A simple automatic balcony plants (tomatos) watering system powered by sun.
The battery I chose was a 12V, 1.4Ah, Sealed, Lead Acid Battery. I bought it from here for ~7$. The box is designed for this very battery. Its dimensions are the following: 97 x 43 x 52 x 58mm
I bought a brand new washer pump compatible with BMW/Mercedes Benz and others. You can easily find it from any car parts vendor. The part code is: FEBI BILSTEIN 23113.
I found a 5W solar panel with a solid construction and sturdy frame.