Can Omars powerbank of 100-230V, 90-120W support a 100-240V  0.3-0.5A  appliance

sunhux
sunhux used Ask the Experts™
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I have an electrical appliance (it's a CPAP machine) that's labelled its input power as:
100-240V, 0.3-0.5A, 50-60Hz

Can the Omars 40200mAh powerbank below support (ie power) the above CPAP?
https://www.ebay.com.sg/itm/283550204371?ul_noapp=true

From youtube url below, appears that Omars powerbank's AC output gives
110-230V, with amperage unspecified:
https://www.youtube.com/watch?v=b4QE44yEstI

Does the powerbank auto-adjust its amperage output??

Just don't want to burn / cause over-current to the CPAP machine as this
voids the warranty
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Top Expert 2014

Commented:
What voltage is used in your country?
AlexA lack of information provides a lack of a decent solution.

Commented:
Stupid question, why not just get a power bank from the manufacturers and not worry about voiding your warranty in the first place?
Top Expert 2014
Commented:
Answered my own question, Singapore 230v. Should be OK but it will have traveled more miles than I have done in my lifetime if you buy it from USA. Can't you get one from China where it's probably made?
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Top Expert 2016

Commented:
The power bank will not supply more current than the device draws. My question is why don't you just plug the CPAP machine into the wall.  Does it use a USB cable for power? Are you planning on flying and want to use the CPAP machine while in air?
The CPAP machine with a 100 to 240 VAC rating has a flexible, robust input.

The Power Bank AC is rated for 120 VAC and 90W.  That gives you a max current of 0.75 Amps, more than the 0.3 to 0.5 of the CPAP.

So all is sort of well.  But 42,000 mAH at 5 volts is only 210 Watt-Hours.  So you only have enough energy for 4 to 6 hours of operation.  And that assumes efficient power conversion.

Author

Commented:
> Can't you get one from China where it's probably made?
I've been hunting for one such DC to AC inverter in Asia but none found.

>The power bank will not supply more current than the device draws.
The current required by the CPAP is only 0.3-0.5Amp.  As for voltage,
the CPAP (a Spanish brand) can accept anything 100-240Volt.
Yes I'm travelling outdoor with the CPAP.

i know of cpap.com that sells powerbank that cost US$320 & you'll still
need to get a US$69 inverter to be able to support the CPAP model I have.
I reckon this Apex XT CPAP was imported by a local dealer here from USA.

>That gives you a max current of 0.75 Amps, more than the 0.3 to 0.5 of the CPAP.
Think the above answers my question.

Can I safely say it's the voltage that will burn/trip an appliance & not the amperage?


>But 42,000 mAH at 5 volts is only 210 Watt-Hours... for 4 to 6 hours of operation
I plan to get 2pcs of the Omars powerbank so that will give me at least 8 hours
tho I'll need to wake up in the night to switch over

Author

Commented:
>why not just get a power bank from the manufacturers and not worry about voiding your warranty
The manufacturer doesn't make one.    Well, I could have got the  Resmed CPAP as Resmed does make
a powerbank for it but Resmed is rare in my country & costs easily double of the Apex CPAP.

from cpap.com, it sells 3rd party powerbanks for the different CPAP that they carry but you'll need
to get their 150W sine wave DC-AC inverter.

My biggest concern is:  will Omars 40200mAh powerbank damage (over-current/trip) the Apex XT
CPAP.   This CPAP costs me about US$850 so can't afford to get another one.  If the powerbank
fails to power the CPAP, doesn't matter as I can use the powerbank for other purpose  &   I'll
skip using powerbank when I'm going outdoor.   My apnea condition is quite serious that even
with 9-10 hours of uninterrupted sleep, I can still doze off while driving.  This CPAP makes a big
difference to my 'awakeness'
Top Expert 2016

Commented:
The powerbank outputs DC, which if you go through an inverter you will have a loss as it takes energy to convert from DC to AC.  What you could use is a small UPS instead that already has the inverter built in and will be more efficient than the powerbank/inverter scenario you propose .  

What I'd be doing if it was me was see if the unit uses 12V internally and if it doesn't need line power but uses low voltage DC internally I'd wire in a jack
Top Expert 2014

Commented:
Have you reported this "doze off whilst driving" condition to the driver licensing authority?

Author

Commented:
>Have you reported this "doze off whilst driving" condition to the driver licensing authority?
It's recorded in the public hospital;  in the doctor's report.  The doctor shared a number of
taxi / cab drivers have this issue.

>The powerbank outputs DC, which if you go through an inverter you will have a loss as it takes energy to convert from DC to AC.
In the youtube link I've given above  (ie https://www.youtube.com/watch?v=b4QE44yEstI ) ,
it shows this Omars powerbank has an AC output port : reckon it has an inverter built-in

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