Help configuring battery

[trg-s338]

I use a CPAP machine to keep my airway open while I sleep. I want to
configure a light and energy dense battery setup so I can go camping
with my CPAP. Figure on three days worth of power. Trying to keep
costs down as a third criteria. Thinking Lithium Ion. The CPAP input
is [email protected] amps. Figuring on a 20 watt power consumption. Question
is, as a novice, am I correct in figuring I'll need 480 watt-hours (20
watts x 8 hrs sleep x 3 days). Seems like a sizeable battery pack if
I am not mistaken. Who do I get it from? I know Li battery
technology can be somewhat dangerous if mishandled i.e. overheated,
hot overcharge, ect. Is there a more practical battery technology
suggestion for my application that I am not aware of? I'll gladly
take any suggestion or guidance and link to research. The criteria
again is reliability, lightweight and portable, compact as is
practical. Thanks in advance.

 

[Jamie]

I use a CPAP machine to keep my airway open while I sleep. I want to
configure a light and energy dense battery setup so I can go camping
with my CPAP. Figure on three days worth of power. Trying to keep
costs down as a third criteria. Thinking Lithium Ion. The CPAP input
is [email protected] amps. Figuring on a 20 watt power consumption. Question
is, as a novice, am I correct in figuring I'll need 480 watt-hours (20
watts x 8 hrs sleep x 3 days). Seems like a sizeable battery pack if
I am not mistaken. Who do I get it from? I know Li battery
technology can be somewhat dangerous if mishandled i.e. overheated,
hot overcharge, ect. Is there a more practical battery technology
suggestion for my application that I am not aware of? I'll gladly
take any suggestion or guidance and link to research. The criteria
again is reliability, lightweight and portable, compact as is
practical. Thanks in advance.

Hmm.
1.5 AH (Amp Hour)*8 = 12 AH * 3 = 36 AH battery..

Don't know your camping arrangements how ever, you should
consider a portable solar cell for day time charging, or
get your self a hand crank generator to bring up the battery
while your lying around day dreaming on that camping adventure.

P.S.
it's possible your machine does not demand that current
at 100% duty, you might want to measure to see the intervals.

http://webpages.charter.net/jamie_5"

 

[Tom Biasi]

I use a CPAP machine to keep my airway open while I sleep. I want to
configure a light and energy dense battery setup so I can go camping
with my CPAP. Figure on three days worth of power. Trying to keep
costs down as a third criteria. Thinking Lithium Ion. The CPAP input
is [email protected] amps. Figuring on a 20 watt power consumption. Question
is, as a novice, am I correct in figuring I'll need 480 watt-hours (20
watts x 8 hrs sleep x 3 days). Seems like a sizeable battery pack if
I am not mistaken. Who do I get it from? I know Li battery
technology can be somewhat dangerous if mishandled i.e. overheated,
hot overcharge, ect. Is there a more practical battery technology
suggestion for my application that I am not aware of? I'll gladly
take any suggestion or guidance and link to research. The criteria
again is reliability, lightweight and portable, compact as is
practical. Thanks in advance.

I'll bet that your machine doesn't draw 1.5 A. continuous, just on peaks.

*Electronics subject digressing:*
Are you backpacking, if so are you alone?
If you are car camping, no problem.

Tom