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[Equipment] Building An Ultra-Light CPAP For Backpacking? Possible?
#1
Building An Ultra-Light CPAP For Backpacking? Possible?
Getting ready for a 4-week backpacking trip in the Sierra Mountains in California so I need the lightest possible CPAP device that uses the least power. The lightest commercial one I've found is more than 6 lbs with battery and solar charger—so that's a no-go.

Has anyone experimented with making their own low-tech machine for this purpose? I've been using a regular CPAP machine for 8 years so I can pretty much tolerate any kind of airflow. I'm not a light sleeper.

The part I need help with is thinking it through. Since I'll be asleep, I'll have no idea whether it's helping or just making noise and that's where you experts come in. 

I have a spare CPAP blower motor, what would be the therapeutic effects if I hooked it up a regular CPAP hose at one end and a battery to power leads? Would a 1-way valve help? Would I need a speed control? 

This piece of equipment only has to last 4 weeks so longevity is not going to be a factor.
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#2
RE: Building An Ultra-Light CPAP For Backpacking? Possible?
You would need a speed control that senses pressure and adjusts to maintain that pressure. My original CPAP, a total brick had a screw to turn to manage the pressure. Actually all you have to do is maintain a single fixed pressure assuming the intentional mask leak is there, so a POT to tweak pressure.
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#3
RE: Building An Ultra-Light CPAP For Backpacking? Possible?
I came across these PDFs in another thread from March 2019.

Easy to build and affordable CPAP device for adult.pdf
and
Another PDF including pictures, schematics and code
Here is the thread: http://www.apneaboard.com/forums/Thread-...t-DIY-CPAP
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#4
RE: Building An Ultra-Light CPAP For Backpacking? Possible?
The problem is not the CPAP itself. The Resmed Mini is very light and compact until you add in an adequate battery and especially a solar panel. I'd say the O.P has done his homework because 6-lbs is on the bleeding edge of lightweight complete systems that can run for weeks. I'd be interested in hearing what the 6 lb setup is. That is actually very good compared to what I have seen.

It's hard to get away from the nearly linear relationship of weight to power capacity in any give battery chemistry, and while we have thin-film solar panels, they have to have enough capacity to recharge a Li-Ion batter, while traveling from place to place with the panel draped on the pack. Add in cords, mask, tube and charger controllers, and 6 lbs starts looking really good.
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#5
RE: Building An Ultra-Light CPAP For Backpacking? Possible?
Is it possible a LiFePO4 battery type may do it for you? Example of one that is suited for amateur radio usage that is 12V at 12Ah is 3.3 pounds and $124 for battery only. Within the radio use battery section, they have 12V from 3Ah to 300 Ah. And they have different voltages too such as 24, 36, 48 Volt deep cycle LFP. They have solar chargers and controllers as well. If it is interesting, look up the website Bioenno Power.
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INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEBSITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
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#6
RE: Building An Ultra-Light CPAP For Backpacking? Possible?
I can source Li-ion with less weight and more capacity that lithium iron batteries, but the lithium iron has the advantage of safety. Speaking from personal experience, the LiFePO4 batteries are destroyed from deep discharge. I own a Shorai on my motorcycle that didn't go a year.
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INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
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#7
RE: Building An Ultra-Light CPAP For Backpacking? Possible?
A screw? That’s the kind of low-tech thinking I was hoping for.
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#8
RE: Building An Ultra-Light CPAP For Backpacking? Possible?
(02-14-2021, 08:23 PM)koi3.3 lbs is a little high. I was hoping to keep the battery pack under 2 lbs. I have the opportunity to plug in a couple of times during the hike.SarcasticDave94 Wrote: Is it possible a LiFePO4 battery type may do it for you? Example of one that is suited for amateur radio usage that is 12V at 12Ah is 3.3 pounds and $124 for battery only. Within the radio use battery section, they have 12V from 3Ah to 300 Ah. And they have different voltages too such as 24, 36, 48 Volt deep cycle LFP. They have solar chargers and controllers as well. If it is interesting, look up the website Bioenno Power.
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#9
RE: Building An Ultra-Light CPAP For Backpacking? Possible?
That battery was a sample. As is it may not be the right battery type after all.
Dave

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INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEBSITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
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