Parameters  Description 

Review period  Full years without the year of commissioning must be stated as the period under consideration. According to VDI 6025, the period under consideration corresponds to the time span of the planning approach for calculating the economic efficiency time (planning horizon). 
Interest on capital  The current value of the current yield can be specified as the return on capital. The current yield is the average yield of bonds. The Deutsche Bundesbank calculates these as the average value of the fixedinterest securities in circulation. The umlaut yield is thus a measure of the interest rate level on the bond market. 
Sales tax  This input field has no influence on the calculation, but is intended to make it clear that all entries must be entered with or without sales tax. As a rule, you enter all amounts net. If you enter gross amounts, you must enter gross amounts everywhere. 
The feedin tariff in the first year is calculated from the feedin tariff and the yield resulting from the simulation.
Parameters  Description 

Depreciable investments  Depreciable investments are the total (net) acquisition costs of the PV system (material, scaffolding, assembly, etc.) required to build the system. Detailed input: Useful life The useful life is the period of economic use of the investment object in years. Useful life < Period under consideration The investment must be reprocured. The price for the replacement depends on the specified price change factor. Useful life > Period under consideration At the end of the observation period, the investment still has a residual value, which is included in the calculation of the capital value. 
Onetime payments  Oneoff payments are costs that cannot be written off. They are taxed directly. 
Funding  Funding reduces costs. They do not influence depreciation, but are taxed directly. 
Operating costs per year  
Consumption costs per year  
Other costs per year  
Other revenues / Savings per year 

Price change coefficient  The price change coefficient indicates the average percentage change in a payment compared to the previous year. 
On the Financing page you can define up to 3 loans that are used to finance the PV system.
Parameters  Description 

Loan capital  Loan amount on the basis of which interest and repayment are calculated. The loan amount can be stated in absolute terms in euros or as a percentage of the investment volume. The investment volume here is defined as investments and oneoff payments less subsidies. 
Payout rate in % of debt capital (discount)  This value indicates which percentage of the specified debt capital is actually paid out. Please note that a discount in the results evaluation is regarded as an interest payment in the first year. The amount paid out on the loan is calculated by multiplying borrowed capital by the payout rate. The sum of the disbursement amounts of all loans should not exceed the investment volume defined above. 
Loan period  The period after which the loan is repaid. 
Loan interest  Nominal interest rate to be paid on the remaining debt. 
Redemptionfree startup years  No repayment is made in this period, only interest payments. In the remaining time until the end of the term, the borrowed capital is then repaid in instalments. 
Repayment period  Interest and instalment payments are made at these intervals. 
Instalment loan  Instalment loans are repaid in constant instalments. The interest payments to be made are recalculated from the remaining debt after each instalment payment. The total repayment installment results from a constant repayment portion and a decreasing interest portion. 
Annuity loan  Annuity loans are repaid in constant instalments over the term of the loan. The repayment portion within this repayment installment increases with the number of installments, while the interest portion decreases accordingly. 
To ensure that tax payments are taken into account in the cost efficiency analysis, proceed as follows:
Activate the check box Consider taxes and Income / corporation marginal tax rate.
This is the tax rate to be paid for each additional taxable euro (or other currency).
(optional) Take into account a change in the marginal tax rate
Make specifications for depreciation
See also