| need a cheap quiet inverter to run a CPAP [message #364891] |
Tue, 22 June 2021 11:01  |
hertfordnc
Messages: 1164
Registered: September 2009
Location: East NC
Karma: 0
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Going camping with the scouts for a week, one of the other leaders needs his CPAP to run. There is no AC power as far as i know but i have a bunch of gel cells- about 500 amps worth.
The CPAP draws 90 watts so theoretically i should be able get him through four nights.
So i'm in the market for an inverter. So many choices. I could probably get by with 300watts but i'd prefer to have a bigger one for future use. i'm looking for one that either does not have a fan or only runs the fan as needed.
I have a nice 500 watt Vector but the fan runs constantly, it's annoyingly loud and it can't be very efficient.
Dave & Ellen Silva
Hertford, NC
76 Birchaven, 1-ton and other stuff
Currently planning the Great american Road Trip Summer 2021
It's gonna take a lot of Adderall to get this thing right.
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| [GMCnet] Re: need a cheap quiet inverter to run a CPAP [message #364892 is a reply to message #364891] |
Tue, 22 June 2021 11:14  |
Patrick Flowers
Messages: 195
Registered: February 2004
Karma: -24
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I have a 200W Harbor Freight inverter that I keep around for power
outages to run my CPAP. Their web site shows it on "Clearance"
https://www.harborfreight.com/200-watt-continuous-power-inverter-66967.html
On 2021-06-22 12:01, dave silva wrote:
> Going camping with the scouts for a week, one of the other leaders
> needs his CPAP to run. There is no AC power as far as i know but i
> have a bunch
> of gel cells- about 500 amps worth.
>
> The CPAP draws 90 watts so theoretically i should be able get him
> through four nights.
>
>
> So i'm in the market for an inverter. So many choices. I could
> probably get by with 300watts but i'd prefer to have a bigger one for
> future use. i'm
> looking for one that either does not have a fan or only runs the fan
> as needed.
>
> I have a nice 500 watt Vector but the fan runs constantly, it's
> annoyingly loud and it can't be very efficient.
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Patrick Flowers
GMCnet Listmaster
'73 CanyonLands
Tyrone, GA
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| [GMCnet] Re: need a cheap quiet inverter to run a CPAP [message #364893 is a reply to message #364892] |
Tue, 22 June 2021 11:21 |
GMC.LES
Messages: 505
Registered: April 2014
Karma: -2
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Senior Member |
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Many of the CPAP machines run on DC power, and use a power supply to convert household power to the required DC voltage. My Philips CPAP has a special 12VDC power cable that was quite reasonable to purchase.
Since some electronics do not play well with modified syne inverters, I suggest you consider the 12v direct option if it’s available. it eliminates the unnecessary additional power drain of an inverter running all night, and risk of damage to the medical device(CPAP) from modified syne is eliminated.
Les Burt
Montreal
'75 Eleganza 26'
> On Jun 22, 2021, at 12:14 PM, patrick@gmcmotorhome.com wrote:
>
> I have a 200W Harbor Freight inverter that I keep around for power outages to run my CPAP. Their web site shows it on "Clearance"
>
> https://www.harborfreight.com/200-watt-continuous-power-inverter-66967.html
>
>> On 2021-06-22 12:01, dave silva wrote:
>> Going camping with the scouts for a week, one of the other leaders
>> needs his CPAP to run. There is no AC power as far as i know but i
>> have a bunch
>> of gel cells- about 500 amps worth.
>> The CPAP draws 90 watts so theoretically i should be able get him
>> through four nights.
>> So i'm in the market for an inverter. So many choices. I could
>> probably get by with 300watts but i'd prefer to have a bigger one for
>> future use. i'm
>> looking for one that either does not have a fan or only runs the fan
>> as needed.
>> I have a nice 500 watt Vector but the fan runs constantly, it's
>> annoyingly loud and it can't be very efficient.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| Re: [GMCnet] Re: need a cheap quiet inverter to run a CPAP [message #364895 is a reply to message #364893] |
Tue, 22 June 2021 11:34 |
hertfordnc
Messages: 1164
Registered: September 2009
Location: East NC
Karma: 0
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Senior Member |
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GMC.LES wrote on Tue, 22 June 2021 11:21Many of the CPAP machines run on DC power, and use a power supply to convert household power to the required DC voltage. My Philips CPAP has a special 12VDC power cable that was quite reasonable to purchase.
Since some electronics do not play well with modified syne inverters, I suggest you consider the 12v direct option if it’s available. it eliminates the unnecessary additional power drain of an inverter running all night, and risk of damage to the medical device(CPAP) from modified syne is eliminated.
Yes, that would have been my first choice. It looks like it needs 24VDC. But this is a guy who did not know what an inverter was until i told him so he'd probably not want me hacking his machine.
Dave & Ellen Silva
Hertford, NC
76 Birchaven, 1-ton and other stuff
Currently planning the Great american Road Trip Summer 2021
It's gonna take a lot of Adderall to get this thing right.
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| Re: need a cheap quiet inverter to run a CPAP [message #364909 is a reply to message #364891] |
Tue, 22 June 2021 19:04 |
blur911
Messages: 166
Registered: December 2020
Location: Kingston, Ontario
Karma: 4
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The problem with some inverters is that they shut off at low DC voltage so might not give you as much time as you'd think if you can't recharge the battery.
I have a 300W inverter like that and it's a PITA depending upon your situation and battery.
Burl Vibert
Kingston, Ontario
1976 GMC 26 foot, Sheridan reno, don't know original model but we call her Roxie
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| Re: need a cheap quiet inverter to run a CPAP [message #364919 is a reply to message #364891] |
Wed, 23 June 2021 08:21 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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If you go inverter go true sine wave. Logic would say that square wave is less efficient as the square parts of wave only produces heat, not energy transfer when feeding a motor or transformer in the downstream device. There is usually a pretty good selection at Northerntool. Where in most cases you want extra headroom, in this case I would size not more than 150% max draw to get the most run time. Less is more here.
John Lebetski
Woodstock, IL
77 Eleganza II
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