Choosing a Battery

General Discussion on any topic relating to CPAP and/or Sleep Apnea.
chrispina
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Location: Texas, USA

Re: Choosing a Battery

Post by chrispina » Tue Jul 06, 2021 6:43 pm

Sorry if this has been asked and answered. I tried searching the forum, but it says "KFD" isn't enough characters for the search.

Short version: does anyone have experience with the KFD brand DC Converter for the Airsense 10?

Long version:

We live in Texas, where the power grid has been somewhat unreliable lately and after a really miserable night without a CPAP, we wanted a backup option. He was using a Resmed s9 and after my research, we decided that step 1 would be getting his CPAP replaced since it was many years old and discontinued. I didn't want to spend $85 on a converter for the s9 that we were planning to replace ASAP, so I chose a battery option with both 12V DC and pure sine wave AC output that would work with or without a converter. I grabbed a Jackery 300 on sale for $270 (https://www.amazon.com/dp/B082TMBYR6/). We got the Airsense 10 today, so I want to get the DC/DC converter.

There is an aftermarket converter made by KFD available for $37. For the s9, there were only 32 reviews. They were good reviews, but I wasn't convinced. For the Airsense 10, there are 1000+ good reviews (https://www.amazon.com/dp/B07P6H994Q/). There are some bad reviews, but maybe half of those were from people who bought the wrong thing.

This will be a just in case item. We have no plans to camp or spend nights without power on purpose. The battery will be sitting on our bedroom floor while in use. We are indoor people. :)

If I really need to spend more than twice as much for the Resmed branded converter, I will, but I would rather not if the only real difference is the name on the box. I don't need the battery terminal connectors. We will still have the AC output available if needed. Trying to do a cost/benefit analysis here and some personal experience would help.

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SleepGeek
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Re: Choosing a Battery

Post by SleepGeek » Tue Jul 06, 2021 9:09 pm

I have not used a KFD. But IMO if you are using a Resmed Airsense 10 series you should try it and let us know. Amazon is known for their famous return policy so if it doesn't work you can get a refund.

I would not advise using any converter as that will deplete the battery much faster. All the AC power cords for ALL cpaps do is to convert the AC to DC to be used in the cpap. So to go from DC to AC then back to DC (for cpap use) makes no sense IMO.
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chrispina
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Location: Texas, USA

Re: Choosing a Battery

Post by chrispina » Tue Jul 06, 2021 10:52 pm

Yeah that's why I want the DC converter. I want to get the most out of the battery.

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palerider
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Re: Choosing a Battery

Post by palerider » Tue Jul 06, 2021 11:50 pm

chrispina wrote:
Tue Jul 06, 2021 6:43 pm
Sorry if this has been asked and answered. I tried searching the forum, but it says "KFD" isn't enough characters for the search.
Go to google, or your choice of search engine, and use 'site=cpaptalk.com kfd' as your search (without quotes.)

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chrispina
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Re: Choosing a Battery

Post by chrispina » Wed Jul 07, 2021 11:37 am

Never found much info on the KFD, but did find a 20% off deal through our employee benefits program, so I ordered the OEM converter. Thanks!

Buddy0329
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Re: Choosing a Battery

Post by Buddy0329 » Wed Jul 14, 2021 7:03 pm

Analysis paralysis time. I ordered the Resmed DC-DC converter for my AS10. Trying to figure out the battery thing now. I read through JohnBFisher's excellent DIY thread and been trying to learn:

Options:
  • AGM SLA 12v battery 35ah - 55ah = $80 - $150. Plus charger & battery box.
  • LifePO4 12v battery 30ah - 50ah = prices all over the map, from $175 up to $500. Plus charger & battery box.
  • Portable solar "generator" dozens of these imports on Amazon (Jackery Bluetti, etc). 300WH - 700WH can be had for $250 - $500. Higher end ones are LifePO4 not Lithium Ion. Nothing to put together, includes USB ports, and built- in AC inverter. Safer?
Thoughts?

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ChicagoGranny
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Re: Choosing a Battery

Post by ChicagoGranny » Thu Jul 15, 2021 7:15 am

Buddy0329 wrote:
Wed Jul 14, 2021 7:03 pm
Thoughts?
Calculate the AH you want - https://document.resmed.com/en-us/docum ... lo_eng.pdf

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Re: Choosing a Battery

Post by Buddy0329 » Thu Jul 15, 2021 8:54 am

ChicagoGranny wrote:
Thu Jul 15, 2021 7:15 am
Buddy0329 wrote:
Wed Jul 14, 2021 7:03 pm
Thoughts?
Calculate the AH you want - https://document.resmed.com/en-us/docum ... lo_eng.pdf
Looking for more of a discussion on the merits, safety, longevity of DIY versus pre-built, and battery chemistry..

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palerider
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Re: Choosing a Battery

Post by palerider » Thu Jul 15, 2021 12:25 pm

Buddy0329 wrote:
Thu Jul 15, 2021 8:54 am
ChicagoGranny wrote:
Thu Jul 15, 2021 7:15 am
Buddy0329 wrote:
Wed Jul 14, 2021 7:03 pm
Thoughts?
Calculate the AH you want - https://document.resmed.com/en-us/docum ... lo_eng.pdf
Looking for more of a discussion on the merits, safety, longevity of DIY versus pre-built, and battery chemistry..
Go find a BATTERY forum for your needs.

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Buddy0329
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Re: Choosing a Battery

Post by Buddy0329 » Thu Jul 15, 2021 1:18 pm

palerider wrote:
Thu Jul 15, 2021 12:25 pm
Buddy0329 wrote:
Thu Jul 15, 2021 8:54 am
ChicagoGranny wrote:
Thu Jul 15, 2021 7:15 am
Buddy0329 wrote:
Wed Jul 14, 2021 7:03 pm
Thoughts?
Calculate the AH you want - https://document.resmed.com/en-us/docum ... lo_eng.pdf
Looking for more of a discussion on the merits, safety, longevity of DIY versus pre-built, and battery chemistry..
Go find a BATTERY forum for your needs.
I deserve that. Reading my message after the fact I understand. Sorry.

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palerider
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Re: Choosing a Battery

Post by palerider » Thu Jul 15, 2021 4:18 pm

Buddy0329 wrote:
Thu Jul 15, 2021 1:18 pm
palerider wrote:
Thu Jul 15, 2021 12:25 pm
Buddy0329 wrote:
Thu Jul 15, 2021 8:54 am
ChicagoGranny wrote:
Thu Jul 15, 2021 7:15 am
Buddy0329 wrote:
Wed Jul 14, 2021 7:03 pm
Thoughts?
Calculate the AH you want - https://document.resmed.com/en-us/docum ... lo_eng.pdf
Looking for more of a discussion on the merits, safety, longevity of DIY versus pre-built, and battery chemistry..
Go find a BATTERY forum for your needs.
I deserve that. Reading my message after the fact I understand. Sorry.
You'll certainly find more people with more knowledge of battery chemistry and home made batteries.

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Mask: Bleep DreamPort CPAP Mask Solution
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Accounts to put on the foe list: dataq1, clownbell, gearchange, lynninnj, mper!?, DreamDiver, Geer1, almostadoctor, sleepgeek, ajack, stom, mogy, D.H., They often post misleading, timewasting stuff.

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loggerhead12
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Re: Choosing a Battery

Post by loggerhead12 » Fri Jul 16, 2021 11:18 am

I read through all 20 pages and don't remember a picture, so this is for us visual learners.

Image

Buddy0329
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Re: Choosing a Battery

Post by Buddy0329 » Sun Jul 18, 2021 4:06 pm

Question on the recommended setup:

The battery tender ring terminal accessory cable has a 7.5 amp fuse at least according to the Amazon listing.

I thought I read that the Airsense 10 could draw more than double that, no?

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loggerhead12
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Re: Choosing a Battery

Post by loggerhead12 » Sun Jul 18, 2021 10:18 pm

Buddy0329 wrote:
Sun Jul 18, 2021 4:06 pm
Question on the recommended setup:

The battery tender ring terminal accessory cable has a 7.5 amp fuse at least according to the Amazon listing.

I thought I read that the Airsense 10 could draw more than double that, no?
Not in any circumstances I've encountered. With pressure in the mid-teens, heated hose, and no humidifier my AirCurve VAUTO pulls an average of 0.81 amps. Adding the humidifier it still barely gets to 4 amps.

Resmed's battery chart doesn't show anything over 6 amps for the Air10 series even at pressure of 20 cm with the heated hose and humidifier blasting,

https://document.resmed.com/en-us/docum ... lo_eng.pdf

Buddy0329
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Re: Choosing a Battery

Post by Buddy0329 » Mon Jul 19, 2021 6:44 am

loggerhead12 wrote:
Sun Jul 18, 2021 10:18 pm
Buddy0329 wrote:
Sun Jul 18, 2021 4:06 pm
Question on the recommended setup:

The battery tender ring terminal accessory cable has a 7.5 amp fuse at least according to the Amazon listing.

I thought I read that the Airsense 10 could draw more than double that, no?
Not in any circumstances I've encountered. With pressure in the mid-teens, heated hose, and no humidifier my AirCurve VAUTO pulls an average of 0.81 amps. Adding the humidifier it still barely gets to 4 amps.

Resmed's battery chart doesn't show anything over 6 amps for the Air10 series even at pressure of 20 cm with the heated hose and humidifier blasting,

https://document.resmed.com/en-us/docum ... lo_eng.pdf
Thank you!

I've been searching many things on the battery front the last few weeks so I'm sure I just mixed something up from the various sources I've been looking at. Also seeing on Amazon various fringe vendor offerings that include fuses that go up to 30amps had me scratching my head.