08-14-2016, 07:17 PM
(This post was last modified: 08-14-2016, 07:51 PM by Marthajoy7.)
I agree on wire sizes. Size 22-24 stranded wire is only rated for a couple of amps. Could be used for very short runs only. My batteries have Anderson SB50 Connector Kit, Gray on them, as that is what my scooter uses. So I put them on all my portable batteries. I made up a cable that connects 2 batteries in series to a XLR female connector for charging inside. Can make similar with 2 female connectors and use male XLR to power connector. Easy to install resistor inside XLR male connector. This would allow power to multiple machines. Size 16 might be over kill, depends on how long a run you are building. Size 18 seems good to me, but like a say, depends how far away from the batteries you intend to sleep.
What concerns me most, is what happens in a power outage. That means our home is getting cold quickly, and I may very well need lots of heat and humidity from my unit to keep me from freezing. A couple of years ago, we had an outage that lasted almost a week. In winter time no less. Ended up having to stay a while with friends, as could not even endure it at home any longer. It almost had me worried that any outage, would have us packing up and finding a motel somewhere. Even if it turned out to just be for just a half hour. I used an inverter to be able to watch tv till all our batteries were depleted. But either cold food or eat out becomes the norm. Just know I need a backup plan, even if it never is used
18 AWG is probably pretty much OK for 10 A at 10'~3M. I just happen to keep spools of 16 AWG, 12 AWG or 10 AWG red/black zip cord around......
Heat and humidity from your machine? They are not designed to keep you warm. They are only designed to raise the water temp barely enough to increase the vapor pressure of the water. And much heating would result in heavy condensation (rainout) in a colder room. I say it doesn't make much difference, though I find breathing difficult at higher temp/humidity settings (hotter, more humid air being less dense and carrying less O2). I can breathe better camping in cold climates than I can in more tropical locations.
Sleeping in a cold room with a CPAP does not materially increase your risk of freezing any more than a person not using CPAP. You can pretty well breathe cold air. I actually quite enjoy it in colder winter climes.
Question? Why are you thinking 10 amps @ 24 volts? That is 240 watts. There is a 10 amp fuse but my thinking that is protection against accidental shorting. Much as in CB radios had a reverse biased diode on power up. If hooked up correctly, every thing was fine, but if connected backwards, the diode would short taking fuse and likely traces off the circuit board, requiring repair. Because they did not want to drop the input voltage that a series diode would have.
I am being told to expect like 10 watts per device if humidity and heated hose is not used. That would mean less than 1 amp for 2 devices. At 10 amps you would deplete two 40 ah batteries in less than 4 hours. I really do not think, even at units using everything, you are going to be using anywhere near 10 amps @ 24 volts. Even the companies up converter cannot handle 10 amps @ 12 volts, as that would be 120 watts, or even 135 watts @ 13.5 volts.
Since I do not expect 2 fully charged 40 ah batteries to only be good for 4 hours, as I can sleep long hours say 10 at a time. I would like to keep current draw @ 4 amps or less. At 24 volts that is 120 Watts of power. I do not expect that I would ever exceed those limits. So with less than 4 amps being used, yes, one could easily place a 4 amp fuse instead of a 10 amp one, and still not expect it to blow. I doubt the dreamstation used much more than 4 amps @ 12 volts leave alone 14 volts.