(02-22-2015, 08:13 PM)retired_guy Wrote: Yes, I would not want to be mean either, but your cpap does not run off of a battery. So why did you try to charge it up?
The Respironics 550 will work GREAT off of a battery source. Without converter. 12 V on the 25mm plug, center positive, outer negative, and you're good to go.
That is one reason that I have switched over to Respironics from the Resmed line - so easy to just hook up to battery in the event of power outage: uncouple humidifier, Swap tube to flow generator. Get battery from closet. Set battery on floor by bed. Hook up battery line. Turn on. Go back to sleep. For several days if desired. Depending on battery capacity. Like 10 days, conservatively, on my settings out of a 39 AH SLA battery...