tim tarras
WKR
I have a traveling CPAP with a renogy 360 battery back Like this. I can get 3-4 nights and charge my phone off of it. It will go longer if you recharge it with a solar panel.
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Got a link?1000wh+ power stations are running $220 or so right now. Be sure and get the 12v adapter for your machine ($40). The hose insulator is nice if it's going to be super cold.
That power station should last you 5-6 nights easily.
There are ecoworthy 150ah lifep04 batteries on sale for $220 right now. That's 1800wh. You could probably push that battery up to 10-14 days without a recharge.
Interestingly, I tried going this route.This is not meant to diagnose anyone's sleep apnea, but an oral appliance like a Mandibular Advancement Device made at a dentist or other sleep center can be used for short term trips and don't require any power. Definitely would want to try one at home and have it fully adjusted before going, but it's a nice backup.
Full disclosure: I am a dentist and we make these.