ResMed S9 with a battery?

[Cpapfan]

Thanks to everyone who answered my questions about the S9. It arrived today. The manuals don't say anything about battery use, so I asked Cpap.com if I could used my old ResMed DC-12 converter with the S9. The answer is "no," and there is no currently available cord or adapter for the S9.

I use one of those car starter, multi-purpose batteries as a backup when we have a power outage. It really extends the life of the charge to bypass the AC inverter and plug directly into the DC outlet. Oh, well, maybe they will produce one soon.

[Zzz_Jim]

I asked Resmed about battery operation of the S9, since the S9 isn't listed in their battery applications document. And actually got an answer.

"You can use the same criteria as the S8s. That is for use WITH the humidifier, you need a pure-sine wave inverter 300 watts or higher.
If used without the humidifier (only the S9), you could use a modified sine-wave humidifier of 150 watts or higher."

Unfortunately, using an inverter followed by an AC adapter is a very inefficient way to run things, as there is a loss in both the inverter and AC adapter. If they are both 80% efficient then one is throwing out 36% of the battery: 80% x 80% = 64%. Means one needs a really big battery. If one occasionally need to use a battery looks like the Respironics units are handier, but nowhere near as good as an AIOMED Everest.

Anyone know what the output is on the S9 AC adapter? That would tell us if there might be an easy way to kludge up a cable adapter. If it says something like "12V 5A" like on my Respironics AC adapter, then its easy. If 24V then I'd have to make a special converter.

[billbolton]

Unfortunately, using an inverter followed by an AC adapter is a very inefficient way to run things

With contemporay inverter and switch mode power supply technologies, it is, at worst, mildly inefficient.

If they are both 80% efficient then one is throwing out 36% of the battery: 80% x 80% = 64%.

If they are both ~95% efficient....... ~95% x ~95% = ~90%

Anyone know what the output is on the S9 AC adapter?

It's 24Volts DC, at 90W max energy output level, so about 3.75A current, with a 3 pin connector to the flow generator.

There is going to be a 30W power supply available (within a few months I'm told) for running just the flow generator without a humdifier.

Cheers,

Bill

[Mile]

Hello everyone,

I plan to go camping next week so I need a 12V DC/DC converter. I measured the voltage on the 3 Pins of the connector the small one is 3,25V one of the bigger ones is GND and the other 24,2V. So I searched for the connector and finally found it at some electronic online shop. By the way its called "MDP-401-3P". Now I bought one Laptop Caradapter supplying 24V till 4Amps and another caradapter for camcorder or cell supplying 3 and 3,3 Volts till 2Amps. Today I combined those two in one housing and so on, it took me about 4 hours of work. The bad thing is that the S9 somehow recognizes that there is something different and writes a message, that I should connect the Powersupply correctly, no matther if i put the small one to 3V or 3,3V. But with the AC converter it still wors fine.
I even can start the flow for a couple of seconds but than it stops, displaying this message.
Has anybody an idea what the reason for this could be? Is the small connector some type of a bus connector sending messages? Are they really that crazy?

Cheers, Michael

[billbolton]

I measured the voltage on the 3 Pins of the connector the small one is 3,25V one of the bigger ones is GND and the other 24,2V.

Keep in mine that you are measuring no-load voltages by that method.

It's possible that the pin on which you measured the ~3.25 V level is not an output voltage line to the flow generator, but is instead a return signal line of some sort, providing some feedback function between the S9 and the power adapter (perhaps related to whether a Humidifer or Climateline hose is connected or not).

You may just be measuring the floating bias voltage on the input sensor in the power adapter for that line.

Cheers,

Bill

[billbolton]

I contacted Resmed SleepVantage Support with several questions about battery operation yesterday, and received this prompt reply.

• Q1. When will the 30W mains power adapter for the S9 become available?
  
  A1. YES, P/N 36920, RRP AUD $29.95, should be available now but isn't, am trying to get an indication of its ETA from marketing so will advise you when I have this information.
  
  Q2. Will there be any way to use an S9 from a battery power source, without using an inverter to provide mains voltage power to run the S9 power adapter?
  
  A2. YES, a special converter is due approx July/August time-frame, can’t advise P/N or price at this stage. It will connect directly into the rear of the S9 and will not need to be used in conjunction with the 90 Watt PSU as is the case at present if you use an inverter. It will power both the S9 and the H5i if required.
  
  Q3. Will there be an advisory note on running S9s from battery power, similar to the one provided for earlier Resmed flow generators.... particularly I'm looking for the information on energy usage at various titration settings?
  
  A3. YES, a new version of the Battery Guide is being drafted which will include the relevant information for the S9 product.

Cheers,

Bill

[JohnBFisher]

In this instance, I recommend the use of a battery and an inverter - without the heated part of the humidifier. It will work well.

Using anything other than the ResMed part will invalidate the warranty. It's really a lot cheaper / easier to use a modified sine wave inverter.

[nittalagh]

Just thought you'd all like to know that the battery guide has now been updated for the S9. http://www.resmed.com/us/assets/documen ... lo_eng.pdf
Looks like even the humidifier can be run off a modified sine wave inverter.

[sk8rs_dad]

A2. YES, a special converter is due approx July/August time-frame, can’t advise P/N or price at this stage. It will connect directly into the rear of the S9 and will not need to be used in conjunction with the 90 Watt PSU as is the case at present if you use an inverter. It will power both the S9 and the H5i if required.

Is there any update on the availability of the DC-DC converter for the S9. I am off on a week long backpacking trip at the end of the month and would prefer this to using the inverter option.

[liv2kite]

I contacted Resmed SleepVantage Support with several questions about battery operation yesterday, and received this prompt reply.

• Q1. When will the 30W mains power adapter for the S9 become available?
  
  A1. YES, P/N 36920, RRP AUD $29.95, should be available now but isn't, am trying to get an indication of its ETA from marketing so will advise you when I have this information.
  
  Q2. Will there be any way to use an S9 from a battery power source, without using an inverter to provide mains voltage power to run the S9 power adapter?
  
  A2. YES, a special converter is due approx July/August time-frame, can’t advise P/N or price at this stage. It will connect directly into the rear of the S9 and will not need to be used in conjunction with the 90 Watt PSU as is the case at present if you use an inverter. It will power both the S9 and the H5i if required.
  
  Q3. Will there be an advisory note on running S9s from battery power, similar to the one provided for earlier Resmed flow generators.... particularly I'm looking for the information on energy usage at various titration settings?
  
  A3. YES, a new version of the Battery Guide is being drafted which will include the relevant information for the S9 product.

Cheers,

Bill

1. Is the 30W power adapter available in US (does https://www.cpap.com have it). I wonder how much it costs and if P/N 36920 works in US also.
2. What source do people recommend for the hypoallergenic filters ? (I believe CPAP.com has their own ? or is it advisable to buy ResMed brand ?

I'll have my S9 soon and am leaving on a trip in 2 weeks.

[billbolton]

Is there any update on the availability of the DC-DC converter for the S9.

I followed up on my earlier email exchange with Resmed....

Sorry Bill but the S9 converter has slipped now until September

Cheers,

Bill

[cronoclone]

I'm a new CPAP user, starting out with the S9. It's been great so far, but I travel a lot and it's kind of turning my life upside down that I can't take it anywhere with me. I've tried trolling forums, but I just get confused with power converters and inverters and the like, and what batteries they won't cause to explode in the middle of the night. I was wondering if anyone has had success getting an S9 to work with a battery pack, and if so, could they tell me how they did it? I just can't figure out what I need to buy.

[topdragster]

You only need the convertable plugs for the country you are visiting. The s9 power supply input is for use with 110volts up to 240 volts. Here is a link to the different plugs and voltages in different countries.

http://www.travel-images.com/electric-plugs.html

here is a link to the samsonite travel converter/adapter kit that would be all you need as its rated at 1600 watts and the s9 with humidifier is a total of 180 watts. It would be alot less to pack than a battery pak.

http://www.amazon.com/Samsonite-Convert ... hisProduct


below is the specs for the s9 90watt power supply, you will notice the input range is from 110v to 250v this means with the correct plug adapter you can use it in any country. The other option is to use a travel converter that will step the power down to 110v form 240v if required.

90W power supply

* unit Input range 100-240V, 50-60Hz,
* Nominal for aircraft use 110V, 400Hz
* Typical power consumption 70W (80VA)
* Maximum power consumption 110W (120VA)

Data Storage Capacity

* Display: 365 days summary data (up to 500 events per session.)
* SD Memory Card: 365 days summary data and 30 Days and 7 nights detailed data

Aircraft use

These S9 devices comply with US FFC Part 15, Class B requirements if no external data cables are used.

Hope this helps

[billbolton]

I just can't figure out what I need to buy.

See http://www.resmed.com/au/assets/documen ... lo_eng.pdf

Cheers,

Bill

[sk8rs_dad]

I am very disappointed with Resmed for not providing a dc-to-dc converter. I have a 14.4V lithium-ion battery that worked fine for my previous CPAP that I cannot use with an inverter, or at least any inverter I have managed to find. It's no-load voltage is 16.3 volts which all the inverters I have found reject as too high. If I could get n inverter to start with it, the voltage would immediately drop to 14.4V which is with the standard operating tolerances of any of them. Any advice?