See - now there’s a guy who reads the instructions. Me - I just started hacking and reverse engineering. I thought the solar just took over for the batteries during the day. My model is subtly different from @ jayjay’s - I have only one solar panel, and a fake color screen on the display head (and for some reason, mine came in a box half the size of @ jayjay’s).
But kudos to @ jayjay too as we both worked into the wee hours of our respective nights to pull this together quickly and replicate it on two continents. It was nifty to see the respective weather patterns emerge in the data!