charging (i.e. charge while using).

quote:

Originally posted by buddy357:
If you’re looking for plug-in to the wall for 120 V and multiple days of use with the humidifier, I would be very surprised if you find one that is not extremely expensive. I was looking just a few years ago and using the humidifier can make it use twice as much as without. I ended up looking up my cpap which was an air sense 10, and seeing that I really couldn’t run it more than one full night on a decent sized one of those units with the humidifier.

I learned a lot I didn’t know. Things like the number you run at has a lot to do with it, and since mine ran at 18, I use a lot more juice than folks running lower. And that using a CPAP on 120vac requires a sine wave power signal which requires a sine wave inverter. You lose a lot of power to the conversion and heat that’s generated. Since my CPAP is 24 V running a 12 to 24 V converter or adapter is a lot more efficient.

Because I am a glutton for punishment, I built a battery box and used a 12 V adapter. It has a 12 V adapter a couple USB‘s and a light built into it. In the end by the time I bought a 500ah LiFePO4 battery for it and all the parts it probably wasn’t much cheaper than buying one of the fancy boxes. With my humidifier off I’ve run it for three days without running below 40%.

I think your best bet is one of the battery packs or solar power generators. It will run longer if you can get a 12 volt adapter versus a sine wave inverter. And you’ll likely have to accept that you won’t be able to run the humidifier or if you do, it will significantly cut your run time down.

This my experience to a T. The humidifier is the first hurdle and the power supply is just as bad.
I ended up with the 12 volt power adapter and a lithium battery pack 325w if I remember right. Turning to airplane mode gets me 20hrs give or take. It’s gone in on horseback at least 6 times where I limit it to 4 hrs a night to get me through a hunt.

I’m on a bidget and a weight limit just can’t see a dorm fridge and $2000

I just went out and bought a small Honda generator.

Generac 22kw

How many watts/hour does the CPAP+humidifier require? Had a sinewave UPS for my modem/router that would keep wifi going for about 3 hours. Decided that might not be long enough, so for the same price as the UPS got a Bluetti Elite 30 V2 that acts like a ups and will supply 120 vac sinewave for about 13 hours if power fails. Thats almost the smallest they make; any of their larger Elite models will run longer in ups mode.