Panels are not the biggest cost of solar anymore, and even in the US they make a pretty cheap building material per square foot. Installation, mounting, etc. a

Panels are not the biggest cost of solar anymore, and even in the US they make a pretty cheap building material per square foot. Installation, mounting, etc. all add up to be a big chunk of the cost of solar these days. Even making the physical panel size bigger drives down system cost, merely by reducing the number of panels that need to be mounted.