What a ridiculous take. I have one of these systems and a 2kWh battery attached to it. It reduces my electricity bill by about half and will pay for itself in less than five years. I sacrifice nothing of my balcony, the panels hang outside.
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).
Installation is 2-4 hours when you do it yourself.
My city Berlin is subsidizing 250 EUR of the purchase/installation cost but it wasn't worth the paper work hassle to me.
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