weird.vibes
New Member
- Joined
- Sep 7, 2022
- Messages
- 2
Hello all!
I'm yet another CPAP user (technically BIPAP) who enjoys camping and wants a UPS backup at home. After combing through all the threads on this forum and others, one thing is clear - not all CPAP pressure settings/machines use the same amount of power. I'm using a Resmed AirCurve 10 VAuto, and according to my Kill-a-watt meter, I used 67wh over an 8 hour period with no heat settings enabled, I figure 80-100wh just to be safe. With my normal heat/humidity settings however, that number goes up to an average of 400wh for an 8 hour period, so I figure I need to assume 500wh would be a safe number to work with. Just to be clear I'm unplugging the watt meter during the day to have accurate watt hours.
Now that that's out of the way I do feel comfortable doing a DIY system, having done a solar install on our travel trailer (victron 100/30, 270w residential panel, battleborn heated 100ah), although in this economy I've opted to leave the trailer home for solo trips which is why I'm considering a portable unit. My cpap unit runs on DC but will not work on straight 24v and I already have the 12>24 converter cigarette adapter.
In the field I'd use an MPPT CC and solar to charge the battery, but what I'm unclear on is - is it as simple as a battery charger plugged into 120v, into a 12v lifepo4 100ah battery, running the (fused) device from the battery? Obviously this isn't really a UPS but is there a better DC option for in home use or am I just over thinking it? Using this thread for reference.
I'm yet another CPAP user (technically BIPAP) who enjoys camping and wants a UPS backup at home. After combing through all the threads on this forum and others, one thing is clear - not all CPAP pressure settings/machines use the same amount of power. I'm using a Resmed AirCurve 10 VAuto, and according to my Kill-a-watt meter, I used 67wh over an 8 hour period with no heat settings enabled, I figure 80-100wh just to be safe. With my normal heat/humidity settings however, that number goes up to an average of 400wh for an 8 hour period, so I figure I need to assume 500wh would be a safe number to work with. Just to be clear I'm unplugging the watt meter during the day to have accurate watt hours.
Now that that's out of the way I do feel comfortable doing a DIY system, having done a solar install on our travel trailer (victron 100/30, 270w residential panel, battleborn heated 100ah), although in this economy I've opted to leave the trailer home for solo trips which is why I'm considering a portable unit. My cpap unit runs on DC but will not work on straight 24v and I already have the 12>24 converter cigarette adapter.
In the field I'd use an MPPT CC and solar to charge the battery, but what I'm unclear on is - is it as simple as a battery charger plugged into 120v, into a 12v lifepo4 100ah battery, running the (fused) device from the battery? Obviously this isn't really a UPS but is there a better DC option for in home use or am I just over thinking it? Using this thread for reference.
