Depending on your daily power usage and on how often you will be driving, it might make things a lot simpler to charge the battery while driving and forget about solar.
True, but if boon-docked in a tent a few days… you might want some recharge.
Personally I hate the portable power stations. A lot of money for not much and you have a great battery.
More panel watts would be appropriate for a “good system” but not necessarily for your goals. For <$300 you can get two 100W panels, cables, and a basic charge controller programmable for your battery. That’s going to keep you going for days assuming the cpap is 12VDC.
Add a
small pure-sine inverter that includes usb charging as a bonus for only $50
If the cpap is 19VDC or 24VDC, you’ll probably want a larger 12V-120VAC inverter capable of enough watts to run it but it sounds like you already have it figured out for 12V? Which is the most efficient way if possible to run off 12VDC directly.
In short, you’ll have way more usable flexibility if you add 200W of panels and a charge controller with that small inverter and spend less than the suitcase battery powerstation thingies. You have a good battery already!
ADDED STUFF
On amazonian the windyNation 200W kit with the P30L pwm charge controller might be worth looking at. I believe you can program out the ‘equalize’ (death for lithium) and I know you can set the voltages, etc. That was my first solar purchase and it did very well for the two years I used it.
But if you bought the two pak of windyNation monocrystaline panels they are smaller, and the 10A Epever charge controller I think is like $60. Buy some cables and that inverter, and come up with something to hold the panels (bungee cords to a tree!) and you’re in business for not much money.