Cpap for extended wilderness camping?

General Discussion on any topic relating to CPAP and/or Sleep Apnea.
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Re: Cpap for extended wilderness camping?

Post by SleepGeek » Sat Jun 18, 2022 6:07 pm

Excellent Andy - I'm wondering if you were able to charge after the first nite then again after the 2nd how much time that would have taken? Surely it would be easier on the battery but another good option for using battery power.
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Re: Cpap for extended wilderness camping?

Post by glacierjay » Tue Jun 21, 2022 12:51 pm

To keep the conversation alive... here are some of my results from trying out a number of battery packs.

Initial conclusions: battery packs under 20000 mAh are not useful. A 20000 mAh battery might deliver 2 nights, 30000 mAh maybe 3-4 nights, 70000 mAh battery can deliver 8-9 nights. I use 20-25 Watt hours each night at 7-8.5 CM pressure on a Z2 APAP.

I used a JacobParts 15V USB-C PD trigger cable for most of the tests as the Z2 is supposed to run on 15 volts. This means when you're looking at battery specs you need to ensure it is capable of USB-C PD at 15 volts. Usually this means at least a 45 watt power capability (a "laptop" charger, not a "phone" charger). You will see something like this in the online specifications: "Type-c Output: 5V-3A / 9V-3A / 12V-3A / 15V-3A / 20V-3.25A (65W Max)". The part that says "15V" is important. If there's nothing like this, chances are that the battery you're looking at will not work with the Z2.


Most relevant columns are Advert mAh: the advertised size of the battery. Tested Wh: the power I was actually able to get from the battery at 15V PD. Tested sleep hours: how many hours of sleep I got before the battery was empty.

It's kind of geeky. I'll clean it up when I decide what information is actually useful for shopping. I have a couple more I want to try out but thought I'd post my progress to date. Lots of camping, not much hacking going on here so this project has ground to a halt for now.

Renogy GP-14:
Baseus: ... B08JV4W4NY
Nitecore: ... b20000.htm
Ravpower: ... power-bank

Rob K
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Re: Cpap for extended wilderness camping?

Post by Rob K » Thu Jun 30, 2022 8:23 pm

Glacierjay thanks for posting all that info. That will help a lot of people.

My two week trip off grid didn't go as planned. I normally don't drive anywhere once I get camp set up but I had to drive a couple times and my trip was cut short and was only able to stay a week. I had bought two Baseus banks and the large Renogy. All I used for the week was one Baseus 30000 bank. I ran it on apap 8-10cm. Pretty certain it didn't ramp up the pressure so basically it was running at 8cm. The two drives I did where around 30-45 minutes each. I didn't monitor the charge but looked a the charge percentage on the battery bank. Each drive seamed to charge the bank enough that I would gain and extra night or two in that time. I slept for seven nights and think there may have been one night left in the bank. Since I didn't measure anything my guess is that I was able to recharge the bank with 1.5hrs of driving. That is a guess since I wasn't really keeping track. My Baseus cigarette lighter charger was charging the Baseus bank at around 69watts when I was driving. That's more than I've seen idling in the driveway. That's a pretty quick charge. Makes me think of getting a bank that charges at 100watts. With a short drive you can replenish a battery bank. Something to consider for the future.

It was great to leave the 100lbs of deep cycle agm batteries at home. So glad I switched to the Z2 and lithium. Time will tell if they remain reliable and trouble free. I have enough battery banks to easily last a couple weeks and with a little driving I can extend that significantly. I guess I'm skipping the solar for now but will keep researching. My hope is to do some kayak camping in the coming years. Still need to figure out if it's worth solar charging or just carrying all the batteries I'll need. I can carry more weight in the kayak vs backpacking.

I did monitor the temps inside my sit on top kayak. I wanted to see if it would be safe to store or possibly charge batteries inside the kayak. Water temps ranged from 61F to 76F on Lake Michigan, mostly upper 60's and low 70's. I monitored temps inside on sunny days that were in the 70's. I never really let the kayak sit on shore with the hatch closed so I suspect the temps would have climbed a bit. Also air temps were not real hot. When it was parked on shore I left the hatch open after getting out my lunch and drinks. The temps inside the kayak never got higher than the 80's. That's well within safe storage and charging parameters for lithium.

Machine: AirCurve™ 10 VAuto BiLevel Machine with HumidAir™ Heated Humidifier
Mask: AirFit™ N10 Nasal CPAP Mask with Headgear
Additional Comments: Resmed F10 Mask for colds. When camping on battery power I use P10 mask and PR 560p machine.