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With solar panel prices ever-falling, mounting and wiring had to overtake their price at some point, and based on this graph I think it was sometime in 2021.

So can install costs keep going down or do they plateau? Seems it will soon come down to innovation outside the panels.

Source: NREL via https://www.freethink.com/energy/solar-power-in-the-us

BTW, looking like my diy installation will be cheaper than the utility-scale 2021 cost.