For a current example from southern Germany, the following profitability results for an annual consumption of 80,000 kWh with 80 kWp ultra-light PV, an electricity price of 40 euro cents net, a self-consumption of 70% of the solar electricity and a financing of 80% of the investment with an interest rate of 4% p.a.:
Cashflow
In this case, the return on investment (IRR) is 82.4%, the payback period on the equity is 0.9 years, and the payback period on the total project is 4.3 years. In other words: After less than one year, the invested equity is earned back. Over its lifetime of 25 years, the plant generates a cash flow of almost half a million euros.