Backup Battery

About a week into my CPAP therapy with my air sense 11. Hurricane season just began here in Florida and I’m looking for recommendations and/or options to continue CPAP therapy when the power goes out.

There are a pretty wide range of solutions available depending on your exact needs.

The ResMed web site lists several solutions, and many online CPAP suppliers carry 3rd batteries that are specific to the S11. These tend to be fairly expensive ($350 or so). Most will run the machine for 8 to 10 hours provided you don't use the humidifier or hose heat. The humidifier especially uses a lot of power, the hose as well but less. Either use much more power than the machine. The biggest limitation to these is the run time, they are designed for about one night. This could be a limit if you don't have a source of power to recharge them.

Another way to look at the problem is to use an inverter to produce 120 V from a battery. I used to have a large marine battery in the basement with an inverter. It could run my WiFi, CPAP and a few other things for quite a while. Battery life was limited if I tried to do too much, but it would run a CPAP for much longer than the small batteries. It's not out of the question to run an inverter or power converter from a car using a long cable. A power converter is more efficient than an inverter, they are available for this application.

I've also built an inexpensive backup using a DC to DC power converter (a module from Amazon). The ResMed machines run on 24 Volts. But I have a lot of battery power tools that use batteries and always have half a dozen or so charged, 18 volt Ryobi. Each battery will run my S10 for 6 to 8 hours, the S11 would run quite a bit longer since its lower power. its not a complicated project if you are technically minded.

We don't get hurricanes nearly as often as Florida but when we do we are typically out of power for about a week. I've got a standby generator now so I don't worry too much. But I also have a Z1 travel machine and a 3rd party battery pack (12V) that will run it. This is both a backup and a setup for travel.

I hope this helps.

I'm thrilled with my EcoFlow Delta2.

It's expensive, but has features that few other (maybe none) backup solutions have that are ideal for CPAP use.

Here's a topic about the Delta, within are some posts I made about many of the features:

viewtopic/t189452/If-you-can-afford-one ... s-hit.html

Any sort of battery backup will work. the issue is how long will it provide power.

I found this thing that uses my batteries from lawn tools.

https://duckduckgo.com/?q=ryobi+power+b ... 0BG_02.jpg

Any sort of battery backup will work. the issue is how long will it provide power.

I found this thing that uses my batteries from lawn tools.

https://duckduckgo.com/?q=ryobi+power+b ... 0BG_02.jpg

I don't think this is very good advice.

• No, any sort of battery will not work.
• How long it will provide power is a critical part of the decision. In all but the highest capacity power-tool batteries, capacity will be a problem.
• This is an AC-inversion solution, a lot of capacity is lost when inverting DC to AC. AC-inversion solutions, while not ideal, are fine when their is a lot of capacity, which this doesn't have.
  Power-tool batteries are expensive

If you happen to have some larger capacity power-tool batteries and an inverter, then it will do in an emergency. But don't spend any money towards this as a CPAP backup battery solution