If labor was free, and you didn't need a permit or certified equipment to attach to the roof and utility lines, and there were no taxes, then that's close to wh

If labor was free, and you didn't need a permit or certified equipment to attach to the roof and utility lines, and there were no taxes, then that's close to what you would pay. $0.60 cells and $0.40 string inverter $0.20 cheap brackets. For very large commercial/utility installations it falls close to that ($1.40 including land and transformers). https://pv-magazine-usa.com/2016/09/29/nrel-u-s-utility-scale-solar-costs-fell-below-1-50-per-watt-in-q1-2016-with-charts/ https://pv-magazine-usa.com/2016/09/29/nrel-u-s-utility-scal...