Seems like qcells are on the road to a ~28% solution with silicon-perovskite tandem cells. When I researched for my own home install, it seems most of the cost

Seems like qcells are on the road to a ~28% solution with silicon-perovskite tandem cells. When I researched for my own home install, it seems most of the cost is actually install labor, markup, electricians rates for hookup, etc. The plain BOM is close to $1-1.50 per watt for cells plus inverters and mounting hardware, but people still charge $3+ for systems.