Construction costs are currently skyrocketing

that's not really true ("nix"). Because with a 20kWp system you generate about 450 kWh in January. That is often enough to significantly reduce electricity consumption (halve it or less?). Still, with the current prices I wouldn’t know how I would decide either. The situation is simply "unfavorable"

You can't really fit a 20kWp system on the roofs of normal urban villas (150m² living space). Even if you calculate with 4m²/kWp, you need 80m² of roof area... my hipped roof has at best 60m² usable on east, south, and west, the rest are slopes and necessary free spaces. And a factor of 4 is already ambitious, normally people calculate a factor of 5-6?

And then the question arises about the sense?? A 20kWp system costs... 25,000 EUR? Sure, during the 3-4 winter months you get 450kWh/month, so just under 2,000 kWh. And the other 8-9 months, when the heat pump doesn't run, then around 18,000 kWh. Of that, you feed 15,000 kWh in, currently... 5 cents/kWh?

That's something for people who like autonomy and can afford it. Economically speaking, that's far from any profitability consideration.

Hello:

In January, we harvested 233.5 kWh with our 13 kWp system with a house consumption of 640.0 kWh. In Feb. 22, 434.7 kWh was generated and 526.0 kWh was consumed... so you can see, even a small photovoltaic system can deliver quite well and contribute to sustainability. :cool:

And what will you do with the estimated 1,500 kWh you generate in July? Surely, 1,000 kWh worth 6.x cents each will go into the grid... I mean, it's nice if you enjoy it. But financially, it's not worth it, is it?

There are also bungalows. For us, two roof sides are fully (most productive) covered and we come to 13.26 kWp with 340w modules. If we now take 410w modules and fully cover the other two sides, we come to an estimated approx. 30 kWp.