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Are there quite a few people running their M-Series machines on UPS'? I called Respironics to see what they'd say about non-sine wave power. Their response: "We do not recommend running any of our machines on UPS'."

Also - here's a response today from Fisher & Paykel regarding the use of an HC150 with a UPS:

"Thank you for contacting Fisher & Paykel Healthcare. Using a power
source with a stepped approximation to a sine wave should not be a
problem. However, if you want to run the humidifier off of a battery, we
usually recommend a 12 V deep-cycle battery with a minimum of 50 A and a
voltage inverter with a minimum of 200 W. A UPS is typically designed
for short-term use. The deep-cycle battery with an inverter choice would
be a better option for extended usage time."

ColinP wrote:

Goofproof wrote:Their info doesn't make any sense. if something on A/C draws draws 200 watts, the same load (WORK) would use 100 watts at 220. Them's the rules. Now if you ran a 110 volt unit on 220 volts, then it would draw more power and you would need a fire hose.

Does the constant spending of money ever slow down with cpap hardware? Yes, when we get smarter, or run out of money. Jim

Not quite. If the power supply can use anything from 110 to 240 (which is pretty standard these days) it'll use 100W not matter what the voltage. I think you're confusing watts with amps.

Not all XPAPs use a powerbrick, I don't agree. I agree it will use the same power (WATTs) after it's dropped to 12 volts d/c, the load of the XPAP stays the same. They are stating at 220 volts a/c it takes twice the wattage to make the 12volt dc, if so get out the fire hose. That extra 200 watts, has to be given off as heat. Also the cost of operation would double, it would not, the KWH would be close to the same, because a 220 volt circuit uses 1/2 the power to do the same work as a 110 volt circuit. Jim