Photos of Ingenuity show dust on the solar panel. Does air moved by the rotors keep it clean enough to [edited] keep charging the batteries?
JPL reports that Ingenuity's flight shook some of the dust off its solar panels, so it has more power now.
This is confirmed in the briefing:
“Ingenuity is extremely healthy at this point,” Balaram said in a de-briefing session with reporters on Monday. In addition to shaking off dust, the batteries are “looking good, comms are fantastic” and the landing gear, solar mechanisms, computers and avionics “behaved flawlessly.” - Bob Balaram, chief Ingenuity engineer.
For solar panels on other spacecraft on Mars covered in dust, a locally-flown helicopter-like craft might be able to help to clean them!
Then presumably the helicopter could be recharged from them through some local inductively coupled power transfer, or by docking with its own "ground station landing pad" with solar panels that it also keeps clean.
The vehicle’s future was uncertain for long: The same winds that have blown away dust from the solar panels would cover them again, as Mars experienced unprecedented dust storms. In February of this year, a fifth rover – ‘Perseverance’ – landed successfully on Mars. Unlike its predecessors, it brought a small helicopter, called ‘Ingenuity’ (header image). Whilst the helicopter is solar powered, the rover is driven by a radioisotope battery instead.
Even without epic Martian dust storms, a previous 90-day mission by the ‘Sojourner’ rover saw its power output reduced by 23% by the mission’s end. Similarly, accumulating dust here on earth reduces solar panel energy production – after one month by up to a third in arid regions like the Middle East, unless they are expensively maintained.
A Mars rover can be angled to ‘catch’ surface winds and blow accumulated dust away, but earth’s solar farm panels are fixed in place. ‘Aerial Power’ envisions to bring the cleaning wind to solar panels. It has developed cleaning drones that detect the solar panels. The highly accurate self-flying drones create down-draft over these – row by row. The downward airflow bows away soiling such as dust.