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Old 05-10-2017, 02:52 PM   #1
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Inverter powered outlets / CPAP

I was happy to discover that the bedroom outlets next to the bed in our 2018 Greyhawk are now tied to the inverter - woo hoo! As a CPAP user, this is a big bonus when camped without shore power. Great to see that the Jayco engineers do listen to their customer's wants and needs.
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Old 05-10-2017, 04:19 PM   #2
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Are the inverter powered outlets marked in any way (or listed in the manual) or am I just gonna have to go throughout the coach with my iPhone and charger testing each?
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Old 05-10-2017, 04:26 PM   #3
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Nope not marked. But from what I know about previous year models only the recepticle next to bunk TV and the one in the bedroom that powers that TV are powered.
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Old 05-10-2017, 05:09 PM   #4
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That is GREAT!!!

You may want to look into adding a second HOUSE battery, to ensure you make it through the night if, the CPAP machine uses the humidifier. If it is the standard battery there will not be enough reserve power for both the CPAP and central heating should it be needed.

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Old 05-10-2017, 06:47 PM   #5
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I just installed 12v on either side of the bed. Both me and my wife use a C-PAP. I purchased the 12v cord for each machine. My experience with the installed inverter (1000w Xantrex in my 2016 29MV) is that the 6 gauge wire that connects it to the battery is not sufficient and the length of the wire is too long. Xantrex recommends 2 gauge wire that is 5 feet long round trip! I bought an 1800w Xantrex and moved it from under the bed to the cargo bay next to my two 6v golf cart batteries. I used 1 gauge wire to connect it to the batteries. I will still prefer to plug the C-PAPs into the 12v outlets when I dry camp. The C-PAPs would use a lot of battery power to run on the inverter with the built-in humidifiers also running. So if I don't use the humidifiers, I might as well run the C-PAPs directly on 12v. When you use the inverter to run the C-PAPS, you are taking 12v from the battery, changing it to 120v in the inverter, then the C-PAP converts that to 12v. Every change in voltage is inefficient and you waste precious battery power. I would also install a second battery as stated above because you may need to run the furnace or lights and such. Let us know how the new setup works.
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Old 05-10-2017, 06:56 PM   #6
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Some of the newer CPAP machines are now 24VDC, unlike the 12VDC unit I have. You may want to check the transformer to see what its output voltage is.

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Old 05-10-2017, 07:04 PM   #7
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Mustang65 is correct! When I got my C-PAP (and my wife's) I insisted that the be able to run on 12v. The people at the sleep center who tested us and wrote the script for the C-PAPs didn't know what we were talking about, so I educated them! There was no problem ordering the correct C-PAPs that run on 12v.
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Old 05-11-2017, 07:24 AM   #8
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Quote:
Originally Posted by Mustang65 View Post
Some of the newer CPAP machines are now 24VDC, unlike the 12VDC unit I have. You may want to check the transformer to see what its output voltage is.
Yes Don, my CPAP is newer and 24V. Resmed Airsense 10...
  • AC Input Range - 90W Power Supply: 100 - 240V, 50 - 60Hz, 1.0 - 1.5A, Class II
  • DC Output - 90 W Power Supply: 24V --- 3.75A
  • Typical Power Consumption: 53W (57VA)
  • Peak Power Consumption: 104W (108VA)
I'm not a electrician so do you think the inverted battery supply will make it through the night (6-7 hours without use of the humidifier of course)?
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Old 05-11-2017, 10:34 AM   #9
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Using your typical power consumption of 53 Watts....

53W / 12volts = 4.4amps x 8 hours = 35.3 Amp hours

That will bring a typical single group 24 battery down to 50% over the course of 8 hours. With anything else running you would probably be running the battery down below 12 volts and shortening its life.

You will need a bit more Ah capacity to run a CPAP for a couple nights.
Add in going from 12 volts to 120 volts and back to 24 volts and you will be losing power in the conversions as well.

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Old 05-11-2017, 11:06 AM   #10
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Thanks Subaru297. Resmed offers a kit for 12VDC systems (step up to 24V). Is there less draw on the battery when converting to 24V vs 110V?
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Old 05-11-2017, 11:11 AM   #11
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I'm not sure but I think a DC to DC conversion is more efficient.

Even so you are borderline though and I would add another battery or upgrade to twin 6 volts. Are you still just using the standard group 24?
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Old 05-11-2017, 11:17 AM   #12
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Yes brand new 2018 and what ever they are putting in current models..
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Old 05-11-2017, 11:29 AM   #13
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Sorry I should have read your signature....

Since it is new I would go back to your dealer and get another matching battery and install it if there is room for it. That should give you sufficient capacity for a night.
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