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[Equipment] Portable generator to power S9
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Ghost1958 Offline

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Posts: 957
Joined: Aug 2014

Machine: PRS1 Series Sixty Auto Aflex
Mask Type: Nasal mask
Mask Make & Model: F&P Eson
Humidifier: PRS1 with Heated Hose
CPAP Pressure: 10.5 min 16 max
CPAP Software: SleepyHead EncoreBasic

Other Comments: Moderate to Severe SA Obstructive. Rapid O2 desat off the machine.

Sex: Male
Location: KY

Post: #11
RE: Portable generator to power S9
Hummm im not sure if a Cpap machine power brick is different than a computer one in what it takes but we have ran laptops off generators on ac for all kinds of things for a week at a time.

But if the Generator wont do the trick then I guess its two car batteries, a battery charger AND a small generator for the wife and me this winter. Our power outages are for days not hours out here where we live. Reckon if the generator cant be used to run the pap machines off of then itll have to power a battery charger to recharge the two car batteries everyday till the outage is over.

Still dont see why everything else electrical from PCs to toasters tvs etc can be run off the AC side of a generator but a cpap cant. But im no electician either
09-05-2014 10:28 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: #12
RE: Portable generator to power S9
(09-05-2014 09:29 AM)o2meister Wrote:  Can you use a portable generator to power an S9? I called ResMed technical support and they told me that you could NOT. Not sure if they just wanted to sell me a battery!

How much gas do it use and how much you got on hand? If there is a power outage of any duration and/or large geographic area, local sources of gasoline are going to be dead in the water too since gas pumps run off electric. They may have full underground tanks, but no way to get it into your car or cans.

Growing up in the country, we had a few widespread power outages of several days duration. I plan on having two weeks of reserve battery capacity for CPAP and a means to recharge the batts off grid.

OMM
09-05-2014 10:41 PM
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woozie38 Offline

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Posts: 248
Joined: Jan 2013

Machine: Fisher & Paykel Icon + Auto
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: Integral
CPAP Pressure: 8 to 14
CPAP Software: SleepyHead Other Software

Other Comments: 17 years of CPAP + supp. oxygen @ 3 L/min

Sex: Male
Location: Toowoomba, Queensland Australia

Post: #13
RE: Portable generator to power S9
(09-05-2014 10:28 PM)Ghost1958 Wrote:  Hummm im not sure if a Cpap machine power brick is different than a computer one in what it takes but we have ran laptops off generators on ac for all kinds of things for a week at a time.

But if the Generator wont do the trick then I guess its two car batteries, a battery charger AND a small generator for the wife and me this winter. Our power outages are for days not hours out here where we live. Reckon if the generator cant be used to run the pap machines off of then itll have to power a battery charger to recharge the two car batteries everyday till the outage is over.

Still dont see why everything else electrical from PCs to toasters tvs etc can be run off the AC side of a generator but a cpap cant. But im no electrician either
I understand your problem. Use your generator to charge the batteries. A standard 12V battery is around 80~100 ampere hours. About 70% of which is available for use & a CPAP machine uses approx. 50 Watts or draws about 4 amps at 12V, without the humidifier, which means such a battery theoretically would power your machine for about 16hrs. I use a 150 A/hr AGM battery which is kept charged by the AC grid in conjunction with a 300W pure sine wave inverter. During a power outage this lasts up to 4 nights. PS. laptop computers run off their batteries and don't have a large power transformer. The problem is caused by a phenomenon known as hysteresis factor. Any appliance that has a large power transformer is in great danger when used on the uncertain power from a portable generator. The gear may well work for a while, but only until the transformer windings heat up, short and burn. At this point the rest of the circuitry is in jeopardy. I have burnt out a couple of transformers in this way.

[Image: signature.png]Keep on breathin'
09-05-2014 11:05 PM
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Galactus Offline

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Posts: 1,388
Joined: Jan 2014

Machine: Phillips Respironics System One PRS1 DS760P Auto BiPAP
Mask Type: Nasal pillows
Mask Make & Model: ResMed Airfit P10 Nasal Pillow
Humidifier: System One Heated Humidifier + Climate Line
CPAP Pressure: E/I 13/20 PS 4/7 BiFlex 3
CPAP Software: SleepyHead EncoreBasic

Other Comments: Sleep can be a good thing.

Sex: Male
Location: USA

Post: #14
RE: Portable generator to power S9
I don't want to get into a large argument over this but the fact is that the AC Adapter used on my CPAP machine is an exact copy of the AC Adapter used on many notebook computers nothing more and nothing less even manufactured by Astec a large supplier of AC Adapters for many computers. Further NB computers run off the power supply just as well as off their batteries. If you remove the battery and run the NB off the AC Adapter it runs just fine off a generator, as we do many times here in the winter when the power goes out. We also run our air compressors, air tools, and the whole rest of the house off backup generators, as well as a few different outside shops, some with direct hook up generators others with outside smaller units. If you are truly worried about the CPAP unit add a low end small UPS between the AC Adapter and the generator outlet, it will clean any possible power issues in the line.

If everyone thinks alike, then someone isn't thinking.
Everyone knows something, together we could know everything.
09-05-2014 11:27 PM
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woozie38 Offline

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Posts: 248
Joined: Jan 2013

Machine: Fisher & Paykel Icon + Auto
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: Integral
CPAP Pressure: 8 to 14
CPAP Software: SleepyHead Other Software

Other Comments: 17 years of CPAP + supp. oxygen @ 3 L/min

Sex: Male
Location: Toowoomba, Queensland Australia

Post: #15
RE: Portable generator to power S9
(09-05-2014 11:27 PM)Galactus Wrote:  I don't want to get into a large argument over this but the fact is that the AC Adapter used on my CPAP machine is an exact copy of the AC Adapter used on many notebook computers nothing more and nothing less even manufactured by Astec a large supplier of AC Adapters for many computers. Further NB computers run off the power supply just as well as off their batteries. If you remove the battery and run the NB off the AC Adapter it runs just fine off a generator, as we do many times here in the winter when the power goes out. We also run our air compressors, air tools, and the whole rest of the house off backup generators, as well as a few different outside shops, some with direct hook up generators others with outside smaller units. If you are truly worried about the CPAP unit add a low end small UPS between the AC Adapter and the generator outlet, it will clean any possible power issues in the line.
Yes you are correct Galactus. It's only the equipment that run on low voltage broken down by a power transformer that risks damage from generator output. Especially if it's a multi tap transformer. As you say, power tools, refrigerators. washing machines & the like all run fine.

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09-05-2014 11:45 PM
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Skypilot Offline

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Posts: 96
Joined: Jun 2014

Machine: ResMed Hire
Mask Type: Nasal pillows
Mask Make & Model: AIRFITâ„¢ P10 nasal pilow
Humidifier: H5i Humidifier
CPAP Pressure: Doc said to try 12; was 14
CPAP Software: ResScan SleepyHead

Other Comments: The land of Nod is but a dream.

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Location: Canberra, Australia

Post: #16
RE: Portable generator to power S9
(09-05-2014 07:40 PM)woozie38 Wrote:  
(09-05-2014 09:29 AM)o2meister Wrote:  Can you use a portable generator to power an S9? I called ResMed technical support and they told me that you could NOT. Not sure if they just wanted to sell me a battery!
The short answer is NO you can't, but it depends on the generator. If your generator has permanent magnets instead of field coils, its a good chance it will produce suitable power. However most generators produce a sort of modified sine wave which is not suitable and will cause heat to build up in the power transformer of the PAP machine's power supply.The transformer will burn out. Any device equipped with a power transformer requires a pure sine wave power source. The alternative as you've been advised is to use an accumulator (battery), which is probably best anyway.

The power bricks that come with the CPAP machines do not use transformers - they are switch mode power supplies - no transformer.

Switch mode is much more efficient than a transformer and allows the the wide voltage range of 115 - 240 - you can't do that with a transformer; you would have to move a switch to use different tappings on the transformer.
09-06-2014 01:31 AM
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woozie38 Offline

Advisory Members

Posts: 248
Joined: Jan 2013

Machine: Fisher & Paykel Icon + Auto
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: Integral
CPAP Pressure: 8 to 14
CPAP Software: SleepyHead Other Software

Other Comments: 17 years of CPAP + supp. oxygen @ 3 L/min

Sex: Male
Location: Toowoomba, Queensland Australia

Post: #17
RE: Portable generator to power S9
Quote:The power bricks that come with the CPAP machines do not use transformers - they are switch mode power supplies - no transformer.
True. Can you tell if switch mode power supplies can handle the rough power from a portable genset?

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09-06-2014 03:46 AM
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Doc J Offline

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Posts: 199
Joined: Dec 2013

Machine: ResMed S9 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed AirFit P10
Humidifier: resMed H5i Dumped and dry daily
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CPAP Software: ResScan SleepyHead

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Sex: Male
Location: Central Nebraska

Post: #18
RE: Portable generator to power S9
There is still a transformer in a switch mode power supply, it is much smaller and lighter and works at high frequency. Just get an extra power supply brick and roll the dice and find out in real time. It will probably work and you can adapt if the first one blows up.

Good Luck!

Doc J (despite my nickname I am not a doctor)

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09-06-2014 10:19 AM
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Galactus Offline

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Posts: 1,388
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Machine: Phillips Respironics System One PRS1 DS760P Auto BiPAP
Mask Type: Nasal pillows
Mask Make & Model: ResMed Airfit P10 Nasal Pillow
Humidifier: System One Heated Humidifier + Climate Line
CPAP Pressure: E/I 13/20 PS 4/7 BiFlex 3
CPAP Software: SleepyHead EncoreBasic

Other Comments: Sleep can be a good thing.

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Post: #19
RE: Portable generator to power S9
It was late, I was tired, skypilot said what I meant lol. And DocJ added the correction. I was trying to say they are small supplies with small transformers and switchable supplies like our NB computers and are able to be run off generators. Add to that for about $25-$50 you can just add a UPS in the line to protect a computer or cpap supply from having an issue. Or as DocJ says have an extra supply on hand. One other thing to note if using it on a generator would be do not start the genny with the supply plugged in, start it, and then plug in the load. Also do not allow the genny to run out of fuel with the load plugged in. Both these points, startup, and shut down are when the voltages will vary and stability will be at issue and when devices are at risk the most, goes for all devices as well.

If everyone thinks alike, then someone isn't thinking.
Everyone knows something, together we could know everything.
09-06-2014 10:44 AM
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Ghost1958 Offline

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Posts: 957
Joined: Aug 2014

Machine: PRS1 Series Sixty Auto Aflex
Mask Type: Nasal mask
Mask Make & Model: F&P Eson
Humidifier: PRS1 with Heated Hose
CPAP Pressure: 10.5 min 16 max
CPAP Software: SleepyHead EncoreBasic

Other Comments: Moderate to Severe SA Obstructive. Rapid O2 desat off the machine.

Sex: Male
Location: KY

Post: #20
RE: Portable generator to power S9
Ok being stupid Ill try to figure this out with some help please since there are conflicting posts about it.
Short term outage is not what I need to deal with for two machines. A week to four weeks is possible. Doesnt happen that long often but it has more than once due to ice taking down power lines and trees. I can store gas for that long in 5 gal cans with stabil.
Which I would do because several times even getting out of here in a full size 4 wheel drive or a atv has been iffy to impossible due to downed trees.

Now if im reading this right If I get a small generator, and a surge protector, plug the cpaps into the surge protector I would be ok???
Assuming a small generator will run two Apaps with heated humidifiers?? I heat with wood so that isnt a problem. Dont care about running anything else but the Apaps at night.

But I do need to figure this out before weather gets nasty. On a fixed income and cant really afford to spend money this way then that way to try set up a long term power solution that will work without wrecking the machines.
09-06-2014 01:11 PM
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