The total cpap experience continues: Camping

Here's the ResMed Battery Guide: http://www.resmed.com/us/documents/battery-guide.pdf

Although it only goes mentions up to the H3i humidifier, I think it's safe to apply that info to the H4i. They won't run on 12 V DC.

And not that ResMed recommends using their DC to DC converter to protect the xPAP from things like low voltage and reversed polarity.

Looks like there are two options:

From the Resmed site.

Requirements for ResMed humidifiers
For use with the HumidAire 2i or HumidAire 3i, a pure sine wave inverter with a minimum continuous power rating
of 200 watts or higher is required - refer to the table below.

Inverter:
If no AC power is available, your device can operate with DC power and an appropriate inverter. With the use of a suitable inverter, your PAP device can operate from a battery supply (e.g. in a truck or recreational vehicle).

The inverter should be capable of supplying appropriate voltage and should be of sufficient capacity. If you do not have a humidifier attached, you will need an inverter with a continuous power rating of 150W. If you are using a HumidAire H2i or H3i humidifier with your PAP device, you will need an inverter with a continuous power rating of 200W, pure sine wave.

Converter:
Using a converter to power your CPAP
Several S8 CPAP devices have a 12 volt DC power input which enable them to run from a 12 volt or 24 volt battery
using a ResMed converter, P/N 33942.
• This converter is more efficient than an inverter.
• The converter provides electrical protection to the cpap device in the event that the adapter leads are connected
incorrectly to the battery.
• The converter provides regulation of the battery voltage: a fully charged battery has a terminal voltage of 13.5
volts and will reduce as the battery is discharged.
• The converter will shutdown automatically when the voltage drops below 10.5 volts for a 12 volt battery, or 21
volts for a 24 volt battery. This will protect the battery from damage due to being allowed to fully discharge.
• The converter provides electrical isolation to the CPAP device.

Looks like you can not run the HH w/the DC/converter option.
The converter has the DC plug to fit the adpt. on the machine.
Is anyone using the converter option?

carbonman wrote:Looks like you can not run the HH w/the DC/converter option.
The converter has the DC plug to fit the adpt. on the machine.
Is anyone using the converter option?

I got the converter and this battery: http://www.bestcpapprice.com/Owell-Indu ... 0-516.html
The battery is tiny! Build quality seems really good, and it comes in a nice, small carry bag. It charged completely in about four hours, though it's supposed to take longer. (I assume it was partially charged when I got it.) I was told to simply turn the HH off when I use it, but I haven't tried yet. I'm still struggling to find the right pressure, and I seem to need an HH setting of 2. I plan to try the battery after I get the pressure question answered.

One thing i thought about is warming a little water on a fuel stove burner, pouring it into the water chamber and having pass over humidification without the need to power up the heated humidifier. Should that not be a solution? just a guess.

carbonman wrote:Looks like there are two options:

From the Resmed site.

Requirements for ResMed humidifiers
For use with the HumidAire 2i or HumidAire 3i, a pure sine wave inverter with a minimum continuous power rating
of 200 watts or higher is required - refer to the table below.

Inverter:
If no AC power is available, your device can operate with DC power and an appropriate inverter. With the use of a suitable inverter, your PAP device can operate from a battery supply (e.g. in a truck or recreational vehicle).

The inverter should be capable of supplying appropriate voltage and should be of sufficient capacity. If you do not have a humidifier attached, you will need an inverter with a continuous power rating of 150W. If you are using a HumidAire H2i or H3i humidifier with your PAP device, you will need an inverter with a continuous power rating of 200W, pure sine wave.

Converter:
Using a converter to power your CPAP
Several S8 CPAP devices have a 12 volt DC power input which enable them to run from a 12 volt or 24 volt battery
using a ResMed converter, P/N 33942.
• This converter is more efficient than an inverter.
• The converter provides electrical protection to the cpap device in the event that the adapter leads are connected
incorrectly to the battery.
• The converter provides regulation of the battery voltage: a fully charged battery has a terminal voltage of 13.5
volts and will reduce as the battery is discharged.
• The converter will shutdown automatically when the voltage drops below 10.5 volts for a 12 volt battery, or 21
volts for a 24 volt battery. This will protect the battery from damage due to being allowed to fully discharge.
• The converter provides electrical isolation to the CPAP device.

Looks like you can not run the HH w/the DC/converter option.
The converter has the DC plug to fit the adpt. on the machine.
Is anyone using the converter option?

I think that if you skip the "Heated humidifier" you are good to go with just a decent 12 volt battery and the right connection. You can use your humidifier in a "passover setup" and make it much longer on the battery. Using a heated humidifier, and in your case a sine wave inverter will just eat the life out of the battery. As long as your blower is 12 volt capable--Happy Hiking! (and post the photos)

Seriously, the heated humidifier will more then cut in half the "run time" for the battery. So, Resmed or Respironics or any other go with passover mode and enjoy more nights in the bush or a lighter battery to lug.

Marine / RV batteries are designed to be run down to nothing, with no damage (car batteries don't like when that happens). Commonly used for electric trolling motors when fishing, or in pop-up campers to run the lights and maybe the gas heater.

You can buy them at Walmart in the automotive dept. There are different sizes, and naturally the larger ones hold a charge longer. They look just like car batteries. They're 12V.

builta wrote: Seriously, the heated humidifier will more then cut in half the "run time" for the battery. So, Resmed or Respironics or any other go with passover mode and enjoy more nights in the bush or a lighter battery to lug.

Geez, I hate it when practicality gets in the way of getting toys.

......BUT, you're right.


......now go to your room.

Carbonman -

I use a rubbermaid box (camped in several deluges) - don't usually cover the top - but when I looked at your pictures a thought came to my head. Hole in the side for the hose, would need some ventilation holes, but with the lid on there should have enough insulation to use Georgio's hand warmer trick to warm the air for cold weather camping. I still don't think I'd want to do hard core Poler Bear, but I think it would make those late fall early spring trips more comfortable

Pineapple wrote: I use a rubbermaid box (camped in several deluges) - don't usually cover the top - but when I looked at your pictures a thought came to my head. Hole in the side for the hose, would need some ventilation holes, but with the lid on there should have enough insulation to use Georgio's hand warmer trick to warm the air for cold weather camping. but I think it would make those late fall early spring trips more comfortable

I like the rubbermaid box idea.
I missed the hand warmer trick.
The only hand warmers I know of run on butane.....
don't think I would want to be breathing that.

I love the total irony of using a Resmed box
to quiet an Mseries machine.

My S8 box is standing on its side between my bed and nightstand. Makes a great stand for my machine.