Post Reply 
Running on LiIon Batteries?
Author Message
lmoretti Offline

Preferred Members

Posts: 75
Joined: May 2015

Machine: PR System One 60 with AFlex
Mask Type: Nasal pillows
Mask Make & Model: Resmed P10
Humidifier: PR
CPAP Pressure: 9
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location:

Post: #1
Running on LiIon Batteries?
Anyone have a good idea about how much power a PR Systems One draws without the humidifier or a heated tube? I've got some nice 18v LiIon drill batteries and some friends who are Electrical Engineers, and was thinking about trying to make a portable power pack from them for camping instead of spending $300+ on a 3rd party premade pack.
06-03-2015 02:05 PM
Find all posts by this user Post Reply Quote this message in a reply

Donate to Apnea Board
GWild Offline

Preferred Members

Posts: 88
Joined: May 2014

Machine: RemStar Sys1 560P
Mask Type: Nasal mask
Mask Make & Model: Ultra Mirage
Humidifier: Sys1
CPAP Pressure: 8 - 20 auto / 8.9 avg
CPAP Software: SleepyHead EncoreBasic

Other Comments:

Sex: Undisclosed
Location:

Post: #2
RE: Running on LiIon Batteries?
More work than it's worth... and a waste of time, too. Typical tool packs are about 2AH... just enough for a short nap. Buy a $50 battery, do a direct connect that doesn't require finicky LiIon chargers, and have a night or two in reserve. Spend $75 and you'll get three to four nights. $400 will get a DIY nearly two weeks online - longer if you don't mind a bit more maintenance.
06-03-2015 02:36 PM
Find all posts by this user Post Reply Quote this message in a reply
OMyMyOHellYes Offline

Advisory Members

Posts: 915
Joined: Mar 2013

Machine: Respironics 560 Auto
Mask Type: Nasal mask
Mask Make & Model: Resmed Mirage FX
Humidifier: Respironics System One (no heated hose)
CPAP Pressure: 08.0-15.0 cm/H2O
CPAP Software: EncoreBasic

Other Comments:

Sex: Male
Location: Texas

Post: #3
RE: Running on LiIon Batteries?
The PR System ONe Auto (560) draws about 0.3 amps for me at an average of 9cm pressure with no heated humidifier. I can get a week or more off of a 35 AH battery.

There are some newer LiFePO4 deep cycle batteries out there now that are 9-10 AH that are laughably light weight and are fit into the same size case as a 7 AH SLA battery. I would expect, at my pressures, of getting at least two nights out of them, conservatively. I would seriously consider those if I was going camping. Even better if you have a source to charge them in the day.

LiFePO4 is Lithium IRON Phosphate - not what you typically see as "Lithium Ion".

If you want a direct reference, send me a PM.

OMMOHY
06-03-2015 07:10 PM
Find all posts by this user Post Reply Quote this message in a reply

Donate to Apnea Board
lmoretti Offline

Preferred Members

Posts: 75
Joined: May 2015

Machine: PR System One 60 with AFlex
Mask Type: Nasal pillows
Mask Make & Model: Resmed P10
Humidifier: PR
CPAP Pressure: 9
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location:

Post: #4
RE: Running on LiIon Batteries?
Thanks OMyMyOHellYes.

I looked at the power supply, and it's rated at 60 watts (for both the humidifier and PAP unit.) That translates into 0.5 Amps. I'm guessing your draw numbers are right then, as the heater in the humidifier must be a fairly serious draw.

That means for a weekend camping trip I'd need at least 5AH (0.3A * 8hrs * 2 nights = 4.8AH), probably closer to the 10AH you state for safety. It seems that the battery pack ratings aren't straight forward though, so 10AH LiFePO4 battery pack may not actually have 10AH of energy in it, but provide an equivalent cranking power as a 10AH lead acid, which doesn't mean jack in my application.

If I can find a way to charge (solar panel?) it might be able to make a longer trip.
(06-03-2015 02:36 PM)GWild Wrote:  Buy a $50 battery, do a direct connect

A standard size battery isn't going to fit in my Kayak.
(This post was last modified: 06-04-2015 10:12 AM by lmoretti.)
06-04-2015 10:10 AM
Find all posts by this user Post Reply Quote this message in a reply
GWild Offline

Preferred Members

Posts: 88
Joined: May 2014

Machine: RemStar Sys1 560P
Mask Type: Nasal mask
Mask Make & Model: Ultra Mirage
Humidifier: Sys1
CPAP Pressure: 8 - 20 auto / 8.9 avg
CPAP Software: SleepyHead EncoreBasic

Other Comments:

Sex: Undisclosed
Location:

Post: #5
RE: Running on LiIon Batteries?
I just looked at one of these in a 100AH capacity. Only $1,000.00. If the sales/marketing claim is true, 2000 80% cycles at 100A, they'd be pretty amazing. Still looking for a real spec sheet though... until I see that info, everything else is smoke and mirrors.

Wow - I found one, 12V 26AH ... and I am impressed ... but dubious:
   
(This post was last modified: 06-04-2015 01:22 PM by GWild.)
06-04-2015 01:14 PM
Find all posts by this user Post Reply Quote this message in a reply

Donate to Apnea Board
OMyMyOHellYes Offline

Advisory Members

Posts: 915
Joined: Mar 2013

Machine: Respironics 560 Auto
Mask Type: Nasal mask
Mask Make & Model: Resmed Mirage FX
Humidifier: Respironics System One (no heated hose)
CPAP Pressure: 08.0-15.0 cm/H2O
CPAP Software: EncoreBasic

Other Comments:

Sex: Male
Location: Texas

Post: #6
RE: Running on LiIon Batteries?
No, do not confuse the LiFePO4 starting batteries with the LiFePO4 deep cycle batteries. Two different things. The starting batteries as you say are not for crap for this purpose. if it has an "AH equivalent/PB equivalent" rating, move on - it's a starting battery. Googleate "LiFePO4 deep cycle battery" and "LiFePO4 SLA equivalent" to find what I'm talking about. The ones I found that were recommended were by CTC or K2 Energy.

OMMOHY
06-04-2015 02:55 PM
Find all posts by this user Post Reply Quote this message in a reply
GWild Offline

Preferred Members

Posts: 88
Joined: May 2014

Machine: RemStar Sys1 560P
Mask Type: Nasal mask
Mask Make & Model: Ultra Mirage
Humidifier: Sys1
CPAP Pressure: 8 - 20 auto / 8.9 avg
CPAP Software: SleepyHead EncoreBasic

Other Comments:

Sex: Undisclosed
Location:

Post: #7
RE: Running on LiIon Batteries?
I did do that - the curve above is for an extended use battery - and a 100% discharge at 1750 cycles with 80% capacity remaining is fundamentally awesome.

I did find a few more references, and if similar designed batteries are held to 30% DoD, the expectation is over 8,000 cycles. Those plots didn't say whether end of life was 80% or the more common 60% of original capacity... either case is good news. Now if they could just get the costs down.

As an aside, I found a 20AH battery with charger for $225. A 30AH for a bit more. Weights of 8 pounds for the larger. So there's hope these will become mainstream.

ps: I am dubious on the 0.3 amp number. When I measured my 550P to select my battery, it was closer to an average of 0.8 amps over 8 hours... or 6.4AH per night. Perhaps I'll do the exercise again as I add the 560P plug to my kit.
(This post was last modified: 06-04-2015 03:08 PM by GWild.)
06-04-2015 03:03 PM
Find all posts by this user Post Reply Quote this message in a reply

Donate to Apnea Board
lmoretti Offline

Preferred Members

Posts: 75
Joined: May 2015

Machine: PR System One 60 with AFlex
Mask Type: Nasal pillows
Mask Make & Model: Resmed P10
Humidifier: PR
CPAP Pressure: 9
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location:

Post: #8
RE: Running on LiIon Batteries?
(06-04-2015 03:03 PM)GWild Wrote:  I am dubious on the 0.3 amp number. When I measured my 550P to select my battery, it was closer to an average of 0.8 amps over 8 hours... or 6.4AH per night. Perhaps I'll do the exercise again as I add the 560P plug to my kit.

Okay, I made a mistake with my calculations above: the power supply is a 60watt DC power @ 12 volts, which is equal to 5A, not 0.5. I used 120v instead, which is the supply side voltage. The one with a heated hose has an 80watt power supply, which is 6.6A. I'm guessing the power supplies are SEVERELY overrated though.
06-05-2015 09:29 AM
Find all posts by this user Post Reply Quote this message in a reply
GWild Offline

Preferred Members

Posts: 88
Joined: May 2014

Machine: RemStar Sys1 560P
Mask Type: Nasal mask
Mask Make & Model: Ultra Mirage
Humidifier: Sys1
CPAP Pressure: 8 - 20 auto / 8.9 avg
CPAP Software: SleepyHead EncoreBasic

Other Comments:

Sex: Undisclosed
Location:

Post: #9
RE: Running on LiIon Batteries?
(06-05-2015 09:29 AM)lmoretti Wrote:  
(06-04-2015 03:03 PM)GWild Wrote:  I am dubious on the 0.3 amp number. When I measured my 550P to select my battery, it was closer to an average of 0.8 amps over 8 hours... or 6.4AH per night. Perhaps I'll do the exercise again as I add the 560P plug to my kit.

Okay, I made a mistake with my calculations above: the power supply is a 60watt DC power @ 12 volts, which is equal to 5A, not 0.5. I used 120v instead, which is the supply side voltage. The one with a heated hose has an 80watt power supply, which is 6.6A. I'm guessing the power supplies are SEVERELY overrated though.

No - I don't believe the supplies are overrated ... my machine has drawn 25 watts at times... and pretty sure it wasn't at max pressure and volume.

These were peak currents while in use, and the average is certainly less, but the brick supply has to handle the peak currents otherwise the machine would stop working.
06-05-2015 10:30 PM
Find all posts by this user Post Reply Quote this message in a reply

Donate to Apnea Board
Post Reply 


Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  sourcing batteries for Transcend, preferably generic bunter 22 2,524 08-19-2016 01:34 PM
Last Post: pl99
  [CPAP] Calculatur for S9 on 12V batteries nilsola 7 822 12-06-2015 02:08 AM
Last Post: nilsola
Thumbsup SleepMapper is up and running! [Philips-Respironics software] Hdowning 49 33,644 11-16-2015 07:46 PM
Last Post: jpsgt2
Exclaimation [Equipment] Wearing mask without running the machine DeepBreathing 10 1,545 09-19-2015 11:18 PM
Last Post: Jim Bronson
  Spoke with ResMed, got cable info for both batteries. Double checking with you. JVinNE 20 3,838 04-17-2015 08:27 PM
Last Post: justMongo
  Carbon monoxide and deep cycle batteries (during charging.) A question. JVinNE 12 3,063 04-17-2015 06:23 AM
Last Post: AlanE
  Sneezing, Running nose problem KarenSW 8 2,047 02-11-2015 04:35 PM
Last Post: trish6hundred

Forum Jump:

Who's Online (Complete List)