@Bongerscc if all you want is to take some pre-charged batteries with you to power you CPAP, then just get a 12v DC charger for your AirSense 11 and a 12v socket that you can directly hook up to a spare battery. This will cost about $50 plus the battery and whatever you need to charge the battery at home.
I have an AirSense 11 and have been using
this adapter from Amazon for over a year when camping, in car, and in the RV. It works great (
https://www.amazon.com/FLGAN-Charger-AirSense-R390-7230-Machines/dp/B0BHW7KY37).
Then get a 12v socket like this:
https://www.amazon.com/dp/B08D1XS411.
Hook this directly to a 12v battery, plug in your CPAP, and you are ready to sleep safe and sound!
You can get a multiple 12v socket receiver in case you need to run a second CPAP
, charge a phone, or run a 12v cooler. It would be easy to get more batteries and wire them in parallel to increase the Amp hours to power more stuff or the stuff you have for longer.
https://www.amazon.com/Cigarette-2-Socket-Splitter-Replacement-Waterproof/dp/B0C4F5842T
https://www.amazon.com/Cigarette-Lighter-Socket-Volt-Outlet/dp/B0B823FZFJ
https://www.amazon.com/dp/B0BGL458WD
I would really encourage you to buy a LiFePO4 (LFP) battery over any other kind. For many reasons:
- Lithium batteries run until they shut off. A lead acid battery will drop in voltage (kind of fade out) which won't be good for the CPAP.
- Lead acid also only let you use half the stated charge so they really are not the savings they appear to be at first.
- Lithium batteries weigh less than half as much as lead acid batteries. Combine this with the fact that lead acid batteries can only use half their capacity, then per usable capacity were are talking 25% of the weight.
- Lithium batteries last 10 times the cycles of a lead battery.
- If stored properly, Lithium batteries lose about 1% of capacity percent a month. Where stores the same a lead acid battery can lose up to 1% a day.
- Lithium don't have the off gassing a lead acid battery has.
- A lithium battery you buy now can be used later if you decide to build up a system later (like add solar or an inverter).
With a 15% safety margin, a 100amp hour 12.8v LiFePO4 battery will give you almost 1100Wh of power. Your CPAP uses an average of 56.1W of power. That safely gives you about 20 hours of use for each 100Ah battery
without recharging the battery.
Combine the battery with the solar and you are on your way. Remember the panels are never as efficient as the label. But you should be able to get at least one hour of CPAP time for each hour the panel has good sun exposure. This would make your system pretty sustainable with good sun exposure.
You also might consider a 12v to 12v DC Lithium charger so you can charge your Lithium batteries when driving or in case of emergency.
Get this so you can go now. Then you can build up the system using the same batteries later.