‘A Solar Roof without batteries in Illinois had an estimated cost of $5.72 to $6.54 per watt depending on roof complexity. Another estimate from Texas ranged from $6.05 to $6.77 per watt.’
‘Roof size does significantly affect the overall cost of a system. A small roof (1,594 square feet) in Illinois could cost around $54,000 to $58,148 after the federal tax credit, Tesla estimates. That’s $3.78 to $4.05 per watt, much closer to the cost of solar panels, though still more expensive. (Tesla solar panels there would cost $2.54 per watt after the federal tax credit.)’
