Usage:

  1. General Information: First of all the appropriate base unit has to be identified. For small projects (kWp) a factor of 1 is best used, for large projects (MWp) a factor of 1000 is better. A PV project has a certain useful life after which it is considered worthless. The nominal power is given in kWp (kilo Watt peak). The annual yield, measured in kWh per kWp, depends on the annual irradiation average of the particular location, an estimate can be obtained by using the PVGIS PV Estimation Utility. Since solar panels degrade over time the degradation per year has to be specified.
  2. Feed in tariff: Governments worldwide give a price guarantee over a period of time, usually 20 years. Enter the duration of the guarantee and the compensation for electricity fed into the grid.
  3. Income after Guarantee: After the income guarantee expires elcetricity can be sold on the energy market. The achievable price is unknown but can be estimated by taking today's energy price ( per kWh) and applying an energy price inflation (%/year).
  4. Setup Cost: The fixed cost to build the project has to be entered per kWp.
  5. Running Cost: The running cost is constituted by the lease for land, the insurance premium and maintenance costs. Insurance premium and maintenance cost have to be given as a percentage of the fixed cost. Next the inflation rate is needed to to make a forecast for the future nprice increase in costs.
  6. Financing: Unless the project is wholly financed by own funds financing costs will have to be taken into account. Three loan types are available: "Simple", "annuity" and "redeemable". "Simple" refers to a loan without any featurures such as redemptions. In this case a reserve has to b built to allow paying off the loan at maturity. "Annuity" refers to a loan that works like a mortgage. "Redeemable" refers to a loan that allows arbitrary redemptions. In this case redemption schedule can be specified. "Uniform" means that the redemptions are chosen such that a uniform dividend can be paid. "Maximum" means that all income is used to redeem the loan as quickly as possible. The costs are determined by the length of the loan in years the interest rate charged, by the fraction of money that is provided by the owner, i.e. own funds. The disagio specifies what amount is actually paid out. The investment yield that the owner can achieve when putting aside reserves in order to pay back the loan at maturity (only required for loan type "simple").
  7. Tax: Linear depreciation over 20 years is used in order to determine the deductible amount. The taxable income is determined by the income before redemption less the deduction. Then the tax rate is applied to the taxable income.
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