So I can only contribute something about the photovoltaic material costs, since I am commissioning the system myself:
- 20.4 kWp modules (49x415W) - Full Black - 3350€
- Inverter (Huawei 17KTL), Smart Meter and WLAN dongle - 1700€
- Mounting system + cables + small parts - 4400€
- Scaffolding 4 weeks - 4000€
Total amounting to 13,450€ or 660€/kWp.
Obtained quotes were for 10kWp + 10kWh storage at 25k-28k.