Well, the financing calculation for a photovoltaic system typically takes 15 to 20 years. I simply doubt that you will be able to get a heavily state-subsidized leased car like you currently do over the course of 20 years.
Even then, you didn’t even address this point, the Casus Knaxi.
And in November, the car charges 'anyway' for free in the drizzle in the afternoon?
And your
With an electric car, you kill two birds with one stone.
only works if you have good sunlight and either work from home or, decadently, can always switch between two cars: one on one day for work while the other charges. And then switch on the next workday... unless the weather was bad the day before, then you have to take the bus.