I’m currently in the middle of a personal project to automate watering my vegetable beds. One of the goals is that this system should be battery powered, and trickle charged off a solar panel or two. I’d quite like to include some form of battery monitoring. The documentation for the Voltage/Current sensor suggests that this can be done using bidirectional current measurement, but doesn’t elaborate more than that. Online, I find various sources suggesting how to monitor battery levels, but they aren’t very clear, or I've been looking in the wrong place.
Do you have any advice for