Haha, I have to stop reading your posts literally.
That’s interesting about the feed in tariff, i didn’t realise that it exists in different countries. They had it here too but it just ran out and was not extended as far as I know.
There’s a pay back calculator here which is interesting, and you’re right that its a 5yr payback. It’s calibrated to australia but you could substitute dutch figures:
However the firm who made this model are obviously selling solar panels so they use over optimistic inputs such as 70 percent usage of the solar power even though you’re not at home using power while at work.