ac - dc converter

Hello everyone. I use a DC to DC buck boost converter when I am out of Hydro power to go from a 12.5v to 24v to my CPAP machine. Cpap Airsense 10 or 11 Specs ac to dc adapter Resmed 120v 1 amp -> 24v 2.75 max 65 watts I use less no heat plate and no heated tubing, I use on average around 30 -...