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Old 06-02-2018, 01:30 AM   #29
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Thanks for the info, David. This has been helpful.
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Old 09-24-2018, 10:46 PM   #30
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Originally Posted by DKB_SATX View Post
I have the same CPAP machine. I had an S8 Compact before that ran on 120v, and I didn't question the machine my insurance company replaced it with when the 7-yr-old S8 couldn't maintain pressure anymore... I knew it was DC in but didn't realize it's 24V!

I think the "Freedom" battery packs are a terrible deal. I'm not TOO sure about the $85 DC-DC power supply from Resmed, but if it destroys my machine they can hardly complain about it being my fault, so I may get one of those rather than just putting 2 small AGMs in series which was my first thought.

I'll probably wire a 12V socket by the bed and try the trailer batteries first. I can run it overnight off the inverter and get the batteries charged back up with my 160w portable solar on a sunny day, but the cheapo inverter isn't particularly efficient so I think it would work better with the ResMed power supply running directly off DC.

The 90W, by the way, it at max pressure with the humidifier running full tilt. Most users who've measured report about half that... I should dig up my Kill-a-watt and see what mine actually pulls on a normal night. For the old S8 I just went by the specs and bought an efficient inverter and an overkill battery... I thought I'd be doing well to get 10 hrs out of it, it would run more like 24! I didn't have an inverter built into that trailer.
We are going to stock the new EXP 380 Pro and you can use them up to 3 nights before charge. Solar charging even available for boondockers. 3 USB ports, just a great machine as far as I can tell. I don't bite many lures but this has real features and nothing on the market in the class comes close. I'll let you guys determine if I'm right. 144 watt hours. 2-3 nights of power.
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Old 09-24-2018, 11:06 PM   #31
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I used to travel a lot and currently use a Philips Respironics DreamStation Go with the battery. I used it earlier this year on a camping trip, charging the battery via an inverter while driving. It worked great. I like it a lot better than the Z1 I had (with battery), though it is about twice the size.

Unlike my machine at home, the Go doesn’t have a humidifier (yet) but so far that hasn’t been an issue.
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Old 09-25-2018, 04:17 PM   #32
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Check her AHI scale, she may be able to have a dental apnea appliance if she has mild apnea. Would not use any power.
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Old 02-02-2019, 01:46 PM   #33
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CPAP Machine Useage

When off the grid I use my Honda 2000 in the bed of the truck and have modified the cap on the Honda to run from a 5 gal can in the truck bed and it has ran for more than 36 hrs straight this way. So in the morning I can make coffee without getting out of the trailer.
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Old 02-03-2019, 06:23 PM   #34
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Air Mini

The 16 hour Lofta Air Mini is small compact ac or battery.
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Old 02-03-2019, 09:12 PM   #35
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My wife and I both use a Philips Respironics DreamStation. We got the 12 volts adapter cables and I installed a cigarette lighter outlet between the beds. We use the humidifiers and it runs all night drawing very little of our total battery power.
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Old 02-09-2019, 10:57 AM   #36
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CPAP Experience

Hi Folks,

I use a Resmed S10 with all the bells and whistles and a full-face mask that ramps up to max pressure over the course of a night. I use my CPAP every night, everywhere in the world. I haven't missed a night in 15 years and didn't intend to start when we got the Airstream.

We did a 3 week trip cross country (from W to E) over January. We stayed in state parks, campgrounds, parking lots, everywhere. Our longest dry camp was 4 nights.

We have a 2018 International 30' with upgraded batteries (not lithium) and 400W of solar on the roof. Winter camping so the solar wasn't super awesome imho.

To ensure CPAP use I bought the 12v adaptor for my machine, two freedom batteries with necessary adaptors, and two Honda 2000 generators that run off propane. Overkill. However, it did give me the opportunity to explore multiple solutions.

When we are at full hook-ups (50AMP or 30AMP) I plug the CPAP into an AC outlet at the bedside and use full therapy as usual. No problems. Just like home with the exception that I had a couple of rainouts due to high humidity but got that solved with some tweaks to the heated tube and a tube wrap.

For a single night of dry camping I was able to run the CPAP full-out using the 12v adaptor without draining the AS batteries below what seemed to be a good charge. However, it did pull a lot of charge from the batteries. The charge jumped up just fine after sun-up when the solar started to do it's thing. I don't think I would do this without upgraded batteries. On another night I disabled the humidifier (went passive, still had water in the tank, just no heat) and disabled the heated hose. This also worked fine and drew less from the AS batteries but it still seemed to pull a lot given that I had turned-off the largest power hogs on the machine.

Using two freedom batteries in tandem I was able to run the machine only (no bells and whistles) all night. Plenty of charge left in the AM. I also tried the heated humidifier and no other stuff and had charge left in the freedom batteries in the AM. When I ran the machine full-out on the freedom batteries, they both drained to zero before the end of the night.

We only used the generators when dry-camping to bump up our battery charge. We never ran them all night to enable CPAP. So the generators were surely the emergency back-up plan.

How I plan to manage in the future:

hook-ups = normal use
1 night dry-camp = 12v AS power, no humidifier, no heated hose
multi-night camp = double freedom batteries recharged from the generator or via the trailer inverter (if there is sun for the solar) during the day.

We're doing 10 weeks over summer so I'll test more there. I might play with the amount of humidity or temperature of the hose to see if I can tweak the power drain without going to an all or nothing position.

If I were doing this without investing a ton of money I would acquire CPAP modification gear in the following order and see how each worked for your unique therapy:

12v adaptor
Freedom batteries
generator.

If you need the generator for other reasons you might change the order I suppose.

My $0.02

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Old 02-10-2019, 07:23 AM   #37
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Thanks for the information Spatters.

I have the exact same machine and find that the Freedom batteries don't make it through the night. I do the same as you and use the machine, full out, when plugged into 30A.

I have solar and can recharge the batteries during the day. Haven't bought a small generator to take with me yet. May have to do that as I plan more boondocking in the future.
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Old 02-10-2019, 12:52 PM   #38
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For those with 24v machines who are handy enough to hook up a few wires, Amazon is full of 12v to 24v converters. Here's an example.
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