Your pricing in not to far off for Europe. My Brother installed a system with Battery backup in Germany and he is tithing me about his low energy usage from the grid.
He ask me if I put up a Solar system and if I could use my Smart as Battery backup. I told him no. The only Car I new was the new Ford F150 Lightning Pickup Truck with the optional upgrade and the cost about $100K US.
A 8 KW solar system without Battery is $36K (2017 Quote) here in the US. At less the $0.10 a KWh for Hydropower here in the Pacific Northwest it does not make sense to invest into solar yet.