UPS for a resmed 9

Hi Everybody

I live in Thailand and short power outages happen a bit . I have a spare UPS unit that I used for my PC thats rated to 500 w

My question is can my s9 machine plug directly into this unit and not blow up my cpap ?

zoran wrote:Hi Everybody

I live in Thailand and short power outages happen a bit . I have a spare UPS unit that I used for my PC thats rated to 500 w

My question is can my s9 machine plug directly into this unit and not blow up my cpap ?

In the US a 500 watt UPS would have a 7 Amp-Hour battery, an inverter to create 120 V AC, and a battery charger. It can carry a cpap for 30 minutes to several hours,depending on settings and humidifier use.

If you have a link to an English web site I can double check the specs.

CapnLoki wrote:

zoran wrote:Hi Everybody

I live in Thailand and short power outages happen a bit . I have a spare UPS unit that I used for my PC thats rated to 500 w

My question is can my s9 machine plug directly into this unit and not blow up my cpap ?

In the US a 500 watt UPS would have a 7 Amp-Hour battery, an inverter to create 120 V AC, and a battery charger. It can carry a cpap for 30 minutes to several hours,depending on settings and humidifier use.

If you have a link to an English web site I can double check the specs.

EDIT I dont use a humidifier

Hi thanks
if you scroll 3/4 of the way down this page there are specs. Its the MD-1000v

http://www.11street.co.th/product/Produ ... %20Company

And this is from the company website

http://www.powermatic.co.th/PD_5_1_114/ ... md_series/
Features :
• Line Interactive With Stabilizer Design
• Fully Digitized Microprocessor Controlled
• Automatic Voltage Regulator for Boost & Buck
• Input Voltage 220 Vac +/- 25% (165-275 Vac)
• Output Voltage 220 Vac +/- 10% (AVR Mode) และ 220 Vac +/- 5% (Battery Mode)
• Battery back up 10-30 minutes (depending on the peripherals)
• Can charge the battery and run faster than normal
• Auto-restart while AC is recovering
• LCD panel forcomprehensive Display : AC Mode, Battery Mode, Load Level, Battery
• Level, Input Voltage, Output Voltage, Overload, Fault and Low Battery
• Internet Surge Suppression
• Surge, short circuit, and overload protections
• Built-in USB Communication Port for ViewPower Software
• Body made of high quality plastic 100% electric shock or leakage (Except MD-1500S และ MD-2000Y)
• Standards and Approvals : ISO 9001, ISO 14001 & TIS. 1291 Part 1-2553, TIS. 1291 Part 2-2553, TIS. 1291 Part 3-2555

Will be able to just plug the machine straight into the UPS without using a convertor?

This looks similar to UPS units that have a 7AH battery. Running through an inverter it should power a S9 for 2 to 3 hours.

CapnLoki wrote:This looks similar to UPS units that have a 7AH battery. Running through an inverter it should power a S9 for 2 to 3 hours.

Excuse my ignorance , does that mean I have to buy an Invertor?

Guest wrote:

CapnLoki wrote:This looks similar to UPS units that have a 7AH battery. Running through an inverter it should power a S9 for 2 to 3 hours.

Excuse my ignorance , does that mean I have to buy an Invertor?

No, the UPS has an inverter (as well as a charger) built in. That's why you can plug directly into it. The issue is that inverters are typically 60% efficient, so a larger battery is needed. The other approach is to use the ResMed DC-DC converter, which is 90% efficient and connects directly to a 12V battery, which can be as big as you need. This would be preferred if the expected power failures are longer than a few hours.

I think pretty much any UPS can power a CPAP without difficulty for a few minutes. I don't think it would damage the machine. If so, then I've been playing devil's advocate with mine.

A few weeks ago, a severe thunderstorm caused us to lose power during the night for 2 hours. I never knew until my alarm went off at its normal time to wake me up at 7 am. I realized then the power had been off for 2 hours. Prior to using a UPS, I remember waking up one night nearly suffocating because the power went out and my CPAP stopped working -- nothing like a mask on your face with difficulty moving air through it to wake you up.

If you are prone to power outages, then a UPS is a perfect solution. If your power outage lasts many hours normally, then it is not a long-term solution. But if you lose power for 15 minutes or an hour you should be fine. Get a larger UPS if you want more run-time.. the home use models are pretty dinky, but you can get something with a perfect sine wave that will probably run your CPAP w/ humidifier for hours for a few hundred dollars.
I rarely lose power at home so I do not use a UPS. But I did lose power once in a hotel and I woke up instantly.. if that was the "norm" then I would definitely buy a UPS.

IMHO if your cpap will work on DC buy the DC cord for your cpap and hook it up to a battery. It will last much longer when the power goes out and can be used for other things like camping, etc. If it doesn't work on DC buy one that does.
There are many more things about a UPS that make it a poor choice for this application. Not to mention it just will not last long once the power goes out. A UPS is designed to smooth out commercial power so it doesn't cause a computer to fail and/or supply AC power long enuff to shut the computer down logically should the commercial power fail while the computer is in operation. They do not sustain long enuff to get a good nites sleep.

xxyzx wrote:

CapnLoki wrote:

Guest wrote:

CapnLoki wrote:This looks similar to UPS units that have a 7AH battery. Running through an inverter it should power a S9 for 2 to 3 hours.

Excuse my ignorance , does that mean I have to buy an Invertor?

No, the UPS has an inverter (as well as a charger) built in. That's why you can plug directly into it. The issue is that inverters are typically 60% efficient, so a larger battery is needed. The other approach is to use the ResMed DC-DC converter, which is 90% efficient and connects directly to a 12V battery, which can be as big as you need. This would be preferred if the expected power failures are longer than a few hours.

=========

the ups is closer to a square wave than a pure sine wave
is there risk of damage to the xpap power supply from that

No, the general opinion is that devices that run on DC fed by power bricks work fine with modified square wave. I've run many devices with MSW inverters and only had trouble with one power tool.

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Pap-Daddy wrote:IMHO if your cpap will work on DC buy the DC cord for your cpap and hook it up to a battery. It will last much longer when the power goes out and can be used for other things like camping, etc. If it doesn't work on DC buy one that does.
There are many more things about a UPS that make it a poor choice for this application. Not to mention it just will not last long once the power goes out. A UPS is designed to smooth out commercial power so it doesn't cause a computer to fail and/or supply AC power long enuff to shut the computer down logically should the commercial power fail while the computer is in operation. They do not sustain long enuff to get a good nites sleep.

You're absolutely right, except that some people have 10 minute outages frequently. For them a UPS works fine. Wiring up a battery is not for everybody. BTW, a jump starter does essentially the same thing with a battery 2-3 times the size. You can get one with a DC outlet for more efficiency. But if a UPS does the job, that's fine.

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CapnLoki wrote:a jump starter does essentially the same thing with a battery 2-3 times the size. You can get one with a DC outlet for more efficiency.

You are absolutely right and that would be my preference to using a UPS for a cpap. With the jump starter look for the largest battery (in amps) you can find. That should give you at least one full nite using the cpap w/o the alarms which this UPS is not likely to do.
Whether your outage is 2 min., 10 min., or 8 hrs a jump starter would be a better choice when using the DC portion to power your cpap. Some of the jump starters will come with an AC converter but I would still use the DC connection for cpap.

Pap-Daddy wrote:

CapnLoki wrote:a jump starter does essentially the same thing with a battery 2-3 times the size. You can get one with a DC outlet for more efficiency.

You are absolutely right and that would be my preference to using a UPS for a cpap. With the jump starter look for the largest battery (in amps) you can find. That should give you at least one full nite using the cpap w/o the alarms which this UPS is not likely to do.
Whether your outage is 2 min., 10 min., or 8 hrs a jump starter would be a better choice when using the DC portion to power your cpap. Some of the jump starters will come with an AC converter but I would still use the DC connection for cpap.

Except, twice the cost and the DC converter almost doubles it again. The best solution for some is not the best for all.

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CapnLoki wrote:The best solution for some is not the best for all.

While that is true it also depends on the goal.
I don't think you will find or want to pay for a UPS that will run a cpap for 8hrs. If power goes off often why would you want alarms go off then you wake-up and don't sleep any way. You haven't accomplished a thing. Well except you will know when the power even dips. Not my idea of sleep friendly setup.

However, as earlier suggested, IF you want to sleep thru any power interruptions a jump starter is the way to go.

CapnLoki wrote: BTW, a jump starter does essentially the same thing with a battery 2-3 times the size.

ContraryLoki wrote:

CapnLoki wrote:The best solution for some is not the best for all.

While that is true it also depends on the goal.
I don't think you will find or want to pay for a UPS that will run a cpap for 8hrs. If power goes off often why would you want alarms go off then you wake-up and don't sleep any way. You haven't accomplished a thing. Well except you will know when the power even dips. Not my idea of sleep friendly setup.

However, as earlier suggested, IF you want to sleep thru any power interruptions a jump starter is the way to go.

You must understand that the "alarm" is generally configurable.

I'm not debating any of the technical issues, only the concept that one size fits all. For me the jump starters are a bad solution because they won't go a full night, while a U1 battery will, with plenty to spare. Actually I already had the charger and wires, so adding a U1 battery seemed like a no brainer. It's been used for a variety of purposes more than as a cpap supply. If I had a UPS for other purposes (I actually do) then I might ask if it would work to protect against short outages. The jump starters always seemed to be cheaply made with mixed reviews, so rather then occupying the "sweet spot" to me they are "neither fish not fowl." Actually all of these solutions are the same, differing in battery size and some configuration points; each is a reasonable solution for some.