ResMed S9 with a battery?

[archangle]

The third pin (white wire) is to send a digital message to a chip in the CPAP. The chip in the CPAP identifies the message being sent from the inverter to validate that it is in fact a Res Med sanctioned power supply....So...unless you have a reader to capture the digital message and install it into a chip placed into the third party powersupply to send the correct message to the CPAP, there will be no solution but to buy a Res Med product.

As we say around here, someone needs a good, stiff beating.

[billbolton]

As we say around here, someone needs a good, stiff beating.

The third pin appears to be a static signal line which identifies to the S9 whether a 30W or 90W power supply is connected (effectivley disabling the Humidifier if only a 30W supply is connected). It definitely does not carry any "message", so glowbug is the one who needs your good, stiff beating

[archangle]

As we say around here, someone needs a good, stiff beating.

The third pin appears to be a static signal line which identifies to the S9 whether a 30W or 90W power supply is connected (effectivley disabling the Humidifier if only a 30W supply is connected). It definitely does not carry any "message", so glowbug is the one who needs your good, stiff beating

Great. Has anyone successfully powered an S9 without the ResMed converter?

[GumbyCT]

The third pin (white wire) is to send a digital message to a chip in the CPAP. The chip in the CPAP identifies the message being sent from the inverter to validate that it is in fact a Res Med sanctioned power supply....So...unless you have a reader to capture the digital message and install it into a chip placed into the third party powersupply to send the correct message to the CPAP, there will be no solution but to buy a Res Med product.

As we say around here, someone needs a good, stiff beating.

The third pin appears to be a static signal line which identifies to the S9 whether a 30W or 90W power supply is connected (effectivley disabling the Humidifier if only a 30W supply is connected). It definitely does not carry any "message", so glowbug is the one who needs your good, stiff beating

Someone needs to put an O'scope on that pin to figure out what is going on. This isn't rocket science. Anyone?

[Glowbug]

The third pin is NOT a static line but rather a DATA line and of course it can identify the supply. It transfers a DIGITAL ID to the CPAP so this could also identify the type. My information was validated with a scope before I posted FACTS.

Before you slam someone, you should at least know what you are talking about first. Attacking others that provide factual information is NOT helpful to those who want to learn the truth and not receive information that is not valid. It also shows your true colors.

[billbolton]

It transfers a DIGITAL ID to the CPAP so this could also identify the type.

If you are so certain that its a message, what is the content of the message, which way is it flowing, and what happens when it is interrupted?

Before you slam someone, you should at least know what you are talking about first.

Indeed

[GumbyCT]

The third pin is NOT a static line but rather a DATA line and of course it can identify the supply. It transfers a DIGITAL ID to the CPAP so this could also identify the type. My information was validated with a scope before I posted FACTS.

Before you slam someone, you should at least know what you are talking about first. Attacking others that provide factual information is NOT helpful to those who want to learn the truth and not receive information that is not valid. It also shows your true colors.

Perhaps you will share the freq. and any other info about the signal others might find helpful. Perhaps someone will find a work around.

[TxBobS]

I use this and my battery to run my S9 AutoSet. https://www.cpap.com/productpage/DC-Con ... hines.html

Seems like the best option.

[Glowbug]

It is a bi-directional line, the CPAP sends out a quarry, then has quiet time listening for a reply.



Anyone can hook a scope lead to the line and see the communication at start up.



It is easy to see if you have the CPAP hooked to a non approved supply because after start up the CPAP shuts down and continues to send quarries.



Easy to see digital wave form, did not try to decode the NRLZ digital word but could easily do so if it were useful to do so.



I could hook up an rs232 analyzer to the line and read the code and the return from a legal supply.

So...now that I have given you the methods in my original post what is going on with the white wire, anyone who wants to put the effort into it can build an after market power supply with the proper components and tools. I think the time invested (at least my time) would be better spent buying from ResMed.

If anyone has documentation on this wire that shows what I said is incorrect , please show me the correct answer as I would like to see how I misinterpreted the DATA. Otherwise, this is my last post on this subject as I am fearful of a "stiff beating".
Cheers

[GumbyCT]

So...now that I have given you the methods in my original post what is going on with the white wire, anyone who wants to put the effort into it can build an after market power supply with the proper components and tools.

If you have the tools needed to decode and analyze this signal it would be helpful and useful to those with Re$med products to know how to build their own power supply. I don't have the tools needed and have already made mine to work on any Respironics model.

I am fearful of a "stiff beating".

No need to be fearful. There are those who have sms or the "small mans syndrome".

They talk big behind a keyboard but my guess is if we were eye-to-eye, the "talk" would be a lot different.

[wohali]

about to pick up one of these machines, most likely - will do what I can for investigation on the line and report back. I'm sure I'll be spending the first week or two just adjusting to it...so please give me a bit of time before needling me

[JustMeee]

Anyone know what the output is on the S9 AC adapter?

It's 24Volts DC, at 90W max energy output level, so about 3.75A current, with a 3 pin connector to the flow generator.

There is going to be a 30W power supply available (within a few months I'm told) for running just the flow generator without a humdifier.

Cheers,

Bill

Does that mean if you are using the humidifier and the heated tube at max, like let's say your house heat is broken and it's very cold in the middle of winter, so the machine is working at MAX to keep the water warm and the air supply humid, then the max usage is 90W?

Using that same scenario where the machine must constantly work hard to humidify the air, does that mean a 300Wh lithium-ion battery supply will last for 3.33 hours?

Please let me know. Thank you very kindly.

[J4900]

I have a S9 VPAP Adapt (model 36007), running at IPAP of 15, with an H5i and would like to run it for 2-3 nights from battery power using the DC converter.

I am trying to figure out the needed battery capacity.

The ResMed battery guide that I have found (Oct 2011) does not seem to list my device. The closest is the "S9 VPAP Auto" but I'm not sure that is really accurate in terms of power consumption. For different but similarly named models the power depends on IPAP, EPAP, and treatment pressure so it seems like I need to be exact.

Any suggestions appreciated!

UPDATE

Last night I measured the power consumption with Kill-A-Wattz meter:
10 hrs, 0.16 KWH, so 160 watt/hours consumed
Assume converter is about as efficient as the 120 vac power supply
160 / 12 volts = 14 amp-hours for 10 hrs
1.4 amp-hr capacity per hour of use
12 amp-hours for 8 hr night

Seems reasonably close the numbers in the ResMed tables

[J4900]

I received this from technical support:

"It would use approximately 28 Amp hours. I attached a battery guide, look at page 20 for the S9 autoset CS, that is the Canadian version of the the S9 Vpap Adapt. Hope this helps."

I think this rep misread the table. IPAP and EPAP are different. According the SleepyHead, my EPAP is only 4.

For an EPAP of 5, an S9 AutoSet CS + H5i at setting 3, the table shows a current draw of 1.27 amps. This is pretty close to my measurement of 1.4 amps.

ResMed thus recommends 16 amp hours which supposedly includes "50% safety margin." I calculated 12 amp-hrs so adding 50% (6) it is all in the same ballpark of 16-18 amp-hours per night.

[J4900]

OK, now for batteries. It seems like "jumpstart" packs are popular because you get a sizable lead-acid battery and charging all in one package.

However, running a VPAP all night long is a "deep cycle" type of load. Since these packs are sold for jump starting, don't they contain a "starting" type battery that is optimized for brief starts and then recharging?

Just like the "starting" battery in a car, it seems like this would soon deteriorate if a steady load was applied for long periods between charges.

Or maybe the battery is a "marine" style that supports both steady loads (trolling) and high loads (starting the boat engine). As I understand it, a "marine" battery is a hybrid with both deep cycle and starting characteristics.

I am thinking I may buy a premium AGM battery and a Battery Minder to charge and maintain it.

http://www.bestconverter.com/12-volt-2- ... p_139.html

A large investment. Any suggestions appreciated.