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Old 10-28-2018, 08:29 AM   #1
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Dry Camping with a CPAP

We frequently boondock and/or dry camp. An issue has arisen! My wife just started using a cpap machine. There must be others in this situation, Im not sure of the wattage draw on the machine as I thought about plugging into a 800 watt inverter outlet in the rig. What do other cpap users do?
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Old 10-28-2018, 08:45 AM   #2
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Been using CPAP for years in my RV. We have a 40’ Discovery with a larger inverter (and battery bank, probably) than you have. The demand of the CPAP definitely impacts battery life a bit, but this can be mitigated a bit by setting it to “airplane mode”. This shuts off the heater function, but may not be as comfortable for the user.

You might find it necessary to augment your battery bank if you find them discharged unacceptably by morning.

PM me if you want. I have been using the CPAP for years and can answer some questions if you have more that you want to cover that way.

Mike
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Old 10-28-2018, 08:47 AM   #3
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My buddy tried his on a 400 watt inverter and no go.

I lent him my spare 750 Watt and it worked only with jumper cables, not the internal cigar lighter wiring.

That means it needs around 500 watts or more. 500 watts ÷ 12 volts = 42 amp draw from the batteries. If you sleep for 8 hours, that's 336 AH from your batteries. Your going to need a minimum of 600 AH of capacity to run a heated CPAP.
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Old 10-28-2018, 09:06 AM   #4
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I recently started on a Philips Resprionics BIPAP Auto SV. My sleep has been much improved. I bought the 12 volt power cord that is sold by Philips for my machine. I hooked it up to one of my portable 50 amp hour LiFePO4 batteries and monitored it with a digital meter that shows amps, voltage, cumulative amp-hours, etc... My is drawing between 4 to 6 amps with the humidifier heater going. Maybe more if I am having a mask leak. I haven't been on battery all night yet but I figure about 40-45 amp-hours.

My machine costs about $3800 If I replaced it on from an Internet seller. I decided to buy a regulated DC-DC power supply that will take 8-20 volts DC input and output up to 8 amps of regulated and fully isolated 12.5 volts DC. I don't need it on a stand alone battery, isolated battery but don't want to use it on my trailers DC system without the added protection. My auto servo ventilation system warns about not using it on a 12 volt adapter hooked up to a running vehicle. I payed $118 for the regulated power supply.

I have 400 amp-hours of LiFePO4 batteries in my trailer and about 1000 watts of solar to recharge them. I will have plenty of capacity for the machine even with the humidifier going.
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Old 10-28-2018, 11:17 AM   #5
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Here's what I posted about my cpap setup.
http://www.irv2.com/forums/f93/boon-...ml#post4326130
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Old 10-29-2018, 09:36 AM   #6
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Originally Posted by lakewoodpaul View Post
We frequently boondock and/or dry camp. An issue has arisen! My wife just started using a cpap machine. There must be others in this situation, Im not sure of the wattage draw on the machine as I thought about plugging into a 800 watt inverter outlet in the rig. What do other cpap users do?
Your CPAP machine is 12 volt. It has a block in the cord, making it 12 volt. I've been using a cpap for over 25 years in the RV'S. Right now I'm using it with my 2000 watt inverter. But the easiest way is to connect it to your 12 volt system. You may want to dis-connect your humidifier, as that uses a lot of power.
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Old 10-29-2018, 08:23 PM   #7
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I got a 12v cord for my CPAP from Amazon, and don't use heat. I just put distilled water in the reservoir but no heat. I can recharge the group 24 battery with my generator and 15 amp battery charger using my gennie, or the 200W portable solar panel set I have. It's worked great for three years of boondocking and RV park stays.
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Old 11-01-2018, 04:55 PM   #8
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Be careful about the 12volt. I checked my wife’s AirSense and it was 24v so I bought a converter brick from them that changes 12 to 24. Then I just wired the brick to the closet 12 volt light. Works good but check your machine first.
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Old 11-01-2018, 05:48 PM   #9
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Be careful about the 12volt. I checked my wife’s AirSense and it was 24v so I bought a converter brick from them that changes 12 to 24. Then I just wired the brick to the closet 12 volt light. Works good but check your machine first.
I've had nine machines in the last 27 years, I never knew they came in 24 volt. I guess I got lucky. The first five years in an old 5th wheel we had at deer camp. I had to park my truck under the bedroom window, then I ran a home made cord to my truck battery through the RV window. I ran my Cpap for years like that.
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Old 11-01-2018, 05:57 PM   #10
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As others have said. I ordered the 12 vdc cord for my cpap. I installed a 12 vdc cigar lighter type outlet at my nightstand. I have an old cpap with only a 120 vac cord that I use when I need a backup cpap. I plug that into my small portable inverter. 400 peak, 200 watt continuas.
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Old 11-01-2018, 06:14 PM   #11
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Originally Posted by twinboat View Post
My buddy tried his on a 400 watt inverter and no go.

I lent him my spare 750 Watt and it worked only with jumper cables, not the internal cigar lighter wiring.

That means it needs around 500 watts or more. 500 watts ÷ 12 volts = 42 amp draw from the batteries. If you sleep for 8 hours, that's 336 AH from your batteries. Your going to need a minimum of 600 AH of capacity to run a heated CPAP.
Your buddy needs to get a machine from this century. My 6 year old bi-pap machine uses a 60 Watt brick which includes the humidifier. I use the direct 12 Volt cigarette plug-in cord in my RV and use the humidifier all night with no problem.
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Old 11-02-2018, 12:29 PM   #12
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Oops. The wife uses a CPAP and I use a BiPAP we run two nights on our battery using an inverter that was rated at 400 watts. I do have a home-brewed battery charger made from a gas engine that I got off an old power washer, and a car alternator this will charge car batteries when we need to. And yes there are some 24 volt both my wife's and mine run on 24 not 12 so you could buy the power converter bricks or just use a small inverter, both the wife's and mine are rated at 90 Watts, hope this helps.
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Old 12-19-2018, 02:38 PM   #13
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With CPAPs it all comes down to "to humidify or not to humidify". My wife's unit, a 24v with an inverter plugged into a 12v outlet uses the humidifier on all the time. Generally takes us down from 12.6 to 12.5 over night while using mine w/o the humidifier turned on. Seems like I can get away with running one humidifier pretty easily. My unit has an adjustable setting on humidifier. I've started messing around with putting hot tap water in the humidifier to start with and then turn my humidifier down pretty low to keep the amp draw lower. It has a 1-5 scale for setting and I seem to get away with it on 2 or 3 pretty easily............Jury is still out on this as of yet though.

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Old 12-20-2018, 03:24 PM   #14
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I have decided to buy a portable CPAP battery pack; because, I can use my FSA to pay for it. MAXOAK CPAP Battery Backup Power Bank for Airsense 10 Resmed S9 Philip REMstar System one 60 50...
by MAXOAK CPAP Battery Backup Power Bank for Airsense 10 Resmed S9 Philip REMstar System one 60 50 Dreamstation HDM Z1 Aircurve Airmini
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