Overnight Result

By the morning, the material is saturated with moisture, so when the sun hits the solar panels, and the heat from the solar panels comes into contact with the material, it turns the moisture into vapour and drives it out of the hydrogel layer. The metal box below then collects the vapour and condenses it into water. 

None of these steps consumes the electricity generated by the solar panel, meaning that if the system gets scaled up, the electricity produced by the panels could be fed directly into the grid, and the heat produced by the panels could be used to grow crops.