It shouldn’t escape for it has no where to go! It’s on a third story above an asphalt parking lot. I harvested the seeds and took all the plants down just a couple weeks ago.
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.
The three buckets each have different roles (starting from the right): electronics enclosure, water reservoir with a 5v pump, soil. So, no tap or electricity on the balcony. I have to schlep water about once a week, not too bad.