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Update: I received the new charger I ordered, charged up my C-222 battery, and my test over the past few nights resulted in 27:20 hours of usage at 12cm (no ramp, no flex). The chart for my battery, which bearded_two linked to above, indicates about 13 hours of use at 12cm, so the chart is apparently very conservative in its estimates.

This test was done with the battery powering just the machine. I'll also power the integrated heated humidifier for my next test.

From what I've read it appears that there are two categories of battery being used, those that are marketed specifically for CPAP use and general use batteries (that's probably an oversimplification).

With my Resmed S8 Autoset II (no heated humidifier during battery use), one option I am considering is cpap.com's Battery Pack for S8 https://www.cpap.com/cpap-machine/cpap- ... cable.html, which includes the S8 DC-12 Converter. I would also need to purchase an adapter to be able to charge the battery from my car. I see the lithium ion battery as a plus (and the approximate 8 hr recharge time), but unfortunately, the over $300 price for the battery plus car adapter seems rather excessive.

On the other hand, I have been directed to this http://www.duracellpower.com/backup-pow ... k-600.aspx. Apparently the Autoset II can be connected to this battery using the normal AC cord, so there would not be a need to purchase the $80 Resmed DC-12 Converter. At around $140 to $150, this battery is a much less expensive solution (although the 35 hr recharge time doesn't sound very good). I also don't know how many recharge cycles I could expect with this battery.

Are there any obvious advantages of one of these type batteries over the other that I may be missing?

bcab17 wrote:With my Resmed S8 Autoset II (no heated humidifier during battery use), one option I am considering is cpap.com's Battery Pack for S8 https://www.cpap.com/cpap-machine/cpap- ... cable.html, which includes the S8 DC-12 Converter. I would also need to purchase an adapter to be able to charge the battery from my car. I see the lithium ion battery as a plus (and the approximate 8 hr recharge time), but unfortunately, the over $300 price for the battery plus car adapter seems rather excessive.

This battery cannot be charged using DC. It requires AC power for recharging.

On the other hand, I have been directed to this http://www.duracellpower.com/backup-pow ... k-600.aspx. Apparently the Autoset II can be connected to this battery using the normal AC cord, so there would not be a need to purchase the $80 Resmed DC-12 Converter. At around $140 to $150, this battery is a much less expensive solution (although the 35 hr recharge time doesn't sound very good). I also don't know how many recharge cycles I could expect with this battery.

This battery includes a modified sine wave inverter. ResMed machines require pure sine wave inverters.

I have an Owell Industries C266 battery and the ResMed converter, so I have no direct experience with either battery you mention. Mine is lithium ion and must be recharged via AC power as well. Due to the Duracell's modified sine wave inverter, it sounds like you'd still need the ResMed converter or a pure sine wave inverter.

BTW, I have an Autoset II as backup (along with ResMed DC-converter https://www.cpap.com/productpage/DC-12-Inverter.html). I just switched from CPAP to BiPAP, so my main machine is the VPAP Auto 25. It requires a different converter: https://www.cpap.com/productpage/resmed ... -vpap.html)

Complicated, isn't it?

BleepingBeauty wrote:Update: I received the new charger I ordered, charged up my C-222 battery, and my test over the past few nights resulted in 27:20 hours of usage at 12cm (no ramp, no flex). The chart for my battery, which bearded_two linked to above, indicates about 13 hours of use at 12cm, so the chart is apparently very conservative in its estimates.

This test was done with the battery powering just the machine. I'll also power the integrated heated humidifier for my next test.

Great news, BB! It'll be interesting to see how many hours you get with the humidifier.

twokatmew wrote:

bcab17 wrote:With my Resmed S8 Autoset II (no heated humidifier during battery use), one option I am considering is cpap.com's Battery Pack for S8 https://www.cpap.com/cpap-machine/cpap- ... cable.html, which includes the S8 DC-12 Converter. I would also need to purchase an adapter to be able to charge the battery from my car. I see the lithium ion battery as a plus (and the approximate 8 hr recharge time), but unfortunately, the over $300 price for the battery plus car adapter seems rather excessive.

This battery cannot be charged using DC. It requires AC power for recharging.

On the other hand, I have been directed to this http://www.duracellpower.com/backup-pow ... k-600.aspx. Apparently the Autoset II can be connected to this battery using the normal AC cord, so there would not be a need to purchase the $80 Resmed DC-12 Converter. At around $140 to $150, this battery is a much less expensive solution (although the 35 hr recharge time doesn't sound very good). I also don't know how many recharge cycles I could expect with this battery.

This battery includes a modified sine wave inverter. ResMed machines require pure sine wave inverters.

I have an Owell Industries C266 battery and the ResMed converter, so I have no direct experience with either battery you mention. Mine is lithium ion and must be recharged via AC power as well. Due to the Duracell's modified sine wave inverter, it sounds like you'd still need the ResMed converter or a pure sine wave inverter.

BTW, I have an Autoset II as backup (along with ResMed DC-converter https://www.cpap.com/productpage/DC-12-Inverter.html). I just switched from CPAP to BiPAP, so my main machine is the VPAP Auto 25. It requires a different converter: https://www.cpap.com/productpage/resmed ... -vpap.html)

Complicated, isn't it?

Wow! Thanks for the heads-up. All along I had it in my mind that the S8 Autoset II required a modified sine wave inverter.

I originally really liked the idea of a lithium ion battery, but the fact that you can only use AC to charge them just doesn't make sense to me. In the case of a power outage, what good is a battery that can only be charged with AC, which you don't have?

Running a ResMed flow generator with
humidifier:
If you wish to use a battery to run a ResMed
flow generator with the HumidiAire 2i or
HumidAire 3i, a pure sine wave inverter with a
minimum continuous power rating of 200 watts
or higher is required.

Look at page 7 of this official ResMed .PDF:

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

Yes,you CAN run your ResMed S8 from the Duracell Powerpack(modified sinewave),with NO Humidaire3i or 4i.

Since the Eliminator and Duracell units are both manufactured by Xantrex and are pretty much the same,I will run my S8 Elite II on the Motomaster Eliminator PowerBox and see how long it goes.

Cost,availability and feature set are factors,along with duration of power supply.

Yes,the S8 Elite II does work with the "modified sine wave" AC inverter and no DC ResMed accessories,I am using it that way now and will run the cpap until the PowerBox "low power"alarm sounds off...

BleepingBeauty wrote:Update: I received the new charger I ordered, charged up my C-222 battery, and my test over the past few nights resulted in 27:20 hours of usage at 12cm (no ramp, no flex). The chart for my battery, which bearded_two linked to above, indicates about 13 hours of use at 12cm, so the chart is apparently very conservative in its estimates.

This test was done with the battery powering just the machine. I'll also power the integrated heated humidifier for my next test.

Great, I am highly interested in those results..

The oure sine inverter from battery geeks looks like you could charge this battery from your cars cigarette lighter.... i need to calol to makesure of that...

I await your results..

Bumping to show my edit including another battery I just used.

Running a ResMed S8 Elite II @ 8 cmh20 & EPR 1:

Total running time with blower on was 25 hours before the PowerBox "low power alert" alarm sounded.

I will add that the first night includes 6 hours with the Humidaire H3i attatched in passover mode (not recommended),so there was a load associated with that.

Since I average a little over 6 hours of sleep per night,this backup power unit afforded me 4 nights of trouble free sleep.

Full 100% recharge was much less than stated in the manual (35 hours).
I plugged the AC charger in at 8:00 am yesterday and when I awoke today before 8:00 am it was fully charged,so it is safe to say less than 24 hours recharge time on AC.

12 V DC recharge time from a running vehicle is in the area of 4 hours,says the manual.
Using the 12 V DC outlet with a Resmed 12 V converter could give you up to 25 % more running cpap time so you possibly might have over 30 hours blower use on a single charge!

All that and you can recharge or power small devices,use the built in AM/FM radio/alarm clock or emergency lamp,plus boost you car battery.
Know your power loads before attatching them and this is an amazing unit for $139 USD.
Be sure to get the 800 amp 600 watt model.

Well, I'm bummed to report that my battery is not powering the humidifier, after all. When I push the power button on the machine, the light on the humidifier dial is steady, as usual. So I go to sleep thinking the humidifier is being heated. But upon waking, the light is blinking (indicating no heating going on), and the heating plate is cold.

So, apologies for my earlier claims of heated humidity with my battery. I guess I wasn't paying close enough attention to the blue light last year, when I first tested it.

BTW, it takes about 7 hours to fully charge the battery.

5aces wrote:

Running a ResMed S8 Elite II @ 8 cmh20 & EPR 1:

Total running time with blower on was 25 hours before the PowerBox "low power alert" alarm sounded.

I will add that the first night includes 6 hours with the Humidaire H3i attatched in passover mode (not recommended),so there was a load associated with that.

Since I average a little over 6 hours of sleep per night,this backup power unit afforded me 4 nights of trouble free sleep.

Full 100% recharge was much less than stated in the manual (35 hours).
I plugged the AC charger in at 8:00 am yesterday and when I awoke today before 8:00 am it was fully charged,so it is safe to say less than 24 hours recharge time on AC.

12 V DC recharge time from a running vehicle is in the area of 4 hours,says the manual.
Using the 12 V DC outlet with a Resmed 12 V converter could give you up to 25 % more running cpap time so you possibly might have over 30 hours blower use on a single charge!

All that and you can recharge or power small devices,use the built in AM/FM radio/alarm clock or emergency lamp,plus boost you car battery.
Know your power loads before attatching them and this is an amazing unit for $139 USD.
Be sure to get the 800 amp 600 watt model.

Great stuff, 5aces! Thank you for this info. I guess this leaves me with a few more questions:

1) When you say that using your humidifier in passover mode is "not recommended", could you please clarify that. It was my understanding that as long as no heat was being applied to the humidifier, it would be safe to use with a battery (no need for a pure sine wave inverter). Also, you mentioned that there was a load assosiated with using the humidifier in passover mode. I always assumed that using the humidifier with the control knob in the "off" position just meant that the flow generator was simply blowing air through a conatiner of water (no additional electic is being used by the humidifier). Are you saying that blowing the air through the humidifier, rather than going directly into the tube, adds a load to the battery?

2) Does using the EPR function require more electric power from the battery? My pressure setting is 10, and I use EPR set at 1.

3) Do you have any idea how many discharge/recharge cycles this battery is rated for? I couldn't find that info on the manufacturer's website.

Again, thanks so much for all your help with this!

Here is the link where we discuss why not to turn on the ResMed Humidaire without a true sine wave inverter:
viewtopic.php?f=1&t=45674&p=410212#p410212

The H3i Humidaire plugs into the S8 II Elite and even though the humidifier control switch is set to 'zero' the humidifier indicator lamp is still on,turning the control dial on could damage your unit.

A workaround could be to disconnect/unplug the Humidaire unit from the blower and run a short cpap tube between the blower and humidifier,like the stand alone Fischer/Paykel units,for passover humidification.

An increase in pressure or EPR would have a negligible impact on running hours achieved.
(as far as bcab17 running on 10 cmh20)

I telephoned Xantrex head office in Burnaby,B.C. to get this pertinent info:
1)-use the unit every 6-8 weeks,to achieve a discharge (up to 50%),then recharge for a longer life.
Use the powerpack minimum every 3 months and recharge.

2)-expect at least 200-300 'complete' discharge/recharge cyles before you have to recycle this unit,depending on your use.

3)-the unit inside is a 12 v sealed lead acid battery rated at 28 amp hr.

Sold as XPower Powerpack 600HD and Duracell Powerpack 600 in the U.S.A.
MotoMaster Eliminator PowerBox 800 in Canada.

An increase in pressure does increase the current draw. I had provided a chart earlier in this thread that could be used to extrapolate the increased current draw for an increase in pressure.

Trying to find some simple way to power my Series 234 F&P cpap machine in my recreational vehicle. Apparently this cpap machine does not have a 12 volt input but the RV does have a 400 watt inverter. I assume that if I set the humidifier (heater) to zero the RV battery life would be greatly extended. The RV has two deep cycle 12 volt batteries on board and two batteries in the tow vehicle which are continuously connected to the RV unless physically disconnected. My question is: Is it a simple matter of plugging the cpap into the 400 watt inverter? Will the inverter provide enough power for the cpap and for how long? Is there a risk of doing damage to any of the component parts?
Any and all input welcomed
5er

I have a 12 volt deep cycle marine battery bought new in May.
modified sine wave inverter, 300 bought new in May.
I do not use the humidifier
Pressure at 11
Have gone up to 3 nights at a time, about 8 hours per night.
I charged the battery when I got home with a marine battery charger.
I have used the battery 3 week ends so far.
Hope this helps with the poll.
Cheers
Norma