Photovoltaic system battery storage subsidy feed-in tariff?

In the statements "up to 200 charge cycles per year," one means complete charging and discharging. From this results the amount of electricity the battery could deliver at all. For example, 200 x 9 kWh p.a. = 1800 kWh p.a.
10 years lifespan = 18,000 kWh delivered.
Divided by acquisition costs = storage costs per kWh.
Without considering the generation costs.
The 10 years are, of course, only assumed.

I have already seen the effect in an hour-precise simulation tool. The larger the battery, the fewer cycles. Accordingly, in the end, both 2.56 kWh more (10.24 kWh) and 1.4 kWp more (400W modules) would have been useless for me. But even 33% less storage (5.12 kWh) led to less savings through self-consumption with calculated additional costs per kWh of +300€ after depreciation (-44% with solidarity surcharge). But every additional kWh can be used less and less (Winter: not charged, Summer: not discharged). Transition phase and heat pump via battery (secondary, as cheaper) also influence this.

The simulation tool interests me. Where can it be found?

I am interested in the simulation tool. Where can it be found?

Linking is not possible, but you can google "Beratungstool Batteriespeicher". I have modified it for myself after unlocking for proper WP electricity.