For a one-week stay, if I start with a full charge and drive a few miles each day, it's usually enough to keep things charged. However, I drained it so badly on Tuesday that it never fully recovered. I'm staying down here tonight as well, so after work but before I lay up for the night I am once more going to have to go out and drive around aimlessly, preferably at full freeway speed to get maximum output from the alternator, in order to recharge the battery enough to run the CPAP overnight.
What I really need is a place I could plug into ground power during the day, and while we have charging stations on our lot for electric cars, we don't have ordinary power outlets into which I could plug the RV, which accepts an ordinary three-prong/110V/15A cord. Oh, there are a couple of them around here, but none convenient to anywhere I could legally park, and I rather expect that the Security people who won't let people park overnight anymore would descend upon me for using one of them anyway. Electric cars are fine. RVs are not.