Camp mode with CPAP machine - roof power supply tap, 48V to 24V converter, CPAP shelf, Molle panel.

[Eyesore]

I like to camp in the back of my Cybertruck, and my CPAP machine gets in the way. Drawing power from the 110V outlet using a power supply is inefficient.

This is what I have in my Amazon cart:

The barrel connector is what my Resmed Airsense 10 needs for a 24V, 3.75A (90W) connection.

My plan is to mount the shelf to a molle panel on the side of the truck bed, and put a connector on the roof tap. When setting up camp, get 48V power from the connector to the 48V to 24V buck converter attached to the shelf. I'm assuming when I put the vehicle in camp mode, I can leave the roof tap power on.

It just occurred to me that routing the 48v power feed into the back while allowing the tonneau cover to close will be a challenge. On solution is just use a long 48v cord and route along the bed and up in the gap at the bottom of the tailgate. It is only needed when camping, so OK to run the cord along the outside.

Any suggestions?

-Scott.

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[Eyesore]

I think I'll run a permanently connected wire from the roof power tap under the sail applique and into a 48V power jack bulkhead connector I add to the side of the bed.

 

[Eyesore]

I think I'll run a permanently connected wire from the roof power tap under the sail applique and into a 48V power jack bulkhead connector I add to the side of the bed.

I've decided not to try to power my CPAP from the 48V roof tap. I can't get the the roof tap to stay on unless I leave the climate control on (camping mode) or the inverter on (outlets always on). This defeats the purpose of reducing the demand on the truck battery to run the CPAP.

Cybertent mode does not leave the roof tap powered.

I may try an e-bike battery instead.

However, I have not yet been able to get my ResMed Airsense 10 to wake up on a 24V DC battery power supply. It seems the Airsense needs to see a specific voltage other than 24V on the center pin of the connector.

This post says the center pin needs 3.3V, with 24V across the outside to the inside of the barrel connector.
I measure 118 mV on the center pin of my OEM power supply.

-Scott.

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