[Equipment] Backup/UPS for CPAP

[SleepyStreets]

Hey, 
I recently got my first CPAP machine (Airsense11). It's been amazing after I got used to it. My sleep study had me at 76 events an hour, I'm down to 0.2 an hour. 
I am trying to find a UPS type device for my machine, I have kept my machine connected to a smart switch for the last 2 weeks so I can monitor energy consumption. On average with heated hose and humidifier running I'm consuming around 300Wh a night. Since the AS11 runs on 24V I am consuming 12.5 Ah a night. 
I have an old UPS battery (12V) from work (it was going to be tossed out since it was 5 years old but it still is good) it's a 100ah behemoth of a battery. If I get the 12V to 24V cable from ResMed and a battery maintainer could I plug the battery maintainer in (keeps battery charged when there is power) and then connect the 12V to 24V adapter to the battery and always run off this contraption? 

If my math is right the 100Ah battery would provide me with 7 (8 but don't want to completely drain it)nights sleep before I need to charge it.

Does this make sense to anyone, I feel like I am missing something obvious in my plan.

[Crimson Nape]

Hi SleepyStreets!  -  
The link below has 15 threads, all dealing with CPAP backup.  I hope this may help.  I used the search term, "CPAP backup".
https://www.apneaboard.com/forums/search...order=desc

- Red

[Tampa Jim]

We're both on therapy & require backup power supplies due to our location.
I'd advise buying more, not less, than CPAP only needs, and allowing cushion.
You'll find the backup valuable for recharging your phones at the minimum.

Here's a handy guide for ResMed equipment. Read thru it and learn the math.
Once you've got a handle on it, create your cheatsheet for the AutoSense 11.
Best wishes.

https://document.resmed.com/en-us/docume...lo_eng.pdf