Robotic solar panel cleaning system

A cleaning system for a solar panel, comprising:

• a frame moveable in a transverse direction over the solar panel, the frame having transverse edges oriented in the transverse direction;
• a brush assembly positioned within the frame, the brush assembly including a plurality of brush holders arranged within the frame, the brush holders moveable in a longitudinal direction within the brush assembly, each brush holder being adapted to interchangeably receive a brush for cleaning the solar panel;
• and
• a liquid spray arrangement including:
• a plurality of rows of nozzles positioned within the frame and oriented in the transverse direction, the plurality of rows of nozzles configured to spray at least one of water and a water detergent mix onto the solar panel;
• and
• at least one additional row of nozzles adjacent to at least one of the transverse edges of the frame, the at least one additional row of nozzles positioned such that as each one of the plurality of brush holders is moved in a longitudinal direction and reaches the end of the frame to be positioned adjacent to the at least one of the transverse edges of the frame, the nozzles of the at least one additional row of nozzles are configured to spray the at least one of water and the water detergent mix onto each one of the plurality of brush holders positioned adjacent to the transverse edges of the frame to directly clean the brushes or the solar panel.