C-Pap power usage
So, I have been using my 12v(6.6 amps) C-Pap machine for a few years in my Creek Side. Now..........my wife is using a C-Pap. So far I have had my wife use my home unit(same exact one as in the trai...
Forum Discussion
JimK-NY wrote:JFNM wrote:
Most likely. Most CPAP/BiPAP machines consume around 1 amp @ 12VDC,
per hour, without humidifier.
Voltage is a very poor indicator of battery state of charge. A good battery monitor will tell you what is going on.
I did a lot of research and could not find any ResMed units under 3 amps even without a humidifier. I sure would like to know which models only pull about 1 amp.
I have a resmed airsense 10. I can run it for two and half nights, sometimes 3 off a 200WH Lithium Ion battery with it in airplane mode, humidifier off, and hose heater off.
Assuming I draw the battery down to near 0, possible with a Lithium ion, 24 hours works out to about 2A average draw or less, depending on how far the battery really gets drained. More likely average draw is in the 1.5A range or less, that is using a 12 to 24V DC to DC converter with it's losses.
earlier, I goofed and said 1A, brain fart in mental calculations, but the 1A number is probably closer to reality than the mental 2A calculation assuming 100 percent battery discharge. The CPAP will shut off when battery voltage gets below a certain voltage, likely well above full discharge.
Be carefull about mfg ratings. the current draw will be the max current draw for a given configuration. current draw is highest at startup as it ramps up the blower etc. until it senses you are sleeping. And it also will likely assume max pressure, and max air volume.
So each user is likely to experience different average power draw.
