Solar panel cleaning device and solar panel cleaning method

A solar panel cleaning device for cleaning a panel surface of a solar panel while travelling over the panel surface, the solar panel cleaning device comprising:

• a main body portion;
• a plurality of cleaning units provided for the main body portion;
• and
• a plurality of travelling units provided for the main body portion, wherein
• each of the plurality of cleaning units includes
• a base,
• an injection port,
• a gas unit having one end thereof connected to the injection port and the other end thereof connected to the base, the gas unit configured to emit a jet of gas into the injection port, and
• a liquid unit having one end thereof connected to the injection port, the liquid unit configured to emit a jet of cleaning liquid into the injection port, wherein
• gas emitted in a jet from the gas unit causes cleaning liquid emitted in a jet from the liquid unit to eject, in a form of atomized aqueous liquid as water particles, from the injection port toward the panel surface of the solar panel in a forward travel direction at an ejection angle of the water particles is from 15° to 75° with respect to the panel surface of the solar panel.