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  1. #11
    Crazytown3's Avatar
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    For me anyway, one of the drawbacks to using a ResMed system like I do, is they are 24v systems. So I either have to use a native 24v battery, or use 12v with a converter, etc. I don't know what the efficiencies of 24v vs 12v are, but it seems people are able to get a little more out of their 12v systems.

  2. #12
    Senior Member Cruiser51's Avatar
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    Doow ... sometimes more, sometimes less, but at least 8 hours on average. No tricks, I plug it in when I go to sleep, and unplug when I get up .... I use a pressure of 6 cm and that is a key point, power used is proportional to the pressure setting.

    I just bought a power monitor, that I have wired up to a 12 car adapter extender, I plan on measuring the actual power I use through the night (AHrs and WHrs), with my current unit, then swap over to the new Dreamstation and do the same.

    As an aside, the reason for using the manufactures car adapter cable is they usually have an efficient voltage controller to keep the voltage correct, I don't really know how important this is, but I will only use the manufacturers cable as it protects me warranty wise.

    Another point to consider is that you should use a pressure setting that is optimized, that is one that is as low as you can use and still get the required therapy .... this isn't always the number that you get from a sleep study (in fact, I am quite convinced that in a lot of cases it isn't, it is one that will work, but not the lowest one). I am not suggesting you become your own specialist, but do get involved in the process and see if you can get away with less pressure.

    I pulled some basic data on my Respironics ...

    Some one posted measurements for a similar machine to mine : at 10 cm, 8 hours it will use ~4 AHrs

    - I am at 6 cm, so for 8 hours it should use 2.4 AHrs
    - the battery is 22 AHrs (266 WHrs), so 22/2.4 is about 9 nights on paper

    The reality is that it runs a lot longer, hence those "internet" numbers are good for estimating, but I want to do some better real world measurements.

    If there is an interest, I plan to post a "formula" to help folks figure out what they will need to meet time goals while camping .... once I get the measurements done.

    Brian

  3. #13
    New Member
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    I would be very interested in your formula. I am also running a respironics sans humidifier but i'm running my machine at a 11. I Hadn't thought of turning it down. i might give it a try.

  4. #14
    Senior Member Cruiser51's Avatar
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    If you decide to try a different pressure, I would suggest getting the open source software (called Oscar) to allow you to download your data from the SD card. It gives a summary and graphs of your various parameters during sleep ... Apnea Board is also a good resource for learning about what a lot of the "stuff' means. Why not just use the Respironics software you can sign up for?, you ask ... good question, the "Terms of Use" basically say that the data gets uploaded to the company and it then becomes "their" data to do whatever they want with it, which includes selling it in whatever form they want, essentially using their software turns your data into their corporate asset, the open source version keeps the data local, it never leaves your home.

    I am not condoning taking your prescription into your own hands, I do mine in conjunction with my specialist, but he is pretty cool and is wiling to work with me. If you do any changes, make sure you know how to read the graphs (totally not hard, just a little bit of research) so that you can tell if your changes are adverse or not. The prescription isn't as "carved in stone" as some believe.

    In my case for example, I have been running fine at 6, which I review quarterly, so I do know the therapy is working. I have run it at 5 for 2 years which also works, but doesn't feel as comfortable. The recent sleep study came back at 8 ... I talked it over with the doctor and he agreed what I have works fine and wrote a script that allows me between 4 and 8 ... which gives me a lot of leeway. The point is that you may be able to safely lower the pressure, or you may not ... but if you want to do it long term (something other than a couple day trial) I suggest you do it in conjunction with your medical practitioner. You can also get a copy of ther clinicians manual for your specific machine from the Apnea Board as well.

  5. #15
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    Here is my setup for backpacking. I just used this on a trip to eastern Iowa with my Ridgerunner hammock; it was just an overnight. Overnight temps were in the upper 20s and it worked very well. I'm sure I could have went another night.

    CPAP/Battery Pak - grams/ounces
    Resmed Airmini - 294/10.4
    Mask & Hose - 109/3.8
    Adapter cable (Medistrom) - 24/0.8
    TalentCell 24V LI Battery PB240A1 - 416/14.7
    Total - 843/29.7

    Iíve used this on several trips and usually get 3 nights use out of one battery. The Airmini is an autoset machine and I generally set it for max pressure of 6 or 7. The most difficult piece to get is the Medistrom adapter cable. I got it with the Medistrom battery setup, however the TalentCell battery is lighter, cheaper and lasts longer than the very expensive Medistrom battery. I think you can just buy the adapter cable, but it is outrageously priced at around $50. Here is a pic of my entire setup.

    IMG_0689.jpg


  6. #16
    Senior Member Tyroler Holzhacker's Avatar
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    One real downer about cold weather use of a Cpap unit is that you have to use non heated breathing tubes meaning you are breathing in super cold air. Ideally Cpap use is above freezing. The Cpap battery also was adversely affected by the cold weather.

  7. #17
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    Quote Originally Posted by Cruiser51 View Post
    If you decide to try a different pressure, I would suggest getting the open source software (called Oscar) to allow you to download your data from the SD card. It gives a summary and graphs of your various parameters during sleep ...
    I have used that program in the past. I had to give a report on my CPAP usage for a DOT physical. The company I got the machine from wanted to charge me $75 for the report! I was able to use the other software for free. You are right, there is a lot of really interesting information in that report.

  8. #18
    New Member
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    Steve, I like your setup. that is pretty impressive weight for a battery setup. I might weigh up my setup next time I go out. I know it'll be ridiculous.

  9. #19
    I completely misread that title....

    Sent from my HTC U11 using Tapatalk

  10. #20
    Senior Member Cruiser51's Avatar
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    Quote Originally Posted by Tyroler Holzhacker View Post
    One real downer about cold weather use of a Cpap unit is that you have to use non heated breathing tubes meaning you are breathing in super cold air. Ideally Cpap use is above freezing. The Cpap battery also was adversely affected by the cold weather.
    My lithium battery is fine down to -10c or so ... the documentation that bit came with says even lower ... so I don't think there is that much issue with the batteries and a bit of cold weather. If I am outside, I sort of expect to breath cold air and the machine doesn't pump that much air to cause any issues.

    When the temp drops down, I usually throw a jacket over my head, it warms the whole head area up nicely.

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