High power consumption on battery, Resmed Airsense 10

Biomed_ZZZ wrote: ↑

Thu Nov 21, 2019 6:01 pm

babydinosnoreless wrote: ↑

Thu Nov 21, 2019 4:42 pm

Since I'm not on CPAP yet, I don't know why anyone would need a battery except for backup power in the event of a power outage at home and I do understand that.

While I personally don't get it (I'm a big fan of creature conforts) many people actually hike in to camping places or go mountain climbing or various other forms of "getting away" where bringing a big battery might not work.

Interesting, I would't and didn't think of hiking or mountain climbing carrying a CPAP device with battery backup.

We have forum members who go on 2 week long white water rafting trips and carry along solar panels to recharge the battery.
They refuse to let needing cpap keep them from doing the things they love and they refuse to sleep without it.
Where there's a will there is a way.

palerider wrote: ↑

Thu Nov 21, 2019 4:54 pm

Biomed_ZZZ wrote: ↑

Thu Nov 21, 2019 11:33 am

\but I would certainly want a 75 AH battery over a 35 AH battery if I was concerned about power outages

a 35ah battery will give you about 5 nights without heat... which is good enough for most power outages... people that want extended runtime often add a solar panel for extended runtime.

Biomed_ZZZ wrote: ↑

Thu Nov 21, 2019 11:33 am

Just my thoughts!

Just my thoughts!

I guess that's true and for most places about 5 nights would hopefully be enough to get power back on. With the solar cell charger even if it didn't charge the battery fully it would extend the battery charge enough to continue using it.

Good thoughts!

Pugsy wrote: ↑

Thu Nov 21, 2019 6:08 pm

Biomed_ZZZ wrote: ↑

Thu Nov 21, 2019 6:01 pm

babydinosnoreless wrote: ↑

Thu Nov 21, 2019 4:42 pm

Since I'm not on CPAP yet, I don't know why anyone would need a battery except for backup power in the event of a power outage at home and I do understand that.

While I personally don't get it (I'm a big fan of creature conforts) many people actually hike in to camping places or go mountain climbing or various other forms of "getting away" where bringing a big battery might not work.

Interesting, I would't and didn't think of hiking or mountain climbing carrying a CPAP device with battery backup.

We have forum members who go on 2 week long white water rafting trips and carry along solar panels to recharge the battery.
They refuse to let needing cpap keep them from doing the things they love and they refuse to sleep without it.
Where there's a will there is a way.

I see that!

Biomed_ZZZ wrote: ↑

Thu Nov 21, 2019 6:01 pm

babydinosnoreless wrote: ↑

Thu Nov 21, 2019 4:42 pm

Since I'm not on CPAP yet, I don't know why anyone would need a battery except for backup power in the event of a power outage at home and I do understand that.

While I personally don't get it (I'm a big fan of creature conforts) many people actually hike in to camping places or go mountain climbing or various other forms of "getting away" where bringing a big battery might not work.

Interesting, I would't and didn't think of hiking or mountain climbing carrying a CPAP device with battery backup.

I've seen posts from people here doing those things and more. RV living, boat trips, international travel. I've decided I live a very boring life.

Back when I was in my 20's I wanted to backpack around the wilderness, the closest we got to that was family campgrounds. Back then it was going light, removing anything extra that weighed anything.

We don't travel regularly but when we do it's either by car, plane, cruise ship or combo of them. All of them relatively easy to carry things. Last year we went to Italy on a tour and that was probably the most "difficult" traveling we ever did.

It's interesting to see that people can and do use their machines past my limited vision on using them. It would have probably been the first thing I would have eliminated if I were to do any wilderness type things. And never thought of a solar panel to charge a smaller battery. This thread was an eye opener for me!

If you want to go the non-lithium way, you will probably want an AGM deep cycle battery. AGM is a lead-acid battery, which in theory could offgas, but probably won't be an issue. You don't need to add water - a very nice feature and it will not spill if knocked over..

You want a "deep cycle" battery, not a "starting" or "marine" battery. Starting and marine batteries don't support the draining of power over a long period like a deep cycle. They are made to support the fast discharge of starting a motor.

All lead-acid batteries only want to be drawn down to about 50% of capacity and then should be recharged as soon as possible. Drawing the battery down more than 50% or not promptly recharging a deeply discharged battery will severely limit the battery life.

As a lead-acid battery discharges, its voltage also is drawn down. Some CPAP's I'm told, want voltage within a pretty narrow band, so you want your battery voltage to remain in that band.

Recharging the depleted battery is a whole new kettle of fish. I use a Battery Minder unit (not Battery Tender) with an 8-amp charging capacity on my smaller batteries, I keep it on 24/7. Several decisions on chargers beyond the scope here.

I have a travel trailer and have made a lot of battery errors - killed some batteries before their time - which ultimately made me do a lot of studying to protect expensive batteries from an early failure. Both how you draw the battery down and also how you recharge it are important to keeping your investment useful.

There are several errors that need to be addressed here.

River-Runner wrote: ↑

Thu Jan 02, 2020 1:54 am

Starting and marine batteries don't support the draining of power over a long period like a deep cycle.

Marine batteries come in starting, combo and deep cycle, you don't want a marine battery of any sort because they are more expensive, having been built more sturdy to avoid being destroyed by the pounding they endure on a boat.

River-Runner wrote: ↑

Thu Jan 02, 2020 1:54 am

They are made to support the fast discharge of starting a motor.

This is true of all starting batteries.

River-Runner wrote: ↑

Thu Jan 02, 2020 1:54 am

All lead-acid batteries only want to be drawn down to about 50% of capacity and then should be recharged as soon as possible. Drawing the battery down more than 50% or not promptly recharging a deeply discharged battery will severely limit the battery life.

The discharge threshold on starting batteries is more like 85%, not 50, that's the primary difference.

When camping, I use a Duracell Powerpak Pro 1300 portable 12 volt battery for my air sense 10, plugged into the cigarette lighter outlet on the portable battery. Fully charged, with humidifier off and at 10 psi, I get about 2.5 nights of use. If I am going for more than 2 days (and without electrical hookup) I have a Renogy 100 watt "suitcase" solar panel. I plug the output of the solar panel straight into the cigarette lighter outlet of the portable battery. On a strong sunny day, it will top off the battery from a single night's use in about 2 hours. I then switch it over to charging the trailer batteries. All in all, a kind of expensive solution. But it works.

irajacobs wrote: ↑

Sun Aug 30, 2020 7:48 pm

. . . at 10 psi . . .

No cpap is capable of producing that pressure--which would be FATAL.
PSI is not the same as centimeters of water.
Also, you revived a dead thread--and it's not even Halloween.