CPAP on battery power issues? - Page 6 - Fiberglass RV


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Old 09-26-2014, 09:32 AM   #71
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Here is a link to the new version of my model Resmed CPAP: ResMed - S8 Escapeâ„¢ It states "12V or 24V DC input—broad application", whatever that means.
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Old 09-26-2014, 02:13 PM   #72
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I've got an S9... no 12V. Sigh.
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Old 09-26-2014, 10:25 PM   #73
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Smile My experience

I used a CPAP for a few years, even running an extension cord into the tent when camping.
I dieted, lost 20 pounds, and haven't needed the CPAP since.
YMMV
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Old 09-28-2014, 08:35 PM   #74
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Originally Posted by fusedlight View Post
I've got an S9... no 12V. Sigh.
I have same machine and have been using this dc cord for at least 2 years.

CPAP.com - DC Converter 24V 90W For S9 Machines
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Old 09-29-2014, 08:57 AM   #75
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Originally Posted by Roger C H View Post
I dieted, lost 20 pounds, and haven't needed the CPAP since.YMMV

Yeah, well there is that I suppose.<_< I think this thread contains some valuable information particularly about the 24V or 12V issue. If one knows their preferences going in they can ask questions about what device is being spec'd for them and try for a 12V machine if available. I do think that before I spent $85 on a 12V to 24V inverter I would just run it on a $30 12V to 120V Inverter. This is the one Resmed recommended to me: http://www.amazon.com/Tripp-Lite-PV1...+lite+inverter. That way I would have an inverter I could use for other stuff too. This is a small, efficiently sized (no fan) inverter and the CPAP does not seem to draw much juice anyway.
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Old 09-29-2014, 09:19 AM   #76
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I tried an inverter first before I got the 12v-24v cord and it killed the battery pretty quick, in a few hours. They use up a lot of battery converting DC to AC.

On a good group 27 battery the cord gets me through at least 3 nights or so. I can go for a weekend not worrying if the battery will die. And if I shut off the water heater on the cpap, much longer.
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Old 09-29-2014, 09:33 AM   #77
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Originally Posted by Vtec View Post
I tried an inverter first before I got the 12v-24v cord and it killed the battery pretty quick, in a few hours. They use up a lot of battery converting DC to AC.

On a good group 27 battery the cord gets me through at least 3 nights or so. I can go for a weekend not worrying if the battery will die. And if I shut off the water heater on the cpap, much longer.
The heated humidifier must be the issue. I quit using my humidifier long ago and never tried it that way on the inverter. I guess living in a high relative humidity environment has some benefit.
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Old 09-29-2014, 09:46 AM   #78
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Originally Posted by Timber Wolf View Post
The heated humidifier must be the issue. I quit using my humidifier long ago and never tried it that way on the inverter. I guess living in a high relative humidity environment has some benefit.

Well, good luck with the inverter, let us know how it works out. For me all it did was kill the battery even with the water heater turned off. Spending the bucks on the cord was a far cheaper route as I got nearly 3 years and counting out of it. The battery packs they sell for them are in the hundreds and I am just using my boat batteries. If I am in the camper, I am not in the boat.
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Old 09-29-2014, 10:20 AM   #79
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Well, good luck with the inverter, let us know how it works out.
It works fine and I was not speculating but "telling you what I know". I would NOT post recommending something I did not know for a fact worked (without a disclaimer). As I stated, this IS the inverter that Resmed recommended (for my machine, an S8). I have used it, it works fine and no undue battery draw was noted. In fact it drew much, much less than the math (machine amps) would indicate. Your mileage obviously varies.

Here is a link to an interesting Resmed document on the topic that lists several machine models: http://www.resmed.com/br/assets/docu...de_glo_eng.pdf
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Old 09-29-2014, 11:01 AM   #80
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Timber, glad it worked for you. I read the same pamphlet, got a modified wave inverter as recommended and used up my battery too fast. Your inverter could very well be much more efficient than mine was. As stated from page 9 of the Resmed link you posted:

Why use a converter?
• The converter is more efficient than an inverter.
• The converter provides electrical protection to the flow generator in the event that the adapter
leads are connected incorrectly to the battery.
• The converter provides regulation of the battery voltage: a fully charged battery has a terminal
voltage of 13.5 volts and will reduce as the battery is discharged.
• The converter will shutdown automatically when the voltage drops below 10.5 volts for a 12 volt
battery, or 21 volts for a 24 volt battery. This will protect the battery from damage due to being
allowed to fully discharge.
• The converter provides electrical isolation to the flow generator.

I am always at non-electrical sites so find the cord was the way to go. Would have saved the cost of the inverter I no longer have a use for.
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Old 09-29-2014, 03:18 PM   #81
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Originally Posted by Roger C H View Post
I used a CPAP for a few years, even running an extension cord into the tent when camping.
I dieted, lost 20 pounds, and haven't needed the CPAP since.
YMMV
I doubt for those of us with COPD or Pulmonary Thrombosis, that comment is much help. True Sleep Apnea, which is a neurological disorder, can hit really skinny people too and losing 20 lbs isn't really much of an option. Thanks for the information.
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Old 09-29-2014, 04:23 PM   #82
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Originally Posted by Vivian Layne-Parkin View Post
I doubt for those of us with COPD or Pulmonary Thrombosis, that comment is much help. True Sleep Apnea, which is a neurological disorder, can hit really skinny people too and losing 20 lbs isn't really much of an option. Thanks for the information.
Roger was speaking of obstructive sleep apnea which is a physical or anatomically caused syndrome. Weight loss helps reduce the causes.
Central apneas are caused by non physical ways, and are not usually treated with CPAP. Sometimes central apneas can be exagerated by CPAP use. CPAP merely keeps your airway inflated so It can't flap shut when inhaling.
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Old 10-02-2014, 07:20 AM   #83
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Has anyone looked at the Renogy Monocrystalline 100W Solar Panels?
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Old 10-02-2014, 08:23 AM   #84
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Originally Posted by Vivian Layne-Parkin View Post
Has anyone looked at the Renogy Monocrystalline 100W Solar Panels?
I have two, and one more on the way I bought last week. I have not actually used them yet, but they look OK. I plan to mount two on the roof of the Scamp and keep one portable. I suggest shopping around. I bought my first panel as part of a kit with a 20A MPPT controller and assorted bits (mounts, wire) off ebay with free shipping from Renogy. The next two panels I also bought off ebay from Renogy with free shipping on a couple of different occasions. By adding them to my "Watch List" I could see when they "put them on sale" and paid $129 each instead of the $150 or so regular price. Also, by getting on Renogy's site I am on an e-mail list and they send out %5 or 10% off deals occasionally. I still have not found it cheaper than buying off ebay. They also list on Amazon if that is your preference.
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