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My battery backup setup
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sdb7802 Offline

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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: #231
RE: My battery backup setup
(08-19-2016 01:08 AM)Marthajoy7 Wrote:  In regards to oscope display.
If I am reading the scope correctly? The sense line resting voltage seems to be almost 13volts.
During power up, your lable of 1.8volts to me looks like 6 volts on the scope. Also it looks like when data is going on it is almost going to ground.

The trace is the only one I kept while working on this about six months ago.

The blue trace is 2 volts per major division. What I labelled as 3 volts is actually 3.3 volts. The horizontal dashed white line is the ground reference for the blue trace. Also, the 1.8 volt pulldown value is probably a little off.

I used the 1.8 volt value to try to illustrate what Dave was describing about the sense line activity.

I'll post some more traces later.

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.
08-19-2016 10:19 AM
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ve7ltd Offline

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Posts: 10
Joined: Jun 2016

Machine: AirSense S10
Mask Type: Nasal mask
Mask Make & Model: F&P Eson
Humidifier: AirSense S10
CPAP Pressure: 6-15
CPAP Software: Not using software

Other Comments:

Sex: Male
Location: Canada

Post: #232
RE: My battery backup setup
Once the S10/A10 unit has booted with the sense line connected, I believe you can disconnect the sense line and it continues to work. So I can confirm 100% that the unit will not run on anything under about 20-22V. This is consistent with all the findings I have seen. The sense line is only used by the machine on initial boot, then it starts to send some sort of data. So even if I ground or disconnect the sense pin, as long as the machine is booted it seems to keep working. So the shutdown has nothing to do with the voltage on the sense pin AFTER boot.

Martha, Perchas is mentioning that I am the creator of the IRLP system which he has used to communicate around the world. Small world.

On another note - i fell asleep without my machine last night, and today i feel like crap.... I can't seem to function at work. Maybe I'll go home and have a CPAP-nap and recharge. Wink

Dave
08-19-2016 11:00 AM
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Marthajoy7 Offline

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Posts: 67
Joined: Jun 2015

Machine: aircurve 10 auto set to bipap S mode
Mask Type: Full face mask
Mask Make & Model: resmed mirage full face or Clear view full mask
Humidifier: Resmed built in humidifier
CPAP Pressure: 18.4/12 clearview or 18/13 mir
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Female
Location: Seattle

Post: #233
RE: My battery backup setup
Wow; I am impressed. I used to do more with electronics but with my health and memory loss, I have a hard time just trying to care for myself. Tremors on both arms and legs makes soldering a challenge. So if I can find premade modules, that is so much easier for me these days. I remember back as a kid, using ww2 govt surplus eqp converted to amateur radio. Had a neighbor ham operator whom gave me my first test.

I really hope you take care of yourself. Get some quality sleep as soon as you can. I am retired/disabled so I sleep anytime I feel the need.

Really interested in idea that the pin can disconnect after operation is started.
maybe a momentary switch on startup. Turn off auto-sense to make sure unit does not shut down from mask leakage. Or maybe something more elaborate. Sense line on 24v line. If current is not flowing pin is connected, when current flows, pin connection is open. anyway just ideas. Just wondering if change in data voltage levels affects data being recorded on sd card.
(This post was last modified: 08-19-2016 02:56 PM by Marthajoy7.)
08-19-2016 02:45 PM
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ve7ltd Offline

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Posts: 10
Joined: Jun 2016

Machine: AirSense S10
Mask Type: Nasal mask
Mask Make & Model: F&P Eson
Humidifier: AirSense S10
CPAP Pressure: 6-15
CPAP Software: Not using software

Other Comments:

Sex: Male
Location: Canada

Post: #234
RE: My battery backup setup
There is no need to disconnect the sense line - I was just saying that it would not cause the machine to shut down from a low voltage on the sense pin. I will get my setup out of my trailer this weekend (stored at another location), and take some pictures and play around a bit more.

When I found the 47k value, I had just received the DC-DC converter unit in the mail, and I had 2 hours to make a working setup before I sent on a 10 day camping trip. I have a 1500 true sine wave inverter, but it sucks a lot of extra power, so I wanted to make this solution work.

I need to clean up the cabling a bit. I may also just make a spare and build a battery backed up DC floating backup and take lots of pictures. That way others can build the same thing and hopefully have the same success as I have.

I made a post in the UPS backup thread earlier today where I outlined my ultimate bedside setup using an AGM 12V battery, 12-24 DC-DC converter unit, 47k ohm sense pin cable, and a smart charger to make a 2-3 day on backup system that required no intervention if the power cut off or turned back on.

This is the DC-DC unit I bought: [link removed]

Dave

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(This post was last modified: 08-19-2016 03:18 PM by ve7ltd.)
08-19-2016 03:15 PM
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Sleepster Offline
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Machine: ResMed AirCurve10 VAuto
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
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CPAP Pressure: MaxI 13.6 | MinE 5.2 | PS 4.4
CPAP Software: ResScan SleepyHead

Other Comments: Diagnosed Nov 2011. Conquered aerophagia.

Sex: Male
Location: Houston, Texas

Post: #235
RE: My battery backup setup
(08-16-2016 09:42 PM)OMyMyOHellYes Wrote:  I will keep using my PR System 1s that don't need no stinkin' third line! Just a plain battery that I know how to run.

Me, too. It's my back up machine for use during extended outages. If we ever have one. Oops! I just tempted fate!

Sleepster
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08-20-2016 04:24 AM
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Marthajoy7 Offline

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Machine: aircurve 10 auto set to bipap S mode
Mask Type: Full face mask
Mask Make & Model: resmed mirage full face or Clear view full mask
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CPAP Pressure: 18.4/12 clearview or 18/13 mir
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Sex: Female
Location: Seattle

Post: #236
RE: My battery backup setup
That is fine, but I need a Bipap. Insurance is renting me an AirCurve 10, and they do not care what happens to me if power goes out! But I do.
08-20-2016 03:58 PM
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Sleeprider Online
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Machine: Resmed Aircurve 10 Vauto
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Sex: Male
Location: Where they make Respironics

Post: #237
RE: My battery backup setup
MJ, the PRS1 60 Series BiPAP Auto would give the same therapy at 12 watts. You might be able to find one at a pretty low cost. I have one.

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08-20-2016 06:27 PM
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Marthajoy7 Offline

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Posts: 67
Joined: Jun 2015

Machine: aircurve 10 auto set to bipap S mode
Mask Type: Full face mask
Mask Make & Model: resmed mirage full face or Clear view full mask
Humidifier: Resmed built in humidifier
CPAP Pressure: 18.4/12 clearview or 18/13 mir
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Female
Location: Seattle

Post: #238
RE: My battery backup setup
I have parts on the way to be able to power Resmed AirCurve 10 Vpap from strictly battery power. No inverter needed. Told I will probably draw 8-10 watts/hr id humidity and heated tubing is not used. Most my batteries are 24ah to 40ah in size. 2 - 40ah batteries in series has almost 200 watts of power. That would equate to about 20 hrs of operation per battery charge. I have a number of 24v chargers from my mobility devices. I could even run setup as a UPS. Charger to batteries to device, if power goes out, batteries supply power, if AC comes back on, charger auto recharges batteries. Not as expensive as paying over $700 for a refurbished backup machine.
We just needed to figure out what it was that Resmed did to make is so they thought, only they could provide power for the machines.
I am considering using 47k ohm resistor to center pin only on power-up. That would cut down battery drain slightly and not mess with data stream voltage levels. Which may be why Resmed is using 3.3v converters.
I will get there, and much thanks to these wonderful engineers helping us.
08-20-2016 09:24 PM
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Marthajoy7 Offline

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Posts: 67
Joined: Jun 2015

Machine: aircurve 10 auto set to bipap S mode
Mask Type: Full face mask
Mask Make & Model: resmed mirage full face or Clear view full mask
Humidifier: Resmed built in humidifier
CPAP Pressure: 18.4/12 clearview or 18/13 mir
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Female
Location: Seattle

Post: #239
RE: My battery backup setup
Wow, I really messed up on my est. power. 24 x 40 is about 960 not 200w
So at 10 watts/hr that would be 96 hours.
But I want to power 2 machines off one set so probably around 48 hours for 2 machines.
Parts starting to come in now, So over the next week or so
(This post was last modified: 08-21-2016 04:08 AM by Marthajoy7.)
08-21-2016 04:06 AM
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Perchas Offline

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Machine: Philips DreamStation A-CPAP
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CPAP Software: SleepyHead

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Sex: Male
Location: Madrid & Phoenix

Post: #240
RE: My battery backup setup
(08-19-2016 03:15 PM)ve7ltd Wrote:  This is the DC-DC unit I bought: [link removed]

Dave

Is this ?, search on eBay "DC Converter 240W DC 12V to 24V 10A" barato, barato $ 28,00.

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08-21-2016 08:04 AM
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