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Camping using Converter
There is an insignificant inefficiency in stepping up DC voltage, but it is not anything like the inefficiency of a DC to AC inverter. A number I have seen is greater than 85% efficiency. The main disadvantage is the cost of the proprietary connector and the bulk of the converter rather than just using a simple connector cord. If I recall from an earlier discussion, the Resmed power supplies deliver a small current measured in Ohms to the center pin. Without that signal the machine will not operate on an unauthorized power supply. If all we had to so was step-up from 12-24 volts, that would be pretty easy.

I have a Philips Respironics BiPAP backup machine and use that on straight 12V power if I use a battery.
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current measured in Ohms...

Current is measured in Amperes (with or without a multiplying prefix such as "milli")

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(04-26-2017, 09:37 AM)justMongo Wrote:
current measured in Ohms...

Current is measured in Amperes (with or without a multiplying prefix such as "milli")

Yes, ohms measure electrical resistance
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