Hello Guest, Welcome to Apnea Board !
As a guest, you are limited to certain areas of the board and there are some features you can't use.
To post a message, you must create a free account using a valid email address.

or Create an Account


New Posts   Today's Posts

Maxoak K2 battery question
#1
I  recently purchased a maxoak k2 battery and a 12v to 24v converter to power my cpap when I go camping this summer. When I plug into the 12v port on the battery my cpap won't turn on but when I plug into the 20v port the cpap turns on and run fine. Is it ok to use the 20v port? Shouldn't the cpap work when I plug into the 12v port? Dont-know
Post Reply Post Reply
#2
You are using the ResMed Airsence 10 AutoSet correct?

The converter you use should be the proprietary one made for your machine by ResMed. This machine is a 24 VDC machine; plus has a 3rd wire that must carry a correct V and series R to handshake with the machine. The machine has a triaxial power socket.

Question: Whose converter are you using?

Input to their converter can be 12 to 24 Volt DC.

Most people are using 12 VDC SLA/AGM batteries.
INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
Post Reply Post Reply
#3
Your post indicates you're using the Resmed 12/24 converter. The MaxOak has two output ports
1 DC OUT (12V/2.5A Round Port)
1 DC OUT (20V/3A Round Port)

These are marginal in amps output to start the CPAP. We were using a Poweradd Pilot Pro 320000 mAh that had 4.7 amp 12 volt output and it did pretty good, but is apparently discontinued. I'm surprised you are able to run on the 20V 3A output port. This one makes me a bit nervous for warranty purposes.
Post Reply Post Reply


#4
Sleeprider is correct. As you need over twice the current from a 12V supply to run the 24V ResMed. (Over twice because of conversion loss.)

We could also look at this from a power point of view:
DC OUT (12V/2.5A Round Port) = 30 Watts
DC OUT (20V/3A Round Port) = 60 Watts

The regular AC line powered brick is a 90 Watt supply.
INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
Post Reply Post Reply
#5
I got the BPS 24v power converter for Resmed air 10 & s9 series devices. Specs say input:12v dc output: 24v/3.75a max.
Post Reply Post Reply
#6
That's not a genuine ResMed converter.

Most often used is ResMed part number 37297:
[Image: Accessories_Air-10-DCNADC_converter_heroimage.jpg]
INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
Post Reply Post Reply


#7
The resmed batterie$$$ are 3.75 amp power sources. So any Li-ion power bank that can match that should work. Most of them are intended to power portable devices and have a maximum 2.5 amp output. 12 volts at 3.75+ is what is needed when used with the 12/24 converter, or directly with any 12-volt Philips CPAP. The actual demand of the CPAP is usually less than 1-amp when operating, but startup is generally higher.
Post Reply Post Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  Battery Back up for Airsense 10 Matzaball2016 8 901 08-05-2017, 09:42 PM
Last Post: OMyMyOHellYes
  Pilot-24 CPAP Battery System from Medistrom sonicboom 16 6,286 08-05-2017, 09:25 PM
Last Post: OMyMyOHellYes
  Battery backup for Dreamstation speed3914 21 624 07-29-2017, 05:23 PM
Last Post: speed3914
  Phillips Respironics Go Auto CPAP with Battery Pack David Govan 3 233 07-29-2017, 08:07 AM
Last Post: loganpass
  Measuring current draw on CPAP for battery calcuilations OMyMyOHellYes 17 721 07-23-2017, 08:57 AM
Last Post: OMyMyOHellYes
  Battery usage, while camping hansk 78 3,859 07-12-2017, 12:56 PM
Last Post: OMyMyOHellYes
  Battery setup Jrw1 13 558 06-27-2017, 08:49 AM
Last Post: Jrw1

Forum Jump:

New Posts   Today's Posts




About Apnea Board

Apnea Board is an educational web site designed to empower Sleep Apnea patients.

For any more information, please use our contact form.