A direct conversion from 12v to 24vdc is more efficient than going from 12v through an inverter to make 110vAc ...then back through the Airsence10 power supply to 24vdc.
Each device that makes a conversion along the chain is never 100% efficient and therefore unnecessarily wastes power. Simply...If a device gets even slightly warm while doing its job of converting...that's wasted power that could otherwise be used to run the Cpap machine.
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