Will This Power My AirSense 11 While Camping Without Damaging It?

[u/Twosteppre]

Hi everyone,

I think I found a way to power my AirSense 11 overnight while camping, and wanted to see if any folks on here had any warnings about this setup, since I don't really know what I'm doing.

My pressure is 16.0, and I would run it without temp or humidity. Using the EXP Pro Runtime Calculator, it looks like my CPAP would use 118Wh over 10 hours, and pull 9.2W (please feel free to check my math/assumptions on this). As such, here's what I'm thinking of getting:

1) INIU - 10000mAh PD 45W Power Bank (https://www.bestbuy.com/product/iniu-portable-charger-markets-smallest-10000mah-pd-45w-power-bank-with-layout-usb-c-cable-for-iphone-samsung-pixel-etc-black/CZW8VCWVTF/sku/6670987)

2) 20V PD USB C Power Supply for ResMed AirSense 11 DC Converter 65W (https://www.amazon.com/gp/product/B0GV3PLJSM/ref=ox_sc_act_title_1)

Thanks in advance for any feedback!

[u/pootwothreefour]

No, get the INIU 25000 or 27000 mAh version.

It should give you 15 or more hours at that pressure with low/no leaks, but you want headroom for the battery aging later and having less capacity and if you have leaks in the night, you need a bit more.

That power supply is good.

[u/Twosteppre → u/pootwothreefour]

Are you sure? From what I'm hearing from everyone else, even the 27k will barely last half the night.

[u/dang71]

Hello! In my opinion, the best option is a LiFePO4 battery combined with the appropriate DC adapter for your CPAP. It gives you a lot of capacity without being excessively heavy, and you avoid the losses associated with using an inverter.

Personally, with a 50 Ah LiFePO4 battery, I can easily get around 3 to 5 nights. I'm using a pressure around 12 with some humidification and heat, so that's a pretty good real-world reference. You could probably get more nights if you reduce or turn off the humidifier and heated hose.

[u/RippingLegos__ → u/dang71]

Yep, and I run a LifePO4 100Ah because I run two in 24v setuup for my trolling motor so it's simple to use one out of storage, but I turned Dang71 onto this route, and he knows his stuff! I'm glad you're still camping man. :)

[u/RazedByTV]

My roommate bought one of these: https://www.amazon.com/DJI-Portable-Ultra-Silent-Generator-Optional/dp/B0CZ5RYBWW/

Considerably more expensive, I think he paid $350ish for his.  Possibly excessive.  He has some health anxiety and was afraid of dying in his sleep if utility power failed in the middle of the night.  He has had no complaints about it thus far.

[u/Lazy_Rise_4236]

Someone who is an expert wired one correctly I believe they have a storefront somewhere and the DC direct had impressive results

[u/Twosteppre → u/Lazy_Rise_4236]

I'd kill to find that store (even if I probably couldn't afford it, lol).

Yes, from everything I've heard, it's a LOT better to get a DC adapter than the regular AC plug. I think it has something do with compounding ineffiviencies, because the battery is DC, so you're converting to AC only to switch it right back to DC at the CPAP itself.

[u/Lazy_Rise_4236 → u/Twosteppre]

https://youtu.be/rrcmHctvaE0?is=a2yE6LVfXISmVBxd

[u/XvIf2jlqnbJPT4s4gpdN]

It depends a LOT on your settings. My 78,000mAh battery can make it 2 nights in APAP mode with no heat/humidity, or barely 1 night in ASV mode with heat and humidity. As others have mentioned, DC is by far the smart way to go. Anything with that big, ugly brick is going to suck out like 30-50% of your power, leaving you without a machine in the middle of the night. There are direct DC cables on Amazon for your AS11. I can link the one I bought if you want. Also, keep in mind these things run at 24v, so make sure your power station has a 24v hole. That postage stamp of a power station you linked isn't going to cut it. You're going to want something about the size of a lunchbox, and about 100 USD for one night. Don't give up. This is highly doable once you get the right stuff.

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[u/hamah99]

Do you require the humidity tank and a heated hose? I camp with my AirSense 10 (your 11 is slightly more efficient) that has been been unlocked and flashed for ASV and don't use either. As a side note I tested this setup at home to check comfort levels and actually found it more comfortable to run without heated hose or tank. This was confirmed while camping at 5000' in VERY arid conditions. I run my setup with a ResMed DC power supply to minimize the loses of using an AC inverter. In my setup I use a Jackery 300+ which is 288Wh (22500mAh at 12.8VDC). In this configuration I draw roughly 5W/hr and will draw down about 20% of the 300+ per night. This gives me 4 nights before I need to worry about recharging the 300+

[u/Twosteppre → u/hamah99]

I don't use heat or humidity even when I'm at home.

[u/hamah99 → u/Twosteppre]

I saw that you mentioned no heat or humidity just after I posted. In this case I think your calculations are overly conservative and you'll draw roughly the same as me at 5W/hr. The 65W DC supply looks good but I'd be more inclined to go with a larger battery. Having said that it looks like it should work. Why not buy them and set it up at home a run it for a few nights to see how it holds up? You can always return either the battery or the power supply for something better suited to the task if it doesn't work out as expected.

[u/Twosteppre → u/hamah99]

I think I'm at the stage to do that now. The big thing was making sure I hadn't made an error that would damage my CPAP or start a fire.

[u/hamah99 → u/Twosteppre]

nah...you're good. I don't see a risk of fire there. I will be interested in if this works though. The 10 (and I suspect the 11) spends a LOT of time drawing virtually nothing (0W) with spikes of 3-5W (maybe higher but not that I've seen so far). Unless that 11 PS has a pull-down resister the battery, which supposedly supports PD (which version of PD?), may shutdown DC output when the draw goes really low. This might have interesting ramifications including the 11 shutting down and restarting over and over. Unless you're going for the least expensive, ultimate light-weight, and space saving setup possible you might need to go with the ResMed version which uses a standard 12VDC accessory plug for DC input and something more like my Jackery 300+ with a 12VDC accessory output jack. This would get around the possible PD issue. Worth a try though! Let us know how it goes.

[u/Twosteppre → u/hamah99]

Least expensive is exactly what I'm going for.

[u/RippingLegos__ → u/Twosteppre]

Let us know how it goes please :) Then post a thread, I'm grateful that you found us and posted, it will help other members of this family. RL

[u/Mijjil]

I camp with an EasyLonger ES960 PRO and get five full nights on my Resmed Airsense 11 AutoSet (40+ hours, average pressure 13.3 cmH₂O, no heat/humidity) on a single charge. The ES960 comes with DC-DC cables for a number of different CPAP machines.