Solar Panels on Common Property – Victoria

I have just discovered that a unit owner who is on the Committee has put solar panels on the roof of our building.  Whilst this has not taken up our entire roof they have chosen the best position for their panels.  Q1.   In the future what  will happen if other unit owners want a similar opportunity and there is no spare space?  Q2.  Or a new committee decides the roof space should be for solar panels to cover common property electricity costs?  Q3.  Should all the unit owners have been informed of this request?