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Entitled: The Problem of Increasing Human Energy - Through the Use of the Sun, the article was published by his friend Robert Johnson in The Century Illustrated Monthly Magazine for June 1900.
The title of the chapter where he discusses this device is called: A Departure From Known Methods -Possibility of a "Self Acting" Engine or Machine, Inanimate, Yet Capable, Like an Living Being, of Deriving Energy From the Medium -The Ideal Way of Obtaining Motive Power.
But Tesla's solar panel is just a shiny metal plate with a transparent coating of an insulating material.
That the device works at night is explained in terms of the night time availability of cosmic rays.
Tesla also refers to the ground as a vast reservoir of negative electricity.
Properly designed, free energy devices do not have any limitations.
In The Brooklyn Eagle newspaper, Tesla announced, on July 10th, 1931, that: "This new power for the driving of the world's machinery will be derived from the energy which operates the universe, the cosmic energy, whose central source for the earth is the sun and which is everywhere present in unlimited quantities." Dating back more than 25 years ago from 1933 would mean that the device Tesla was speaking about must have been built before 1908.
Tesla's invention is very different though, but the closest thing to it in conventional technology is in photovoltaics.