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Home Battery questions - smart chargers and standby switching?
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archangle Offline
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Advisory Members

Posts: 3,159
Joined: Feb 2012

Machine: ResMed S9 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed Swift FX
Humidifier: ResMed S9 H5i
CPAP Pressure: 16-20
CPAP Software: ResScan SleepyHead EncoreBasic

Other Comments: Happy PAPper

Sex: Undisclosed
Location: USA

Post: #11
RE: Home Battery questions - smart chargers and standby switching?
As to using a commercial UPS, they may not power your CPAP for very long, but they will get you through many outages. You can calculate the run time for many of them, but the manufacturers are not very good about giving you meaningful run time information, especially when running a low power load like a CPAP.

Many of them have audio alarms that will warn you that power is off. Some can be set up to turn off the alarm. I'm not sure if there are ones that will only turn on the alarm whenl the battery gets low.

Some UPS's and inverters put out a "modified sine wave" or "stepped approximation to sine wave." These terms are deceptive. They're more of a modified square wave than a modified sine wave.

Last time I looked, the ResMed S9 machines said modified sine wave (MSW) was OK, but don't say whether it's OK for the A10 machines. I've never been able to find Philips Respironics documentation that says yes or no for MSW.

It's probably OK, but I'm not sure.

More and more modern devices have problems working with MSW voltage from UPS's or inverters due to ill advised nanny state regulations about power factor correction.

BTW, if you want to test whether your CPAP will work with a UPS, you need to unplug the AC cord from the wall. Most UPS's are "standby" mode and just connect the output to the AC from the wall unless the wall power is off.

There are "pure sine wave" inverters/UPS's that put out a more normal voltage waveform, but they cost more money, and I suspect they're less efficient, especially at low power drains.

Get the free SleepyHead software here.
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Click here for information on the main alternative to CPAP.
If it's midnight and a DME tells you it's dark outside, go and check it yourself.
04-03-2016 04:03 PM
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sdb7802 Offline

Advisory Members

Posts: 199
Joined: Jan 2016

Machine: PR DreamStation Auto
Mask Type: Nasal pillows
Mask Make & Model: ResMed AirFit P10
Humidifier: built-in with heated hose
CPAP Pressure: 9.5-14 C-Flex 3
CPAP Software: SleepyHead

Other Comments: Retired Electrical Engineer; began using cpap in 2001; FlashAir wifi card and FlashPAP app

Sex: Male
Location: Georgia, USA (The Margravate of Azilia)

Post: #12
RE: Home Battery questions - smart chargers and standby switching?
Carbon,

What kind of run times are you getting with your PowerStation II?

Just my personal opinion. My posts are not medical advice or a statement of fact. Please consult a qualified physician or other qualified medical personnel. Please comply with all applicable laws, codes, regulations, and protocols.
04-04-2016 06:02 PM
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Carbon Offline

Preferred Members

Posts: 53
Joined: Feb 2016

Machine: Resmed Airsense 10
Mask Type: Nasal pillows
Mask Make & Model: Resmed Airfit P10
Humidifier: Resmed
CPAP Pressure: 10-13
CPAP Software: SleepyHead

Other Comments: EPR 3cm, Autoramp from 8cm

Sex: Male
Location: Australia

Post: #13
RE: Home Battery questions - smart chargers and standby switching?
I haven't actually used it yet for more than 20 minutes sdb (a short blackout). It is supposed to run at least 8 hours with no humidifier, and a couple hours with.
04-05-2016 06:57 AM
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