The solar waterer uses a 5v solar panel, a dfrobot charge controller and a Wemos D1 Mini clone board driving a relay. My proudest achievement is the uptime shown in the last pic. 55 days since last reboot and that was an intentional update of the tasmota firmware. All on solar and a 10500mah battery, no external power.
OP here responding to popular demand.
The solar waterer uses a 5v solar panel, a dfrobot charge controller and a Wemos D1 Mini clone board driving a relay. My proudest achievement is the uptime shown in the last pic. 55 days since last reboot and that was an intentional update of the tasmota firmware. All on solar and a 10500mah battery, no external power.