Schumacher SJ1 with AirSense 10 Autoset

[EagleJim471]

I do quite a bit of camping with the Boy Scouts and am new to my CPAP (as in I have only been on it for 2 nights so far). I have a ResMed AirSense 10 Autoset w Humidifier. I am not using any of the heated tubing, just the tubing that came standard with the machine. I do not want to pay $500 or more for the ResMed battery. I have been looking at a Schumacher SJ1 upon the recommendation of a friend with an older CPAP. However, I have never been a good decipherer of electrical speak, and the specs on the AirSense don't easily translate to the specs on the SJ1 for me. I am hoping someone can tell me if this would be an ample portable power source for my CPAP. All I need is a day or two of charge. When I camp longer times, it is almost always near an electrical source.

Specs from ResMed:
90W power supply unit
AC input range:100 – 240V, 50 – 60Hz 1.0 –1.5 A, Class II
115V, 400Hz 1.5A, Class II (nominal for aircraft use)
DC output: 24V 3.75A
Typical power consumption:
53W (57VA)
Peak power consumption:
104W (108VA

Specs for Shumacher SJ1
Peak Amps: 1200A
DC Power Outlet: 12V | 15A
AC Power Outlet: 120V | 1.7A
UBS Ports: 2A PER SIDE | 4A TOTAL
Converter: 120V, 60Hz; 200W continuous/400W peak
Coverter AC waveform: Modified sine wave

So, can I use this device safely for 1 or 2 nights? Should I go ahead and purchase the DC/DC converter from ResMed, and use the DC outlet, or am I just as well off using the standard 90W power supply with the AC power outlet? I would appreciate any and all advice. Thanks in advance.

[HoseCrusher]

IF Shumacher lives up to its specifications, the match looks reasonable.

A question for ResMed would be if the unit will operate properly using a Modified Sine Wave...

If not and IF the specifications are "real" the DC side should work.

[ChicagoGranny]

EagleJim471

Have a look at this thread - viewtopic.php?t=102775

CapnLoki seems to be the resident expert on batteries. If you have questions and post in that thread, he will probably respond.

[EagleJim471]

EagleJim471

Have a look at this thread - viewtopic.php?t=102775

CapnLoki seems to be the resident expert on batteries. If you have questions and post in that thread, he will probably respond.

Thanks. I'll give him a try.

[EagleJim471]

IF Shumacher lives up to its specifications, the match looks reasonable.

A question for ResMed would be if the unit will operate properly using a Modified Sine Wave...

If not and IF the specifications are "real" the DC side should work.

Thanks for the reply. I know the SJ1 is a lot heavier than the more expensive batteries made for CPAPs, but if I can get the same performance for a fraction of the price, I am willing to make the compromise.

[palerider]

IF Shumacher lives up to its specifications, the match looks reasonable.

A question for ResMed would be if the unit will operate properly using a Modified Sine Wave...

If not and IF the specifications are "real" the DC side should work.

there's nothing I see in those specs that says what the capacity of the unit is. it might work great, for 30 minutes.

[HoseCrusher]

Good catch.

It looks like the battery capacity is 18 amp hours. Back of the napkin calculation indicates that it would power that APAP unit for about 4 hours optimistically. Pessimistically about half that time. Realistically somewhere in the middle of those two.

[chunkyfrog]

Considering the cost of proprietary power supplies for my Resmed machine,
I went for the Intellipap Autoadjust, since it will run cheaply off any deep cycle 12 volt DC battery.
Buying into our hosts' generous bundling, I added a few items to my order, including a battery pack.
I spent more than the Resmed battery would have been, but I have a complete backup/travel setup.
Even more good news: my Airsense 10 machine has a completely different power receptacle from my S9.
Yeah, I'd bet a magic crystal there is no (reasonably priced) adaptor.

[archangle]

You will probably get more hours of usage with the ResMed 12V adapter than with the 120V output of the jumper battery. Unfortunately, I don't have enough information about the efficiency of the 120V inverter in the jumper battery. Gut feel is the penalty isn't too high. Maybe 20-30%, but that's just a gut feel.

Gut feel is that it will be borderline, but might run 2 nights. I have a similar Sears Diehard jumper system that ran my S9 for a short night with no problems. (I didn't run it all the way down.)

I think ResMed doesn't specifically say that A10 machines will run off of a modified sine wave source. They don't say it won't, but they don't say it will, the last time I checked. It's PROBABLY OK.

The machine will run longer if you don't turn on the humidifier. You can use it turned off with water in it and you'll get some humidity, or just leave the tank dry. There's an optional sideplate you can get to let you leave the water tank at home.

BTW, my S9 draws an average of less than 1 watt overnight even with humidifier.

Whatever you do, try it at home first.

[CapnLoki]

I do quite a bit of camping with the Boy Scouts and am new to my CPAP (as in I have only been on it for 2 nights so far). I have a ResMed AirSense 10 Autoset w Humidifier. I am not using any of the heated tubing, just the tubing that came standard with the machine. I do not want to pay $500 or more for the ResMed battery. I have been looking at a Schumacher SJ1 upon the recommendation of a friend with an older CPAP. However, I have never been a good decipherer of electrical speak, and the specs on the AirSense don't easily translate to the specs on the SJ1 for me. I am hoping someone can tell me if this would be an ample portable power source for my CPAP. All I need is a day or two of charge. When I camp longer times, it is almost always near an electrical source.

Specs from ResMed:
90W power supply unit
AC input range:100 – 240V, 50 – 60Hz 1.0 –1.5 A, Class II
115V, 400Hz 1.5A, Class II (nominal for aircraft use)
DC output: 24V 3.75A
Typical power consumption:
53W (57VA)
Peak power consumption:
104W (108VA

Specs for Shumacher SJ1
Peak Amps: 1200A
DC Power Outlet: 12V | 15A
AC Power Outlet: 120V | 1.7A
UBS Ports: 2A PER SIDE | 4A TOTAL
Converter: 120V, 60Hz; 200W continuous/400W peak
Coverter AC waveform: Modified sine wave

So, can I use this device safely for 1 or 2 nights? Should I go ahead and purchase the DC/DC converter from ResMed, and use the DC outlet, or am I just as well off using the standard 90W power supply with the AC power outlet? I would appreciate any and all advice. Thanks in advance.

There are several relevant factors:

First, the battery is about 18 Amp-Hours. If you want it to last, you shouldn't go much below 50% (20% is the "hard limit" but at that point the lifetime is compromised) so figure about 10 Amp-Hours as the "useful" charge. Next, the inverter efficiency is is about 60% so that brings you down to about 6 Amp-hours. (If you get the 12-24 volt converter you can save most of this hit.)

So how much do you use? I haven't measured a ResMed but the comparable Respironics is about 4-6 Amp-hours a night without humidity. Even minimal humidity can easily double or triple this, so unless you're camping in the desert just forget about humidity. Bottom line, this system is good for about one night. With the converter you might stretch it to two nights.

As an alternative, I would suggest the system in the last post of this thread:
viewtopic.php?t=102775
The battery is same type as the in the Shumacher, but twice as large.The charger is high quality. You should get the 12-24 converter so you'll have plenty of power, enough for several nights, or enough to serve as power failure backup at home. The weight of the battery is about the same as the Shumacher.