Powering them is one of the greater engineering challenges that we had to deal with, because powering a cell phone under a tree canopy, any sort of solar power under a tree canopy, was an as-yet-unsolved problem, and that's
Cargarlos es uno de los mayores retos de ingeniería al que nos enfrentamos, porque cargar un móvil bajo la copa de un árbol con energía solar, era un problema aún