We noticed that Vbatt was only about 12.0V and likely wouldn't last the night. No charging happened today due to stormy weather. We decided to swap in our one spare battery. Found that the entire battery box was mostly filled with water, so dumped that out. (Hope the others in the stations aren't similarly filled!) Even though we tried to keep the charge controller going, it reset and lost its settings. Set md=1 again and now seems to be happy.