RE: CPAP Battery Power in RV
(05-28-2019, 02:07 PM)Insopita Wrote: Theoak, thanks for your response. I'm hoping I'm good on all counts. Luckily, my rv has a tv 12-volt outlet right over my bed. I'm planning to order part number 37297 for the power supply. From Supplier #1 on the above list. I have two 6V batteries which as you stated, will charge up while driving or generator where allowed. As I'm not real handy, I'm glad I won't be wiring anything! Thanks again 
Super lucky! It does not get much easier than that then. You're set. Happy camping!
RE: CPAP Battery Power in RV
(05-28-2019, 02:07 PM)Insopita Wrote: Theoak, thanks for your response. I'm hoping I'm good on all counts. Luckily, my rv has a tv 12-volt outlet right over my bed. I'm planning to order part number 37297 for the power supply. From Supplier #1 on the above list. I have two 6V batteries which as you stated, will charge up while driving or generator where allowed. As I'm not real handy, I'm glad I won't be wiring anything! Thanks again
37297 is what I have it works great I bought mine direct from Resmed as I am in the UK but Supplier #1 is reliable
RE: CPAP Battery Power in RV
The Resmed DC-DC power supply that you propose to buy is by far the best option for running on 12-volt power. You can reduce battery drain significantly by using "passive humidification". That does not mean doing without water in your humidifier, just turn off the humidity controls and heated hose. This will make your machine battery friendly and will use about one-fourth the power as compared to using heated humidity and tubing. Chances are, your RV has sufficient capacity to run your CPAP with humidity, but turning off the heat makes it a sure-thing.
05-29-2019, 09:48 AM
(This post was last modified: 05-29-2019, 12:17 PM by OMyMyOHellYes.)
RE: CPAP Battery Power in RV
Two realistic options:
1. Buy and used the obscenely expensive ResMed DC-DC converter (PAP has to see the secret handshake coming from the converter to work) or
2. Use an inverter, but that's WAY inefficient. Never, ever advised unless there is NO OTHER WAY.
A third option would be to build your own converter that will supply the secret "handshake" to the unit (a few years back we had forum members that just couldn't figure out what to do with all their surplus time so they reverse engineered the Resmed unit and posted it for all the world to see. Hope you're real damn handy with a soldering iron and other electronics technique....)
There. I said it.
OMMOHY
Contrarian in Residence
RE: CPAP Battery Power in RV
is the resmed DC-DC converter expensive from the material cost point of view, yes. However if you don't want to fiddle with this and potentially burn out your CPAP just to save a few bucks, just buy the converter. There is a thread on here about how to make a solar powered (recharging) rig that will also work as a great UPS system in the house. You don't have to "build" anything but do have to connect the wires. If you can follow how to connect the wires you are good to go.
Camping, RV'ing, power outages... are a thing of the past
RE: CPAP Battery Power in RV
(05-29-2019, 09:48 AM)OMyMyOHellYes Wrote: Two realistic options:
1. Buy and used the obscenely expensive ResMed DC-DC converter (PAP has to see the secret handshake coming from the converter to work) or
2. Use an inverter, but that's WAY inefficient. Never, ever advised unless there is NO OTHER WAY.
A third option would be to build your own converter that will supply the secret "handshake" to the unit (a few years back we had forum members that just couldn't figure out what to do with all their surplus time so they reverse engineered the Resmed unit and posted it for all the world to see. Hope you're real damn handy with a soldering iron and other electronics technique....)
As an electronics geek in hiatus right now (too busy getting the house ready to sell to tinker with hobbies), my interest has been most piqued......
Find post at "My battery backup setup" (search titles only for that phrase) post#59
(I can't post links as I don't have enough posts on the forum yet)
It's a simple pullup resistor (2.7 kOhm) from the center pin to +3.3V. Bravo! That's almost too simple. Now I just need to find a source for the special barrel plug used on the ResMed and I might have a small project on my hands soon.
(first thought- source 5V USB from a decent portable lithium-battery-powered USB phone charger or solar battery setup and boost to 24V to run a resmed at its minimum settings with no frills, possibly need to rely on USB-C for drawing enough power though, and a USB-C PD capable portable battery)
RE: CPAP Battery Power in RV
The deed is done, part 37297 will be here on Monday. My trip departure hopefully will be on Wednesday. :-) After reading the posts on your experiences, decided that's best for me. No tinkering for me! Thank you for the input. 
RE: CPAP Battery Power in RV
If you are curious Maxoak sells a battery capable of DC-DC with a single cable/adapter using 24V... I recommend it highly!
RE: CPAP Battery Power in RV
(05-31-2019, 08:26 AM)Diotima245 Wrote: If you are curious Maxoak sells a battery capable of DC-DC with a single cable/adapter using 24V... I recommend it highly!
I saw that ... I notice it has a 12V out AND a 24V out. I have a ResMed, my wife a Phillips. For a single CPAP it claims 3-6 nights of use. Can both outs be used at the same time? Yes, I won't get 3-6 nights that way using both, but if my wife and I wanted to go camping for say 2 nights if both outs work at the same time ... this could work for the both of us.
05-31-2019, 01:06 PM
(This post was last modified: 05-31-2019, 01:09 PM by Diotima245.)
RE: CPAP Battery Power in RV
(05-31-2019, 11:09 AM)theoak Wrote: (05-31-2019, 08:26 AM)Diotima245 Wrote: If you are curious Maxoak sells a battery capable of DC-DC with a single cable/adapter using 24V... I recommend it highly!
I saw that ... I notice it has a 12V out AND a 24V out. I have a ResMed, my wife a Phillips. For a single CPAP it claims 3-6 nights of use. Can both outs be used at the same time? Yes, I won't get 3-6 nights that way using both, but if my wife and I wanted to go camping for say 2 nights if both outs work at the same time ... this could work for the both of us.
As far as I know yes you could that...without humidifier you could probably run both units. It might even handle with humidifier one for a single night w/ both CPAPs. It comes with 1 adapter that is used to "trick" the AirSense 10 into thinking it's getting power from the ResMed power brick. If you have some way of charging it during day then essentially you wouldnt need anything else... there are fairly cheap solar charging solutions out there.
I sent the customer support for Maxoak a email asking them however just do get a better answer. I will reply back once I get that info.
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