ᐅ Photovoltaic system in a new build: Would you install one? Any experiences?

Hello everyone,

I am in the final stages of planning my house.

Here are the key details of the building:

- Location: Low mountain range
- House: Timber frame
KFW 55 --> Qp = 40.9 kWh/m² and H′T = 0.259 W/(m²K)
Thermal bridge loss = 0.038 W/(m²K)
Usable roof area: approx. 40 m² (430 sq ft)
- Roof pitch: 35 degrees gable roof
- Orientation: Southeast
- Roof window: 1 centered
- Heated building volume: 497.9 m³ (17,580 cu ft)
- Usable floor area: 159.3 m² (1,714 sq ft)

The heating system will be an air-to-water heat pump and a central controlled mechanical ventilation system with heat recovery.

At the moment, I am considering the possibility of installing a photovoltaic system.

Putting ecological considerations aside and focusing purely on economic factors, is a photovoltaic system worth it in the long term? Does it make sense to try to reduce heating and electricity costs with such a system?

I think the payback time will be quite long, and it provides the least output in winter when the heat pump consumes the most energy.

What are your thoughts on installing such a system? Would you build one?

Thank you very much.

Best regards,
Steffen