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DC for Resmed S8
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Breathetonight Offline

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Posts: 14
Joined: Jan 2015

Machine: resmed 10
Mask Type: Nasal pillows
Mask Make & Model: Respironics
Humidifier: Resmed
CPAP Pressure: 7
CPAP Software: SleepyHead

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Sex: Male
Location: Northern edge of Wisconsin

Post: #1
DC for Resmed S8
I'm looking at a Resmed S8 as a camping Cpap to runoff a deep cycle battery. I found a little used S9 but Resmed does not support the unit any more and I haven't been able to find a Resmed DC power connection kit anywhere online. Does any one here have any suggestions?

Thanks
02-01-2015 06:39 PM
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archangle Offline
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Advisory Members

Posts: 3,159
Joined: Feb 2012

Machine: ResMed S9 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed Swift FX
Humidifier: ResMed S9 H5i
CPAP Pressure: 16-20
CPAP Software: ResScan SleepyHead EncoreBasic

Other Comments: Happy PAPper

Sex: Undisclosed
Location: USA

Post: #2
RE: DC for Resmed S8
Supplier #1 sells the ridiculously overpriced ResMed DC converters for S8, S8 VPAP, S9, and A10 machines. I suspect other online suppliers do as well.

At least they list them on their web sites. Have you called and found they aren't available?

I know S9 machines are booby trapped to not work without the ResMed adapters even if you get the right voltages. I'm not sure S8 machines will run off of 12V directly or not. ResMed has dire warnings that you need the ridiculously overpriced ResMed DC-DC converter for the S8 machines.

I do recall hearing that S8 and Respironics machines use the same DC plug but opposite polarities.

If you use a DC-AC inverter, don't use the it with the S8 machine, or it may damage the humidifier. S9 machines work OK with inverters.

Get the free SleepyHead software here.
Useful links.
Click here for information on the main alternative to CPAP.
If it's midnight and a DME tells you it's dark outside, go and check it yourself.
02-01-2015 08:26 PM
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vsheline Offline

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Posts: 1,908
Joined: Jul 2012

Machine: S9 VPAP Adapt (USA Model# 36007, not better 36037 or 36067)
Mask Type: Full face mask
Mask Make & Model: F10 or SimPlus w/ 2Liners. MirageQuatro & Gecko gel pad
Humidifier: H5i
CPAP Pressure: 15 EPAP, PS 5-10
CPAP Software: ResScan

Other Comments: Marfan Syndrome, chronic bradycardia, occasional Cheyne-Stokes Respiration

Sex: Male
Location: California, USA

Post: #3
RE: DC for Resmed S8
(02-01-2015 06:39 PM)Breathetonight Wrote:  I'm looking at a Resmed S8 as a camping Cpap to runoff a deep cycle battery. I found a little used S9 but Resmed does not support the unit any more and I haven't been able to find a Resmed DC power connection kit anywhere online.

Do you mean you found a little-used S8?

I think it is important to use the proper DC-DC converter to replace the machine's normal 115VAC Power Adapter, because using an inverter to produce 115VAC (to use the normal AC Power Adapter) would be much less efficient, requiring perhaps 40% or 50% greater reserve capacity in the deep discharge battery, which would cost more to get a bigger and heavier battery or would cost in terms of allowing less run time before the battery would become discharged.

Prices for used S9 machines are becoming more affordable these days. (For example, from Supplier #2 on the Supplier List.)

Membership in the Advisory Member group should not be understood as in any way implying medical expertise or qualification for advising Sleep Apnea patients concerning their treatment. The Advisory Member group provides advice and suggestions to Apnea Board administrators and staff on matters concerning Apnea Board operation and administrative policies - not on matters concerning treatment for Sleep Apnea. I think it is now too late to change the name of the group but I think Voting Member group would perhaps have been a more descriptive name for the group.
(This post was last modified: 02-01-2015 08:54 PM by vsheline.)
02-01-2015 08:43 PM
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justMongo Offline

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Posts: 3,854
Joined: Sep 2013

Machine: ResMed VPAP Auto (S9)
Mask Type: Full face mask
Mask Make & Model: ResMed Mirage Quattro
Humidifier: ResMed H5i
CPAP Pressure: 18 IPAPmax - 11 EPAPmin, PS=5
CPAP Software: Other Software

Other Comments: μολὼν λαβέ

Sex: Male
Location: Калифорния

Post: #4
RE: DC for Resmed S8
ResMed S8 blower unit is rated at 24VDC at 2.5 Amperes. I think it actually draws a bit less current.

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.
02-01-2015 09:02 PM
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OMyMyOHellYes Offline

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Posts: 915
Joined: Mar 2013

Machine: Respironics 560 Auto
Mask Type: Nasal mask
Mask Make & Model: Resmed Mirage FX
Humidifier: Respironics System One (no heated hose)
CPAP Pressure: 08.0-15.0 cm/H2O
CPAP Software: EncoreBasic

Other Comments:

Sex: Male
Location: Texas

Post: #5
RE: DC for Resmed S8
(02-01-2015 09:02 PM)justMongo Wrote:  ResMed S8 blower unit is rated at 24VDC at 2.5 Amperes. I think it actually draws a bit less current.

I know the S9 is a 24 volt blower. I was under the impression that the S8 was a 12V system? Just wired backwards?

VERIFY EVERYTHING I SAY HERE BEFORE ACTING ON IT OR PROCEED AT YOUR OWN PERIL. It has been a long time since I messed with any S8 equipment and i have not had the opportunity to sleep at a Holiday Inn Express since then... In any case, the sneaky boogers at Resmend wired the DC plug backwards so nobody else's plug would work. IIRC it is center pin negative, outer jacket positive. So if you make your own plug, verify that .... And verify it before using somebody else's dc cord. Also IIRC the S8 used a 25 mm plug, but I could be wrong on that. As I said, it's been a couple years since my S8 died and went under that great slow recycling mountain on the southern edge of town.

OMM
(This post was last modified: 02-02-2015 05:08 AM by OMyMyOHellYes.)
02-01-2015 09:22 PM
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justMongo Offline

Monitors

Posts: 3,854
Joined: Sep 2013

Machine: ResMed VPAP Auto (S9)
Mask Type: Full face mask
Mask Make & Model: ResMed Mirage Quattro
Humidifier: ResMed H5i
CPAP Pressure: 18 IPAPmax - 11 EPAPmin, PS=5
CPAP Software: Other Software

Other Comments: μολὼν λαβέ

Sex: Male
Location: Калифорния

Post: #6
RE: DC for Resmed S8
Bottom view of S8 blower unit. Power requirements photo, left.
(400 Hz is for aircraft use.)
[Image: 13SEPT2013%20004.jpg]

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.
02-01-2015 09:56 PM
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archangle Offline
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Advisory Members

Posts: 3,159
Joined: Feb 2012

Machine: ResMed S9 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed Swift FX
Humidifier: ResMed S9 H5i
CPAP Pressure: 16-20
CPAP Software: ResScan SleepyHead EncoreBasic

Other Comments: Happy PAPper

Sex: Undisclosed
Location: USA

Post: #7
RE: DC for Resmed S8
(02-01-2015 09:02 PM)justMongo Wrote:  ResMed S8 blower unit is rated at 24VDC at 2.5 Amperes. I think it actually draws a bit less current.

In general, S8 VPAP machines are 24V, CPAP/APAP are 12V.

I'm not sure of the exact model numbers for each voltage.

Mongo have VPAP S. Mongo only pawn in game of life.

Get the free SleepyHead software here.
Useful links.
Click here for information on the main alternative to CPAP.
If it's midnight and a DME tells you it's dark outside, go and check it yourself.
02-01-2015 10:24 PM
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truckerdad57 Offline

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Posts: 36
Joined: May 2012

Machine: tester - lots
Mask Type: Nasal pillows
Mask Make & Model: tester lots
Humidifier: ResMed S-9 climateline
CPAP Pressure: APAP 15-17
CPAP Software: SleepyHead

Other Comments: Truck driver active on issues with apnea and DOT medical exams.

Sex: Male
Location: Batavia, Il

Post: #8
RE: DC for Resmed S8
The old s8 cpap apap needs a pure sine wave inverter. Using a normal modified sine wave inverters will over time burn out the blower motor and compliance electronics.

I ran an s8 on a pure sine wave inverer in the truck for years with no problems.

The s9. has a direct 12v power supply. That saves on battery drain.

Running anything off 12 battery via inverter will result in significant power loss through the inverter. This power loss gets really bad if you're using the inverter near it's wattage limits..

Most cpap at max pressure and max humidification draw. 185 watt 110v AC power . Plan on using a 400 watt inverter directly wired to battery. Use good heavy gauge cable from the inverter to battery. Light cable will mess up battery drain by overheating.

That's standard practice for cpap used by truckers in sleeper berth equipped semi trucks.


If you're looking for a camping setup look at the Transcend or z1 portable devices.

I've got a transcend as a backup. It's designed for minimal battery drain. But no humidification.

Check the CPAP review forum on transcend or z1.

(Just a truck driver with sleep apnea )
02-04-2015 04:26 AM
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archangle Offline
Wiki Editor
Advisory Members

Posts: 3,159
Joined: Feb 2012

Machine: ResMed S9 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed Swift FX
Humidifier: ResMed S9 H5i
CPAP Pressure: 16-20
CPAP Software: ResScan SleepyHead EncoreBasic

Other Comments: Happy PAPper

Sex: Undisclosed
Location: USA

Post: #9
RE: DC for Resmed S8
(02-04-2015 04:26 AM)truckerdad57 Wrote:  The old s8 cpap apap needs a pure sine wave inverter. Using a normal modified sine wave inverters will over time burn out the blower motor and compliance electronics.

Not according to ResMed. All the S8 machines are specified to run on MSW inverters as long as you remove the humidifier.

http://www.resmed.com/us/dam/documents/a...lo_eng.pdf

Get the free SleepyHead software here.
Useful links.
Click here for information on the main alternative to CPAP.
If it's midnight and a DME tells you it's dark outside, go and check it yourself.
02-04-2015 04:48 AM
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archangle Offline
Wiki Editor
Advisory Members

Posts: 3,159
Joined: Feb 2012

Machine: ResMed S9 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed Swift FX
Humidifier: ResMed S9 H5i
CPAP Pressure: 16-20
CPAP Software: ResScan SleepyHead EncoreBasic

Other Comments: Happy PAPper

Sex: Undisclosed
Location: USA

Post: #10
RE: DC for Resmed S8
(02-04-2015 04:26 AM)truckerdad57 Wrote:  Most cpap at max pressure and max humidification draw. 185 watt 110v AC power . Plan on using a 400 watt inverter directly wired to battery. Use good heavy gauge cable from the inverter to battery. Light cable will mess up battery drain by overheating.

Your number is too high. My S9 with pressure of 16 and humidification at 5 draws about 30 watts average on the AC power line. Measured with a Kill-a-watt device.

Check the ResMed PDF document for numbers for many operating conditions.

http://www.resmed.com/us/dam/documents/a...lo_eng.pdf

Get the free SleepyHead software here.
Useful links.
Click here for information on the main alternative to CPAP.
If it's midnight and a DME tells you it's dark outside, go and check it yourself.
02-04-2015 04:59 AM
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