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JZ
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Posts: 10563
Registered: 10-3-2003
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There definitely seems to be an over use of CPAPs in America.
Can't believe everyone needs one. A bit of a crutch factor going on.
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elgatoloco
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Registered: 11-19-2002
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[/rquote]
Definitely an overuse of prescription drugs for people with so called depression especially kids who had to stay home last year.............a bit of a
crutch factor. Just saying. 
*I don't use cpap and I don't need antidepressants. yet.
This we me making an inane comment about something I have no practical experience with and it makes me look like an ass, does it not? we can all agree
that I (we all) would be better served if I was to have kept my mouth shut about something I not little to nothing about rather then open it and sound
like a fool. 
* I did do a sleep study at Scripps in 2019 with my wife in the interest of marital harmony. Turned out I scored slightly better and just under the
threshold for needing a cpap. In the last 18 months I have lost about 20 pounds and am more quiet in my sleep. If you know what I mean. 
Better living thru chemistry. And science.
[Edited on 6-28-2021 by elgatoloco]
MAGA
Making Attorneys Get Attorneys
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Bajabus
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Posts: 892
Registered: 8-30-2002
Location: Elias Calles B.C.S. or NC USA
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Mood: My friends..it's good.
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There is no such thing as a pure sine wave inverter. That statement is a marketing gimmick. The only way to produce a 60hz pure sine wave is to spin
an armature inside a stator at 60 revolutions per second.
All inverters produce a stepped waveform. The difference between a cheap inverter and a nice inverter is the number of steps in that waveform and the
filtering reactors it has. The really nice inverters have the ability to increase or decrease the number of steps depending on the load. The greater
the load the more steps produced. The 1st inverter able to do that and available to the public was the super sweet Trace 2500 back in the late 80s,
I wish they still made that puppy. The higher switching rates coupled with new PWM (pulse width modulation) schemes to create those tiny steps
introduce high frequency noise so the nice inverters have those filtering reactors but they tend to be heavy. I have seen tremendous changes and
improvements over the years. Today I install maintain and service 3 phase inverters producing up to 6MW with 1500 VDC inputs and 690 VAC outputs. We
step that up to 36,000 VAC and feed it into the grid. When looking for a good inverter that uses the marketing term "pure sine wave" You want to
look at the total harmonic distortion. Ideally it should be 3% or less, 5 is tolerable but above that is crap. Most inexpensive "pure sine
wave"inverters will not tell you this number they typically say something like "lower" THD
All of this to say that this $34 300 watt inverter should suit you fine.
https://www.amazon.com/BESTEK-300Watt-Inverter-Converter-Cha... I have two and they have served me well in all manner of instances. I don't know
the THD on it but it produces so little noise i can even run my O-Scope on it which is pretty sensitive to noise.
Good luck with the sleep apnea. Modern medical discovery's and improvements should be welcome. I wear a small continuous glucose monitor that lets me
see my sugar levels on my watch and a tiny pod that delivers insulin that I can easily adjust to customize my insulin delivery. These devices have
vastly improved my quality of life. Should I not bring them camping because real men in the 60's out in the boonies sucked it up and went comatose.
***k that.
[Edited on 28-6-2021 by Bajabus]
[Edited on 29-6-2021 by Bajabus]
"Preventive war was an invention of Hitler. Frankly I would not even listen to anyone seriously that came and talked of such a thing."
Dwight David Eisenhower
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Howard
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Posts: 2353
Registered: 11-13-2007
Location: Loreto/Manhattan Beach/Kona
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Mood: I'd rather regret the things I've done than regret the things I haven't done.
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What is wrong with some of you people?
For crying out loud, what if it extended your life and better living through modern inventions? Why do you think the average age for the living has
gone up and up over the decades/centuries? Is it just a coincidence that medicines and machinery have improved the quality of life? I think not, it's
no coincidence.
Your right, all users don't need a C-Pap and most probably do not need one to survive. The same case can be made for most medical inventions. However
if it improves your quality of life and extends your quality of life, why not?
Your right, society uses way to many things as a crutch as we are a lazy bunch of humans and looking for the easy way out. Why condemn the people who
actually benefit through modern science?
We don't stop playing because we grow old;
we grow old because we stop playing
George Bernard Shaw
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Bajabus
Senior Nomad
Posts: 892
Registered: 8-30-2002
Location: Elias Calles B.C.S. or NC USA
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Mood: My friends..it's good.
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Here I am with a 3.3 MW inverter in Utah's beautiful Milford valley
"Preventive war was an invention of Hitler. Frankly I would not even listen to anyone seriously that came and talked of such a thing."
Dwight David Eisenhower
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elgatoloco
Ultra Nomad
Posts: 4332
Registered: 11-19-2002
Location: Yes
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[/rquote]
Definitely an overuse of prescription drugs for people with so called depression especially kids who had to stay home last year.............a bit of a
crutch factor. Just saying.
*I don't use cpap and I don't need antidepressants. yet.
This we me making an inane comment about something I have no practical experience with and it makes me look like an ass, does it not? we can all agree
that I (we all) would be better served if I was to have kept my mouth shut about something I not little to nothing about rather then open it and sound
like a fool.
* I did do a sleep study at Scripps in 2019 with my wife in the interest of marital harmony. Turned out I scored slightly better and just under the
threshold for needing a cpap. In the last 18 months I have lost about 20 pounds and am more quiet in my sleep. If you know what I mean.
Better living thru chemistry. And science.
[Edited on 6-28-2021 by elgatoloco]
MAGA
Making Attorneys Get Attorneys
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willardguy
Elite Nomad
Posts: 6451
Registered: 9-19-2009
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Quote: Originally posted by JZ  | There definitely seems to be an over use of CPAPs in America.
Can't believe everyone needs one. A bit of a crutch factor going on.
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what a joke! lets talk a little about the "crutch factor" this from the self proclaimed "one of the top offroad GPS experts in the world" thats a
quote. here's a guy that obviously needs GPS to find his way from san diego to the coral hotel! now this azzhole is gonna school us on CPAP
machines??
gimme a break!
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willardguy
Elite Nomad
Posts: 6451
Registered: 9-19-2009
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Bucks crutch is the internet forum
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BajaNomad
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Thread Moved
6-29-2021 at 01:13 PM |
Alm
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| Quote: Originally posted by Santiago |
Unit's power supply is a 90W unit
Typical Power Consumption: 53W (57VA)
Peak Power Consumption: 104W (108VA)
If I did my math right, a 105 amp deep cycle should get me through 2 nights at 7 hours each? What I don't know is how much is lost inverting.
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You'll be fine with inverter rated 120W continuous power. Samlex is a decent brand: https://www.amazon.com/Samlex-PST-120-12-Pure-Inverter-Watts...
If you rely on specs, not measurements, they might say 104W for starting the motor, and then it turns out to be 150W. Maybe get
300W unit: https://www.amazon.com/Samlex-America-PST-300-12-Pure-Invert....
You don't need a bigger inverter if all you have is 105 AH battery.
Inverter losses can be 5-15%.
53W non-stop is 33 AH per 7 hours with inverter losses. Your battery should better be fully charged before the trip.
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landyacht318
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Posts: 247
Registered: 7-28-2007
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Does the C pap have a power brick?
If so, it will list an output DC voltage and amperage. Multiply output voltage times output amperage and than will give the maximum wattage the power
brickis rated to output continuously( in a lab), which can be different that what the C pap draws at any given time.
Powering a Cpap often comes up on RV related forums. The solution for those who don't already have an inverter, and more than enough a battery
capacity to power it, is the DC to DC converter, instead of using an inverter taking 12vdc, changing it to 115vac, only to have the powerbrick convert
115 vac to whatever DC voltage the Cpap uses.
Some cPaps have the 'car adapters' as as option. Please note that the ciggy plugs and 12v powerport/ ciggy plug receptacles and the wiring leading to
those receptacles is often super substandard. This ciggy plug/12v powerport connection, even when all is as good as it can be, is still substandard
and can work its way loose all too easily, and the more often it is asked to pass 50+ watts the more likely this is to occur, sooner.
a 2000 inverter powering a 53 watt load will be much less efficient than a 200 watt inverter powering the same load, and most inverters say they are
upto 85% efficient, but consider there to be a huge asterix with that statement which make it rarely attained.
a 2000 watt inverter turned on, yet powering nothing will draw ~ 20 watts, whereas a 200 watt inverter turned on, powering nothing will draw 3 to 6
watts from the battery. Not so much a factor in C pap usage unless one forgets to turn off the inverter after they wake up.
If one Knows the DC voltage the C pap is expecting to see, and it is not already in the 11.5 to 13.5 vDC range, then one can get a DC to DC boost/
step up converter and wire it up themselves, if they have some wiring skills and the desire to do so. 150 watt versions of Boost/ step up converters
can be had, slow boat from China, for as little as 3$, or 7$ from a US vendor.
I bought one and it works well, and has exceeded that 150 watt rating for far longer than ever intended, but I did install a 50mm fan atop the
heatsinks.
If the output voltage is less than 12vDC, then one gets a step down, buck converter, and these visually appear almost identical to the step up/ boost
converters.
There also exist step up/ step down, buck boost converters available, in several different wattage ratings but these are less efficient than a simple
buck or boost only converter.
The inverter is often seen as the solution to all problems, but their inefficiency, and noise, often can cause issues, especially when the charging
capability is not upto snuff, or the battery capacity and its remaining health are questionable/unknown.
Seek a premade DC to DC 'car adapter' or similar for your Cpap, if the ONLY thing you need an inverter for, is the Cpap.
Having an inverter for other things is of course useful, but don't expect to be powering a hair drier, and 'Pure' sine wave vs modified square wave
can be an argument with no end, as to what actually needs 'pure', vs which is 'just fine' with modified.
If you have some DIY skills and inclinations, then feeding the Cpap the required DC voltage is relatively easily accomplished.
Here is the first DC to DC step up boost converter that I found a link to.
https://www.amazon.com/Converter-Yeeco-Voltage-Regulator-Adj...
Note these claim to be upto 95% efficient, whereas most inverters claim upto 85%, and that does not include the inefficiency of the powerbrick which
came with the Cpap, which can be in the 80 to 85% range.
I mounted my 150 watt/ step up converter in an old ventilated gutted power supply transformer based power brick and modified it with a larger
fingertwist potentiometer voltage dial and voltmeter on it to easily change output voltage. some of them have a voltage potentiometer, as well as a
current limiting potentiometer as well, but the latter is unneeded for a cpap application. There are also some that come with input and output
voltage displays and buttons to change parameters and clear enclosures for not all that much more money.
I've found the smaller sub 60 watt boost or buck converters with the current limiting potentiometer to be less reliable than the voltage only
adjustment, but have had no issues with the 150 watt versions.
A PWR+ branded DC to DC 'car adapter' is powering this '90 watt' laptop, as I type this, and I got it over 10 years ago.
It is drawing on average, 32 watts, but if I use the original powerbrick, on my inverter, the laptop through tine inverter consumes an average of 47
watts, and I have to listen to the dang inverter fan. My powerbrick might run slightly hotter on my MSW inverter compared to when my PSW inverter
still worked.( wagan elite 400 watt PSW, avoid!)
I make extensive use of voltage buckers as speed controllers for powerful 12vDC fans, and as insanely bright LED dimmers, and in cases of 24vDC fans,
buck/boost converters. The main issues are that I wear out the cheap potentiometers and need to replace them every 2.5 years or so, though some Caig
Deoxit f5 fader Lube is often the cure, without replacement.
Anything which draws more than 25 watts, I do not use ciggy plugs, but cut them off and use Anderson powerpoles instead.
Usually upto 50 watts is OK with ciggy plugs/ receptacles, but failure is just a matter of time with such a poorly engineered, but ubiquitous,
electrical connector.
My 45 amp Anderson powerpoles have no issues passing 55 amps continuous, but I am shoehorning 8AWG into contacts which say 10AWG max.
Anderson Powerpoles are great connectors, but not perfect.
Use binder clips over their ends, to prevent ruining them when inevitably treating them like one does their 115 vAC connectors
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Santiago
Ultra Nomad
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Registered: 8-27-2003
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Turns out Resmed makes a DC brick, see here. I've ordered it and we will see. Thanks for the huge amount of info.
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GeraldoS
Banned
Posts: 15
Registered: 2-16-2021
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Every CPAP I have seen runs on 12v to 24v DC. The plug has a black box on it which is a transformer to step the voltage down from 120-240AC down to
12-24 volts and then a rectifier to convert the AC to DC. So, it does not matter how the sine wave looks on the AC side. It comes out as pure DC on
the other side which feeds the CPAP.
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