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[CPAP] Deep Cycle Battery
#1
I am going camping for a week and want to know what type of deep cycle battery I should buy for a Resmed Airsense 10. I will not have much access to electricity, so I need one that will last as long as possible. Thanks!
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#2
What kind of travel is this? Lower priced batteries are heavy. Lightweight lithium batteries are expensive and have other drawbacks. Your machine is 24 volts and requires an adapter to use a 12 volt battery. Take a look at the possibly related threads under this post, your answer may be in an existing thread.
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#3
Since you have a machine that uses 24 volts you can wire two 12 volt batteries in parallel for 24 volts. Thats a great option since you wont require an inverter that would cut out at when your battery falls below 11.7 volts for a 12 volt battery and converting back to dc would be a waste. If your machine has a heated humidifier you may need to contact the manufacture for power requirnments at your humidity setting to determine battery size.

If no humdification you could buy any two deep cycles and wire in parallel and they would last a week.
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#4
I have the same machine. Using ResMed's battery guide I determined that to run my machine for 8 hrs I needed a 49ah battery. This takes into account that you dont run these below 50%. So to run it two nights I wanted a 100+ ah battery. I'm buying the battery below. That will run it for a bit over 16 hours with the humidifier and heated hose on.

ResMed battery Guide:
http://www.resmed.com/us/dam/documents/a...lo_eng.pdf

Battery
[commercial link removed per Apnea Board rules]

You will also need this DC converter:
[commercial link removed per Apnea Board rules]

I'd recommend putting it in a battery box for safety:
[commercial link removed per Apnea Board rules]


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#5
(07-28-2015, 01:45 PM)jingo Wrote: Since you have a machine that uses 24 volts you can wire two 12 volt batteries in parallel for 24 volts.

NO YOU CAN'T!!!!!

The ResMed S9 and A10 machines will only work if connected to their own AC power supply or their overpriced DC-DC converter. There are extra wires apart from the power wires and the machine will refuse to work if it doesn't see the signals it wants on these other wires.

If you want to work on DC power, you'll need an inverter and the AC supply or the separate DC-DC converter. Note that S9 and A10 machines use different DC converters. The DC converters will run off of 12 or 24V, but there's not a real advantage to 24V.

BTW, ResMed says you can run the S9 off of an inverter, but doesn't say that for A10 machines. They don't specifically forbid inverters, but the document that mentions inverters for S9 machines only lists the DC converter for A10 machines.
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#6
Archangle,

Please don't consider me confrontational. I have a amount of experience with electronics both as a professional and a lifetime hobby. The quality and features of the ResMed DC-DC converter make it worth the cost. I paid less than $100 shipped. I use it full time with an AGM battery and a BatteryTender. The power goes off briefly several times a month where I live. The power went off a couple of nights ago. Now that I have this backup system I am not forced to wake up and turn my A10 back on. From my initial experimentation, the battery should run my setup at least two nights without a recharge. The ResMed DC-DC converter is more efficient than a home brew system I was designing. It is also has a battery protection circuit that is very useful.

Just my 2 cents worth.

Jeff
Sleep is worth the effort.
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#7
Well, 2 12-volt would need to be in Series for 24 volts Wink The ResMed DC-DC converter will run off 12 or 24 volts. so either setup would work; just gotta know what the voltage is to set the converter correctly.
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#8
@ foss --- Well, you did say you would wire two 12V batteries in _parallel_ to get 24V.... I'm sure you meant to write _series_...

I think that is what he was shouting about :-)

Phil, who knows which end of a soldering iron to grab... :-)
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#9
Hi shahn,
WELCOME! to the forum.!
Much success to you with your CPAP therapy.
trish6hundred
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