Battery Backup for resmed aircurv 10

[loggerhead12]

How many hours do you think something like this might last ?
https://www.jackery.com/products/jacker ... 4423198807

Could we boondock for a 4 or 5 day trip with it ?

518 watt hours is a pretty good supply, but it all depends on how much of that the built-in battery management system will allow you to use before it shuts the Jackery down to protect the battery from completely discharging. I average 80 watt hours in an 8-hour night with pressure in the mid teens, heated hose, and humidifier on auto. Five nights would be 400 watt hours.

[babydinosnoreless]

The Jackery 500 is loaded with a lot of stuff you don't need. the battery they put in it is only rated for 518 amps. this seems a lot for a cpap that will only use about 90 watts per 8 hours of use. cut the 518 amps in half you will only have half the battery you can use safely if you want this unit to last. for this kind of money. you can do much better and get twice the battery power by going with an 100 amp hour AGM battery. theres plenty of good AGM batteries you can buy today. its all up to you how much you want to spend. 100 amp battery is rated for 1200 watts. cut this battery in half you only have 600 watt battery you can use with your cpap. divide 90 into 600 you can use this battery for 6 days. now you have to have something to charge this battery. solar power is great if you have the sun. no sun you need a generator along with a battery charger to top off your battery. when I boondock I go out for 30 days or more. I have a Renogy 100 watt solar suitcase along with a Victron blue smart 20 amp battery charger.

You're using a lot of terms that that are going to confuse people looking for information, because you're using them wrong.

I know I'm completely confused luckily my husband understands most of this stuff.

[babydinosnoreless]

How many hours do you think something like this might last ?
https://www.jackery.com/products/jacker ... 4423198807

Could we boondock for a 4 or 5 day trip with it ?

518 watt hours is a pretty good supply, but it all depends on how much of that the built-in battery management system will allow you to use before it shuts the Jackery down to protect the battery from completely discharging. I average 80 watt hours in an 8-hour night with pressure in the mid teens, heated hose, and humidifier on auto. Five nights would be 400 watt hours.

Thank you for that 80 watt hour number.
My pressure is pretty high but I don't use the heated hose and keep my humidity on 1. Depending on where we are at I can probably get by with passover humidity. I'm pretty sure my husband is looking at regular generators too but this is for when we can't run a regular generator and don't have shore power. I understand some places now don't allow regular gas powered generators. Camping has sure changed ! When we had our last rv we had a Genset that we turned on when we needed to recharge everything. Of course back then I didn't have the air curve and he didn't have the scooter either.

[stevenal]

No generators after 10 is and has been a rule in many campgrounds.
If you are in an RV, suggest having a pair of deep cycle house batteries that recharge via solar panels during the day.

[stevenal]

Electrical quantities are hard to visualize, so try this thought experiment:
Imagine a gasoline powered CPAP connected by a fuel line to a full gasoline tank suspended above. The number of nights will depend on the size of the tank in gallons and the rate the fuel flows in gallons per night. If you begin with 1200 gallons, and use 80 gallons per night, the math is:
(1200 gal)/((80 gal)/night)=15 nights.
In my example, gallons of gasoline is energy. Gallons per night is power (defined as the time rate of change of energy).
In the electrical world, watts are used as units of power. This unit may not look like a time rate, but it is. A watt is equal to a joule per second, a joule being a unit of energy. A more commonly used unit of energy is the watt hour (Wh). In the electrical world, the math might look like this:
(1200 Wh)/((80 Wh)/night) = 15 nights
Amp hours (Ah) are trickier, since they are not conserved values such as power and energy. Multiply your battery Ah by its voltage rating to get Wh, and now you have a conserved (according to Newton) quantity. This means you can take it through invertors, rectifiers, DC-DC convertors, etc. with only a bit of loss to factor in. Ah is really a unit of charge, and no similar gasoline unit come to mind.
In summary:
Gallons of gasoline, joules and Wh are all units of energy.
Gallons of gasoline per night, Wh per night, and watts are all units of power.
Clarification:
The examples above are not meant to indicate the energy in a gallon of gasoline is anything close to a Wh. I used the examples simply to illustrate the principal in a way that used numbers already in the thread.

[mibbim]

hi, loggerhead12, I think I got most of what you saying... but must miss something

"1. the battery
2. the battery charger (battery tender)
3. accessory plug/cigarette lighter adapter
4. Resmed converter

You can manually plug the battery into the battery tender to charger it, then plug the battery into the accessory plug to run the CPAP."

I am clear about #1 connect to #2 to charge the battery, but regarding to the "plug the battery into the accessory plug to run the CPAP", do you mean #3+#4+#1 to connect to the cpap? Thx again!