EE (specifically embedded systems) here: just how much power do you need to zap a weed effectively? I would’ve thought a 40W laser would have been more than enough, and then scale that up for a hundred acres.
only solar would be tough, but a small EV battery with a large panel in the sun for 12h seems like it’d be a lot of juice to run WeedZapper2000 with a topping off charge overnight, no?