Installation costs dominate the price. I check every few years, and while the hardware is down to about $5k for me, cost for installation remained $45k-$50k. Which is where it’s been for years. Makes diy very attractive though.
It's mostly unnecessary red tape and a broken market that cause the differences.
There's various studies comparing the two countries, Tesla did one and found various technical approach changes and permitting reforms. It suggests labor is 7% of the cost in the US. Soft costs around acquisition, sales and marketing can be 18%.
What I did was install solar with batteries and inverters that have the ability to never export power to the utility. That way I didn't have to tell them or seek their approval.