How to calculate CPAP watt hours used?

[cate1898]

I am looking at buying a portable power station for use with my CPAP while boondocking (dry camping, no power).  I am currently looking at the Ecoflow River 2 which is 256Wh and has the DC input/output.  I only need it to last 1 night, then it can be charged within 1 hr the next day using a friends generator.  

Machine & Settings:

Humidifier removed/side panel installed to close off
12V DC adapter
Turn on Airplane Mode
Fixed Pressure at 10
unplug machine when not in use

So wondering if there is any formula for calculating how many watt hours my CPAP will use so I can determine which portable power station will fit my needs?  Hopefully not a really complicated explanation as watts, watt hours, voltage, amps - so confusing!

Thanks in advance

[Nightynite]

Cate, That unit will work for you based on your requirements.

I bought a 300 WH power station to run my Resmed autoset 10. I also bought a dc to dc converter cord. My battery technology is the lipo4. I can run 35 hrs on a single charge, with humidifier on OFF, water in tank for Passover moisture. You will get a little less hrs. but I think that’s a nice unit. Just google the difference between lipo4 and lithium batteries. You can buy power stations with both. You have to also use the dc to dc cord. All on Amazon.

Try searching for a Watt-hour Calculator online.

[cate1898]

Thanks for the reply.  I did buy online the KFD DC Adapter Car Charger for my ResMed Airsense. Is that the one you are talking about?  Also the power station I am looking at has the LiFePO4 battery, otherwise I'd be looking at a Jackery but sadly they don't yet use that technology.

EDIT: We decided to buy the 512Wh EcoFlow (500W) as we're hoping to run a small 12V 1amp fan as well. ?

[Nightynite]

Cate, that’s the exact dc to dc cord I have and it works good. The Lipo battery is a solid choice also.
Good job!