@HoseCrusher and @CapnLoki, thank you so much for your clarifications! Now I have a clear idea of how to go about this project.

Off to order what I need now...

PT

do not wait until the week before to start asking questions. Too late! I really had no idea this would be so complicated, so started off trying to figure it out on my own, which often works. But it finally became clear that I need help with this. It is possible to charge from the car using regular ...

Forgive me, another electricity "dummy" here... You've posted a lot of good information here, but I can't parse it all. And I'm not sure how it applies to my situation, which is this: I'm going to be car camping for about a week, with no access to "the grid." I want to be able to use my CPAP every n...