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Old 11-10-2014, 19:33   #1
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Using a cpap machine on boat

I have a friend joining me for a couple days of sailing next weekend. If the weather cooperates, we will spend a night at anchor. My friend uses a cpap machine and I am wondering if anyone has experience using a cpap machine while on the house battery bank thru an inverter.


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Old 11-10-2014, 20:10   #2
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Re: Using a cpap machine on boat

Went on a delivery with a guy that used one. Everthing sould function normally, just like any other equipment or appliance, if your battery bank, inverter and charging capabilities can handle it. I'm not sure how power hungry they might be though.

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Old 11-10-2014, 20:38   #3
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Re: Using a cpap machine on boat

Holding tank and battery placement Mac 26D/S - Page 2 - SailboatOwners.com

Click on Sum's MacGregor link for more details, IIRC.

Should be OK if you have a big enough house bank, which you didn't explain at all.

Good luck.
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Old 11-10-2014, 20:52   #4
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Re: Using a cpap machine on boat

I used CPAP on my O'Day for two years. They barely draw any watts. Would suggest that you buy an inverter a little larger than what you need in case you need 110 for something else. Plan on direct wire to battery pole connection. The small clips provide very poor connection and often times fall off at the wrong moment. Al
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Old 11-10-2014, 21:35   #5
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Re: Using a cpap machine on boat

I use a CPAP, power consumption depends on the machine, if you use the humidifier it up to 60W, if there is a heated hose, even higher, so that is a lot of power.
However it's usually pretty humid on a boat of course, so he probably can do without the humidifier, the heated hose is to keep the water from condensing in the hose and raining as it's called in the mask
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Old 11-10-2014, 23:33   #6
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Re: Using a cpap machine on boat

Hi

Just got my cpap machine and it varies each night, but the most I used was 45 amp hours overnight running on the 1000W inverter with 400 amp hours in the battery bank. Best sleep for ages for both Captain and Admiral.

Cheers Sue
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Old 12-10-2014, 00:10   #7
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Re: Using a cpap machine on boat

Most of these units have an optional 12 volt plug in and there is no reason to need an inverter. If you go this route and don't turn the humidifier up too far you shouldn't use more than about 25 amp hours a night depending on the unit.
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Old 12-10-2014, 02:17   #8
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Re: Using a cpap machine on boat

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Originally Posted by sapient sue View Post
Hi



Just got my cpap machine and it varies each night, but the most I used was 45 amp hours overnight running on the 1000W inverter with 400 amp hours in the battery bank. Best sleep for ages for both Captain and Admiral.



Cheers Sue

Sue, that seems really rather a high figure. Most 12v units use less than half that unless they are set to a very high pressure. Any chance you are using an inverter to power a transformer that subsequently puts out 12v?

Also, most machines draw a significantly higher power initially to start the fan motor (up to 100 watts) before settling to less than 20 watts for the remainder of the evening, unless, as mentioned, a humidifier is in use.

For those that need to know it is possible to run these devices from something as small as a motorbike battery if you buy the correct machine.

Matt


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Old 12-10-2014, 02:53   #9
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Re: Using a cpap machine on boat

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Originally Posted by Silverbeard View Post
I have a friend joining me for a couple days of sailing next weekend. If the weather cooperates, we will spend a night at anchor. My friend uses a cpap machine and I am wondering if anyone has experience using a cpap machine while on the house battery bank thru an inverter.


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Thats exactly how I use mine. Even one of those jumper packs will run it for a night or two as they draw very little current
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Old 12-10-2014, 04:18   #10
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Re: Using a cpap machine on boat

My cpac supplier knows nothing. He claimed there was no such thing as a 12 volt machine. He is a lying liar who tells lies. I am in a new town and need a new machine too so we will see what the new guy says. Great thread guys and gals.
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Old 12-10-2014, 04:27   #11
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Re: Using a cpap machine on boat

Try these guys and then check Amazon as well and if Amazon is a little lower in price(which happens the odd time) then ask them to match the price, which the usually do. They will answer any detailed question you have. www.thecpapshop.com/
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Old 12-10-2014, 04:28   #12
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Re: Using a cpap machine on boat

Check out the Respironics Remstar M series if you don't need a humidifier. They are bullet proof, compact and use bugger all power.

My mate sells most of the brands and he keeps coming back to that one again and again.

No, I am not in the CPAP industry, but he has asked for my help a number of times on this very issue, as again and again he has clients who want to keep camping/sailing/bushwalking with their machine. We helped one guy do a 2000km bike ride with his setup, now THAT was a challenge.

We checked the power consumption on every make and model in his stock, and the Respironics was pretty well the best. Unfortunately that one has an external humidifier, and adding the humifier makes it less suitable for people on the move.
Scrub that, looks like the new models have built in humidifiers available... not sure about the power consumption on those though.

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Old 12-10-2014, 07:21   #13
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Re: Using a cpap machine on boat

Thanks everyone for your input. It's been helpful and given me a basic idea of what to expect. I have two batteries in the house bank that are 650 CCA each. I think that should be enough power.


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Old 12-10-2014, 09:10   #14
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Re: Using a cpap machine on boat

I use my cpap onboard. Have buddy pick up two battery packs from the cpap store. They come with a 12 volt transformer kit and the batteries are about 4" x4" nicad power packs. If the humidifier and hose are selected off, you will get roughly 2 days from a battery pack. 2 packs = 4 days. Recharge during the day while motoring. No need to wire up anything special. No need for an inverter.
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Old 12-10-2014, 13:14   #15
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Re: Using a cpap machine on boat

Humidifier is the power hog, what they are is a SS plate that is heated to evaporate the water, electric resistance heat is of course inefficient.
Mine is a Phillips Resperonics Remstar, on mine the humidifier is removable from the unit which is nice for traveling.
I believe the CPAP uses about as much electricity as the refrigerator
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