Deep cycle battery???

[builta]

I have 3 group 27 deep cycle batteries (for our fifth wheel trailer). As I understand it, I need the 12 volt cigarette adapter for my
cpap machine and also the alligator clip connector for the 12 volt adapter to plug into?
Is this correct? If so, where is the best deal for these?

I'd check auto parts stores, Walmart, Marine stores, etc. I used to see them around all the time. The CPAP sellers seem to price them rather high. Actually, I need to go find an adapter like this myself, although I know I've got some somewhere.

Archangle, PR S1 Humidifiers are 12 volt. I've used one on battery already. Cheers P.S. you can probably buy a R3 M series humidifier and tank on line at an auction site for under 50 bucks (lots cheeper then a new xPAP..

Lars, Why don't you just wire up (or have your RV Dealer do it to be safe) a 12 volt female plug next to your bed in the 5th wheel trailer. That way you are always ready to go. That is what I did. The all you do is connect the 12 volt cord to the machine and plug it in and your sleep'n! I'd put one (or have the RV Dealer do it) on both sides of the bed (but that's just me).
Arrr!
Cheers.

[builta]

You know I am sure that yo are right. It will depend on the Rev level of the integrated humidifier. If you get a Rev 3 humidifier then you don't need to do anything besides plug the 12 volt into the humidifier and then connect the little patch cord from the humidifier into the blower. The 120 volt humidifiers come with a little cap that you have to plug into the power brick and it has a cord to plug into the humidifier (and no patch cord on the humidifier to plug into the blower.)

Both my M-Series humidifiers are rev 3. They are definitely 12 volt humidifiers--I've used both directly from 12 volt (same with the PRS1 humidifiers8-12 volt.) I don't know exactly when they changed to the 12 volt humidifier but I know Rev 3 is 12 volt.

Am I correct that you have a Rev 1 or 2 humidifier? (it has a water tank with both of the littler rubber connector next to each other -for Rev 3 the two rubber connectors are off set by about 2 inches) See this link for visual of Rev 1, 2 &3 tanks. https://www.cpap.com/productpage/Respir ... amber.html

If you camp and have an M-Series, then I'd suggest that search the auction sites or Craig's list for a 12 volt one (until you find one at a great price).

Cheers

Thanks, I never had any idea there were different revs on the humidifier. I'm sure mine is one of the older virgins that's 115V only.

Do you know if the PR System One humidifiers run on 12V?

Hi archangle,

Here is a M-Series R3 humidifier for auction on e-Bay (currently 10.50 ends at 9:11 PDT 04/26/11) You can tell that it is R3 type because of the little line under the number "5". Cannot tell if it has a water tank with it or not.

http://cgi.ebay.com/Respironics-1051158 ... 3882650243

Cheers

[archangle]

Thanks. It says it's a chamber, the picture is a humidifier. I notice a lot of the ebay listings show things like a whole cpap machine, but it's actually just filters and says so in the listings. If it doesn't have a chamber, I'll have to get one of them. I think I need an a "Y" DC power cord that this one may not have, the price is now $25+ and $9 shipping. It's unknown if it's working.

The model number is one that is under a recall.

http://www.mhra.gov.uk/home/idcplg?IdcS ... stReleased

I also wonder if my "non-humidifier" power supply will power the humidifier.

I do appreciate the hint, builta. It just doesn't look that good after some digging. However, while browsing through the ebay listings, I may see some other supplies I want, such as some mask cushions.

I am looking forward to finding a DC humidifier now that I know one exists for my machine. Or simply a PR Series One Auto with humidifier. Then I can waste a lot of time looking through the waveform data the Series One records that the M series doesn't.

[nanwilson]

Can you give us any info about the particular marine battery and inverter, Nan?[/quote]
Archangle:
It's a Motomaster Nautilus 12v 740A and the inverter is also Motomaster, Eliminator 300watt.
480 wattt of surge power and 240 watt of continuous power.
I don't use my M series with this, I use the F&P 604 when camping. My M series is for home use.

Nan

[lars4life]

.

[builta]

builta,
I have only one 12 volt outlet in the 5th wheel and it's in the living room in the wall behind the TV. What a drag. I guess
if I need to, I could sleep on the foldout couch in the living room. Otherwise, I'd need a 15 foot 12 volt cord.

Hi,

Take your rig to your dealer and they can install another 12 volt outlet where ever you want one. (I suggest next to your night stand by your bed.

I did it myself and it cost me all of 10 bucks and about 30 minutes of time (dealer probably 10X my cost.)

Cheers.

[tron]

I screwed up..

I have 2 different cpap machines that use the same 12v barrel connector for 12v power.. looks like I plugged in the wrong one to my s8 and now it is completely dead.

I am considering opening up the unit and repairing, and at same time installing a bridge rectifier so it will NOt need the factory power adapter. Does anyone have any experience with working on their S8 ? Has anyone tried to modify the 12v side of the unit?

(I only use the S8 for travel and was checking it out in preperation for a extended trip that would require 12v power at times)

tron

[archangle]

I screwed up..

I have 2 different cpap machines that use the same 12v barrel connector for 12v power.. looks like I plugged in the wrong one to my s8 and now it is completely dead.

I am considering opening up the unit and repairing, and at same time installing a bridge rectifier so it will NOt need the factory power adapter. Does anyone have any experience with working on their S8 ? Has anyone tried to modify the 12v side of the unit?

(I only use the S8 for travel and was checking it out in preperation for a extended trip that would require 12v power at times)

tron

What's the difference between the S8 DC power requirement and the other devices that use the same plug? Polarity reversed, AC/DC, different voltage, or what? I see that the S8 supposedly requires some sort of external converter to work off 12V DC.

[billbolton]

What's the difference between the S8 DC power requirement and the other devices that use the same plug?

The use across the whole spectrum of electronic equipment that uses the type of low voltage DC barrel connectors of the type used on Resmed S8 machines, the split is about 50/50 on whether the centre connection is "+" or "-". There is simply no hard and fast standard for how they should be wired.

On a Resmed S8 the center connection is "-" and the outer connection is "+". On a Respironics machines the center connection is "+" and the outer connection is "-".

I see that the S8 supposedly requires some sort of external converter to work off 12V DC.

Resmed made a DC-12 adapter which provided a DC output with a centre connector "-", as well as supporting 12V or 24V DC input, complete isloation between the input and output sides of the adapter, noise filtering, and a low voltage cut out so that the battery wouldn't be too deeply discharged. It was a device intended to make Battery powering as foolproof as possible for users who know nothing about electrical systems.

It is possible to run an S8 straight off a 12V DC battery without a DC-12, for those who have a resonably good understanding of low voltage DC power systems. If you go back far enough through the battery powering threads here you'll find some discussion on how to do it.

Cheers,

Bill

[tron]

We will crack the s8 tomorrow - I am guessing that the reverse polarity occurance opened a diode that - hopefully - will be a simple replacement. I also look to install a bridge rectifier so that it can handle either + or - on the center pin..

[lars4life]

.

[archangle]

We will crack the s8 tomorrow - I am guessing that the reverse polarity occurance opened a diode that - hopefully - will be a simple replacement. I also look to install a bridge rectifier so that it can handle either + or - on the center pin..

The bridge rectifier will drop the voltage by around 1.4 V. Doesn't sound like much, but it is 10% of the total voltage.

I hope they designed the machine to blow a fuse when it gets reverse polarity.

You might consider putting a different plug on the DC connection, perhaps even a pigtail that hangs out the back so you can't plug the other DC adapter into it.

[lars4life]

.

[archangle]

Look what I found out about DC and Respironics machines....

The Respironics DC Cord can be used to operate Respironics’ CPAP Systems where AC is not available. It plugs into a
standard cigarette lighter socket found in automotive vehicles.
If you frequently operate your Respironics System using DC power, have your home care provider set your prescribed
pressure while the unit is operating on DC power. There may be a slight (less than 0.5 cm H2O) drop in pressure when
the unit is switched from AC power operation to DC power operation.
WARNING: This cord will allow all of the Respironics CPAP Systems to function throughout their entire
pressure ranges except for the REMstar® Systems. This DC power cord can only be used with the
REMstar Systems for pressures of 11 cm H2O or lower.

....Pressures of 11 or lower (my pressure of 20 counts me out)

Memo to Philips/Respironics:

NICE JOB, MORONS!!!

Here's what I THINK they mean. The manuals on the PR web site are such a disgrace that I may be wrong.

"REMstar" means legacy REMstar machine. Not even legacy REMstar Plus, Pro, or Auto machine. Not M Series or System One.

See these two PDF files:

http://global.respironics.com/ServiceMa ... Cables.pdf

Part number 1001956 DC power cord
http://global.respironics.com/UserGuide ... DCCord.pdf

The first manual indicates that the 11 cm is a factor for legacy REMstar (non-plus, non-pro, non-Auto) models. Even the legacy REMstar machine works above 11, but it draws more current.

If you read the second manual, it indicates that the DC power is a different beast for legacy REMstar plus/pro/auto vs. legacy REMstar.

The manuals both appear to be written before the M-series came out, and were not updated on the Respironics web site despite the fact that these are the parts for the M Series that has been released and obsoleted . Can I say again, NICE JOB, MORONS!!!

The M series REMstar Auto manual http://global.respironics.com/UserGuide ... esAuto.pdf seems to indicate to use the 1001956 cable without any restrictions.

I believe the BiPAP legacy (pre-M series) machines require 24 volts and a DC-DC converter. (EDITED to correct from "M-series" to "pre-M series)

PR hides the user manual for System One machines, so I don't have documentation on them.

CPAP.com has their take on what this cord works with here:

https://www.cpap.com/productpage/respir ... -cord.html

cpap.com doesn't specifically say the 1001956 cable cable works with System One, but the links on the System One machine listings imply it does.