Abstract: The photovoltaic panel cleaning machine is installed upon a linear array of photovoltaic (solar) panels, automatically operating periodically to remove any dust, debris, and/or light condensation from the panels to optimize their efficiency. The machine is driven back and forth along tracks extending along opposite edges of the panel array, and receives electrical power from a storage battery charged by the solar panel array. The machine includes an air compressor, a blower and nozzles that blow dust and debris from the solar panels, and two different roller brushes. Air is blown over the panels on the first pass, and the machine then reverses direction to apply a first roller to the panels for further debris removal on a second pass. A third pass is made using the air blower, and the direction reverses once again, the second roller being applied on the fourth pass to statically attract any remaining debris.