Uninterruptible Power Supply for S9

We had a power failure last evening, and I stayed up late until it came back on to make I used my CPAP. Ended up not getting enough sleep. So I'm looking for a UPS.

I checked out CPAP.COM but none of the their UPS or batteries include the S9 Resmed. They do list the S8, however. I called the CPAP.COM folks and asked them about the S9, but they say they don't have ANY UPS devices for the S9. They state the manufacturer hasn't come out with anything yet. She didn't seem very interested in helping me after that.

So, before I try and deal with the Resmed folks, has anyone out there used an UPS with the S9? If so, what is it and where can I get one? I don't know why I can't just use a regular UPS from Best Buy or somewhere like that. But I don't want one that will alarm when the power goes out.

Thanks!

Just search on this site for "battery backup". LOTS of help there.

Thanks for the links. I looked, but didn't find much that addressed the S9.

I did venture into the Resmed web site and found a FAQ on using batteries! However, I came away confused after reading the PDF file. Apparently, there are some major power differences between the S8 and the S9. From what I can tell, the S8 requires a pure sine wave DC to AC conversion to get it to work. But I found a table that listed the S8 as working with a modified sine wave inverter. And it's not clear that even with a pure sine wave inverter that the humidifiers for the S8 will also work. One part of the PDF implies it will, another that it won't.

For the S9, the information appears to indicate that a modified sine inverter will suffice to operate both the S9 and a H5i humidifier. You can find it in a couple of spots in the PDF. But theres also a big warning on one page not to use "humidifiers" with a modified sine wave inverter. That generic reference scares me.

Anyway, I have a question in to the Resmed folks asking for some clarification. Since i already have a 600 watt modified sine wave inverter with an AC plug in, I'm hoping that it and a battery is all I need. And a charger, I guess.

When I get the reply, I'll post it.

ANY UPS that will work on a laptop computer, will work with your S9. The caveat about not using one on the heated humidifier is because the heater draws so much power, nothing to do with the inverter. Also, be aware that a pure sine wave inverter draws much more power from a battery, than does a MSW inverter. I use a 2KW MSW all the time and never had a problem with my Respironics, however I recently re-wired the bedroom and have a power point for straight 12V operation now.

karl9000 wrote:Thanks for the links. I looked, but didn't find much that addressed the S9.

The S9 + H5i is straightforward to run off a Modified Sine Wave inverter without any problems, so that is why there is a lot less said about it than their earlier systems, which required pure sinewave AC for the humidifer.

If you have an S9, you don't need to be concerned about the S8 information, so just ignore it.

Resmed is due to release a DC battery power adapter for the S9 in September. This date has already slipped a month or two from the original advice on availability, so whether it will appear in September is anyone's guess!

Cheers,

Bill

Tex,

What I hate about UPS is their capacity and cost. I don't need multiple plug-ins, and I definitely don't need an alarm to tell me the power is out. Kind of defeats the purpose...

I could probably find one with the capacity and without the alarm, but again, the cost. Most of the computer ones, even at 2kw, aren't meant to last more than 2 hours or so. A lot are less than that. According to the Resmed specs, with the S9, 5Hi, and Climateline with my worst case settings, I need a 50-60 amp battery through a 200 watt inverter to power it all for 8 hours with a 50% margin on the battery. I don't think I can get a UPS with that capacity cheap.

But I do have the 600 watt inverter, a battery should be less that $100, and another $30 for the charger and I'm good to go. It should cost less than buying an UPS of similar capacity. If I fry the machine, I'll let you know...

Bill,

Thanks, that's pretty much what I finally figured out. I'm a retired, anal retentive engineer and I hate it when manuals conflict.

Figures that Resmed is late. But since I AM a retired engineer, guess I throw together my own system.

Let's see, the box to hold it; gotta make it look good to keep the wife happy...

Don't forget that patent application....

A MARINE/rv DEEP CYCLE BATTERY AND A 400WATT INVERTER WILL GET YOU THROUGH A NIGHT OR 2
sorry about the cap not sure what happen there

If you are using batteries, doesn't in make more sense (and less expense) to power the xPAP with DC?

Unlike the S8 that runs on 12V DC (blower only -- not the humidifier), I believe the the S9 blower and humidifier will run on 24V DC.

karl9000 wrote:We had a power failure last evening, and I stayed up late until it came back on to make I used my CPAP. Ended up not getting enough sleep. So I'm looking for a UPS.

I checked out CPAP.COM but none of the their UPS or batteries include the S9 Resmed. They do list the S8, however. I called the CPAP.COM folks and asked them about the S9, but they say they don't have ANY UPS devices for the S9. They state the manufacturer hasn't come out with anything yet. She didn't seem very interested in helping me after that.

So, before I try and deal with the Resmed folks, has anyone out there used an UPS with the S9? If so, what is it and where can I get one? I don't know why I can't just use a regular UPS from Best Buy or somewhere like that. But I don't want one that will alarm when the power goes out.

Thanks!

ResMed does not build UPS devices for their devices. They post the following battery guide on ResMed.com, but it also applies to UPS power supplies. Anything that meets the written requirements will work fine. This document can be confusing, but they have to be specific on the power requirements in order to make sure the device is properly powered and therapy is not compromised.

http://www.resmed.com/us/assets/documen ... lo_eng.pdf

There are also 3rd party manufacturers who provide battery systems such as http://www.batterypowersolutions.net

I have 300 modified sine wave inverter, 12 volt deep cycle marine battery and have made it for 3 nights in my motorhome.......turned OFF the humidifier, only used it in passover mode.
Good luck
Nan

nanwilson wrote:..turned OFF the humidifier, only used it in passover mode.
Good luck
Nan

See, there's the part that scared me, I called Resmed (you may have different equipment) and their tech support people told me that the humidifier could not even be attached to an S7 in order to use a msw inverter, even if the humidifier was set to zero. It didn't make any sense to me but, I dropped approx. $150 on a Xantrex 600 watt pure sine wave inverter from a popular online auction site. Kind of pricey but, I figured it was better than burning up some expensive piece of CPAP stuff and it did allow me to run the humidifier on a setting of 2 with a large marine battery for 2 nights before needing a re-charge.

I recently got an S9 and am waiting for the DC kit to come out as the sine wave inverter is only about 87% efficient and I would just as soon run straight from a battery. Definitely need some kind of back up since I absolutely CAN NOT sleep with out CPAP.

yawnny wrote:told me that the humidifier could not even be attached to an S7 in order to use a msw inverter, even if the humidifier was set to zero. It didn't make any sense to me...

The Resmed heated humidifiers up to and including the H4i use a phase control-like approach for setting the heating level. This requires true sine wave AC power to work correctly. The Modified Sine Wave inverters produce what is pretty much a square wave with the corners of the top of the square 'rounded off' a little..... this renders phase control approaches useless, and eventually damages the electronic componentry of the phase control system.

The H5i humidifier uses DC power, provided by the switch mode power supply in the S9, to do the heating. Its a completely different technology approach to the earlier Resmed humidifiers and side steps the need for true sine wave AC power.

Cheers,

Bill