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NAP1947 View Drop Down
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Joined: 14 Aug 2017
Location: Ottawa, Canada
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Posts: 72 		Direct Link To This Post Topic: CPAP help, new
    Posted: 15 Oct 2017 at 6:17am
Furpod, shows how much I have to learn, I will see if they will sell it without the battery and take the one out of our MG to pick it up.
Thanks
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StephenH View Drop Down
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Joined: 29 Nov 2015
Location: Wake Forest, NC
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Posts: 6419 		Direct Link To This Post Posted: 15 Oct 2017 at 1:59pm
What I did was purchase the two 6V batteries plus the cable needed to connect them together and took them with me when I went to pick up our 179. Because I did not take the 12V battery, the dealer did give me a credit which I used in the store to purchase some of the accessories we needed.
StephenH
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ouR escaPOD mods
Former RPod 179
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NAP1947 View Drop Down
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Joined: 14 Aug 2017
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Posts: 72 		Direct Link To This Post Posted: 15 Oct 2017 at 8:14pm
Stephen, thanks for your informative responses.
We are in Canada and hope to close this week, we plan to store at the dealer until April.
I will p/u Duracells at Batteries plus Bulbs from their outlet on Glenwood Ave in Raleigh as it is only a couple miles from our daughters home.
I did some digging into our ResMed units and there is a humidifier off setting, in addition we can use the main unit without the humidifier attached which should really help the draw.  From what we read with night time humidity in the R-Pod with 2 people sleeping we should not need the extra moisture.
Experience will tell but I feel much better about the dual golf cart batteries than any other option.
Cheers
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GlueGuy View Drop Down
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Posts: 2706 		Direct Link To This Post Posted: 16 Oct 2017 at 10:52am
It's funny. We went out on a hike yesterday, and because we were traveling to an area where we don't often go, we turned on the local news/weather/traffic station while going there. Coincidentally, they were advertising a Transcend mini-CPAP, and promoting the low power/DC operation.

It got me to wondering, and it appears that this is a new market segment for people that need to travel with a CPAP. In the little bit that I looked around this morning, I found several different makers of mini-CPAP machines; and many of them operate on DC power from a cigarette lighter plug and/or a small (separate) battery pack. In addition, many of them operate at less than 30 dbA (meaning really quiet).

Several of the ones that I looked at consume less than 20 watts; which would be ~~ 1.7 amps at 12 volts. It seems one of these would be an ideal solution for someone looking to boondock with their CPAP. These are some that I've found:
  • Transcend Auto
  • Z1 Auto
  • Dreamstation Auto
  • ResMed AirMini
bp
2017 R-Pod 179 Hood River
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Posts: 1407 		Direct Link To This Post Posted: 16 Oct 2017 at 12:02pm
I also have a Respironics System One with dual GC2 batteries, except that mine are 230Ah. The AC power supply is rated at 65W, so I figure I could run my CPAP for 21 hours (115Ah * 12V = 1380WA / 65W) with the humidifier on if that's the only load on the batteries, so the batteries will easily handle a single night of the CPAP with humidifier and all other loads.
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GlueGuy View Drop Down
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Posts: 2706 		Direct Link To This Post Posted: 16 Oct 2017 at 12:51pm
Originally posted by TheBum

I also have a Respironics System One with dual GC2 batteries, except that mine are 230Ah. The AC power supply is rated at 65W, so I figure I could run my CPAP for 21 hours (115Ah * 12V = 1380WA / 65W) with the humidifier on if that's the only load on the batteries, so the batteries will easily handle a single night of the CPAP with humidifier and all other loads.
Using two of those batteries (230 ah @ 6V), each battery has a total of 1380 WH, for a total of 2760 WH to full depletion. Assuming they are wet batteries, they can safely be depleted to ~~ 50%, for a total of 1380 WH. If they are AGM batteries, they could be depleted (typically) to ~~ 75% depletion, so that would give you ~~ 2070 WH.

My estimate for the wet batteries would be ~~ 1380/65 = 21 hours (what you figured)
My estimate for AGM batteries would be ~~ 2070/65 = 31 hours

Of course, that's assuming that nothing else is drawing from your batteries (unlikely).

If you were using a mini-CPAP that was running at ~~ 20 watts would get 69 hours or 103 hours respectively.
bp
2017 R-Pod 179 Hood River
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NAP1947 View Drop Down
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Posts: 72 		Direct Link To This Post Posted: 18 Oct 2017 at 4:46pm
We have been watching the arrival of the mini/portable units.
When It is time for new ones we will definitely consider them.
Until then the dual GC batteries should do us fine.
Susan and Norm
2016 Venza, V6 factory tow
2018 RP179
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