It's just tying them into your houses wiring, and therefore the grid, that's expensive. That, and putting them on your roof (Because anything roofing is really expensive, which makes sense since roofing is in the top 5 most dangerous jobs in the US, and it sucks to do, and it doesn't even pay that well even still!)
Americans use more of everything. It's better to look at percentages than absolute values.
Have extremely cheap solar panels.
Solar energy per capita / income per capita. What results do you get?
The fact that income is so high in America but solar panels are not ubiquitous everywhere.
We can buy cheap solar panels in the US.
It's just tying them into your houses wiring, and therefore the grid, that's expensive. That, and putting them on your roof (Because anything roofing is really expensive, which makes sense since roofing is in the top 5 most dangerous jobs in the US, and it sucks to do, and it doesn't even pay that well even still!)