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General Discussion on any topic relating to CPAP and/or Sleep Apnea.
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yardbird
 
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how many watts does your cpap draw?

Postby yardbird on Mon Nov 28, 2005 9:21 am

Here's a device that you might want to take a look at. I'm sure there are others out there, but this one looks like it's fairly inexpensive. You could conceivably use this to determine the power requirements of your CPAP equipment in case you're trying to figure out what you'd need for battery backup.

http://www.thinkgeek.com/gadgets/electronic/7657/


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Additional Comments: original pressure 8cm - auto 8-12

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derek
 
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Postby derek on Mon Nov 28, 2005 9:30 am

I've done measurements on the REMStar Auto running on dc. It draws about 0.75 amps, which corresponds to 9 watts (12 x .75) without the humidifier. It probably draws a bit more on ac. This is about 1/6 of the power of a 60 watt light bulb!

I don't know how much the humidifier draws, but its probably 30 - 50 watts max.

The current ratings given by the manufacturers are the maximum values, and do not represent the average draw.

The point is that a cpap is not a significant energy user.


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yardbird
 
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Postby yardbird on Mon Nov 28, 2005 9:43 am

derek-

interesting... I'm seeing pure sine wave inverters going for about $60 on ebay in the 300-500watt range. That seems like it'd be plenty big enough to handle an autopap including the heater.

I'm not going to chase the battery backup thing just yet, personally. I mean if I see pieces and/or parts that I can get for a bargain I may squirrel some stuff away, but I have a 5000 watt standby generator and I'm more inclined to convert that to using natural gas, than I am to try and get set up to run my machine on battery.

_________________
Machine: S9 AutoSet™ CPAP Machine
Mask: Swift™ FX Nasal Pillow CPAP Mask with Headgear
Humidifier: S9™ Series H5i™ Heated Humidifier with Climate Control
Additional Comments: original pressure 8cm - auto 8-12

chrisp
 
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Postby chrisp on Mon Nov 28, 2005 4:23 pm

All you need to do is buy the M connecter 9$6)and a battery. Seems alot easier than running out to start that ole stinky generator @ 2 gallons an hour. And hope you dont get electrocuted or die from carbon monoxide . :shock:

:twis :twisted: ted:

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yardbird
 
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Postby yardbird on Mon Nov 28, 2005 6:41 pm

chrisp.... propane. The generator is getting converted... no bad fumes. :)
I was gonna do natural gas ..... I'm still considering that as another alternative. The natural gas stays on when the power is out and I'd never have to worry about whether the tank is getting low on propane. However propane burns ALMOST as hot as gasoline and natural gas is quite a bit cooler burning .... just not there yet. :)

I agree about the battery though. If I lost my humidifier, but kept my xPAP machine running I think that'd be fine in an emergency.


_________________
Machine: S9 AutoSet™ CPAP Machine
Mask: Swift™ FX Nasal Pillow CPAP Mask with Headgear
Humidifier: S9™ Series H5i™ Heated Humidifier with Climate Control
Additional Comments: original pressure 8cm - auto 8-12

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sthnreb
 
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Postby sthnreb on Tue Nov 29, 2005 11:30 am

I contacted Respironics about the Bipap pro 2 and they replied that it would pull about 80 watts of power.


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Additional Comments: Bipap M Auto w/Heated Intergrated Humidifier Encore Pro 1.8 Software
After 8 years I'm still working on reducing my AHI. Rx 12/8 and using a Respironics REMstar M Series Bipap Auto.

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CharlesJ
 
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Postby CharlesJ on Tue Nov 29, 2005 11:59 am

derek wrote:I've done measurements on the REMStar Auto running on dc. It draws about 0.75 amps, which corresponds to 9 watts (12 x .75) without the humidifier.


Derek >>> Kudos on your knowledge of Ohm's Law!

To be accurate, current is drawn. Power is measured in watts.

Chuck


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