Soon (if not already) the largest costs associated with solar installations will be the labor. It's expensive to get people on roofs and electricians to reconfigure panels, install transfer switches, etc. The equipment could be free and it would still cost thousands for the skilled trades to install.
The aluminium frame was 25%, labor 30% and putting up the scaffold 20%.
I hope thin film solar panels integrated in the actual roof material will become more common going forward as it removes the need for an aluminium frame, you get a new fresh roof, it's lighter, no holes are drilled in the roof etc.