Water butt with submersible pump connected to a smart socket, tray watering with little float shutoff valves and a more ambitious project to link arduino soil moisture sensors to electrically operated water valves that I never got round to finishing
(, Tue 9 May 2023, 17:13, archived)
But I think a little trickle feed solar panel with a storage battery for the pump/droppers and a small heating element to stop it getting totally freezing in winter.
(, Tue 9 May 2023, 17:33, archived)
(, Tue 9 May 2023, 17:34, archived)
Plus my greenhouse heater was a bitcoin mining ASIC in a home made water resistant server enclosure so solar panels wouldn't really have cut it.
(, Tue 9 May 2023, 23:07, archived)