Not OP, but I installed a "Balcony solar" 1.4kWp panels 2.4kWh battery system on my parents garage. The only subsidy was the tax free purchase of the components (we did file for an additional tax break with the city, but they had already run out of funds for that because it is so popular). You also save a lot of money on installation costs.
Cost breakdown:
- 400 EUR 2.4kWh 48V battery
- 320 EUR 4x 360W solar panels
- 200 EUR 800W microinverter
- ~200 EUR for helping hands when getting the panels onto the flat roof
- 160 EUR flat roof mounting equipment
- 153 EUR solar cable, connectors and crimping tool
- 115 EUR MPPT charge controller and cables
- 95 EUR electrics (e.g. fuses, dc/dc converter for OpenDTU)
- 50 EUR other assorted costs
So about 1693 EUR in total.
Total yield after 1.3 years: 1715 kWh (including power fed back into the grid)
Of that, discharged from battery: 488 kWh (battery already paid back ~146 EUR)
At the current energy costs, 1715 kWh would be ~514 EUR imported from grid
A kW of panels produces about 1000kWh a year in a sunny location in Germany. Electricity is around 30c/kWh. A 1kW+2kWh batteries and inverter set costs about 1k€ shipped from Amazon.
Not the person you are replying to but my four panels with about 2000W cost me about 370€ shipped including an inverter and cables.
The main subsidy is that you don't pay VAT. There are some smaller subsidies but they are local and come from the town/region you live in (none available in my area, for example).
