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Photovoltaic payback
Economic analysis of a photovoltaic system, with the determination of payback.
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ContentsInitial cost, Cost €/KWpAnnual costPower KWpAnnual Energy KWh/yContribution €/kWhinitial contribution, Annual contributionConsumption kWh/y, Annual billCost €/kWhYears contributions, Years analysis% Decay% Mortgage, Annual installmentResultCommentback to Top
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Data Chart TableInitial cost, Cost €/KWpRepresents the value of the initial investment, then the cost of the turnkey.This information should be provided by an estimate of a designer, because the value is affected by many factors (eg: cost of natural building, plant engineering, integration, bureaucratic, etc.)that only after a careful evaluation may provide a precise value. To give a rough idea, we could say that the average value is around 6000 €/kWp. This value should take into consideration the cost of replacing the inverter which has an average lifespan of 12-15 years and costs about 5-8% of the value of the plant. back to Top
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Data Chart TableAnnual costRepresents the sum of all costs such as electric charge of the operator, maintenance, cleaning, insurance, etc.back to Top
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Data Chart TablePower KWpThe nominal power in kWp of a photovoltaic system is given by the sum of the peak of the modules used,this value is declared by the manufacturer and is measured in standard conditions, with irradiation constant 1kW per square meter in the plane of the panel, at a temperature (modul) of 25°C. back to Top
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Data Chart TableAnnual Energy KWh/yThe output of energy in a year (kWh/y), the correct value is the extent made by the electricity meter (after one year of operation).An estimate may be made known: the maximum power rating, the angle of inclination of PV modules from a horizontal plane, the angle of orientation of PV modules by the south, and the coefficient of performance, which represents the fraction of the power supplied by panel which will be introduced into the power grid. The difference is caused by losses in the cables and inverter, but also from reduced performance due to temperature effects. For a facility with a PV inverter efficiency can reach a value of 0.8 (total reduction of 20%). For small systems or systems with a match modules/inverter less optimal can still expect a value from 0.7 to 0.75. back to Top
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Data Chart TableContribution €/kWhContribution €/kWhback to Top
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Data Chart Tableinitial contribution, Annual contributionThe contribution is a part that is paid from grants from municipalities, regions or nations that seek to fund the dissemination of photovoltaic energy. This contribution can be in a single installment or in annual installments.back to Top
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Data Chart TableConsumption kWh/y, Annual billThe annual energy consumption in kWh/y, is the amount of energy transferred from the distributor last year, can be derived by consulting the current bill and the previous year.back to Top
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Data Chart TableCost €/kWhRepresents the average cost for KWh of electricity charged by the operator, can be calculated by dividing the annual expenditure on consumption of energy for energy consumption for the same year.back to Top
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Data Chart TableYears contributions, Years analysisYears contributions represents the period in which the owner of the photovoltaic system will have a contribution to the energy produced, while the years of analysis represents the total period over which economic analysis is made.back to Top
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Data Chart Table% DecayThe decay of the photovoltaic system did not yield a clear trend, in the first 2 years of the decade at most 2-3%, for the next 8 years maximum of 0.7% and then a maximum of 0.5%.There are other factors that affect these values, first of all the material of photovoltaic panels, the monocrystalline silicon has lower values (about 0.1%) over the polysilicon, which in turn has lower values than the amorphous panels. Other factors are: the weather, the installation site, and type of installation. The average life of a good solar cell is guaranteed for at least 25 years (with a decline below 80%), but can reach over 40 years. The average values of decay ranging from 0.6% to a maximum of 1.1%, of course should be assessed all the factors that shaped him. back to Top
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Data Chart Table% Mortgage, Annual installmentIf you choose a loan or mortgage, for the purchase of the plant is necessary to include the interest of the funding.The annual installment will be calculated assuming that the funding will last throughout the period of the incentives and covering the full amount of the plant. back to Top
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Data Chart TableResultBack to the time required to recover the initial investment (taking into consideration of all the annual expenses) is expressed in years and months.The return on investment as interest is calculated using the expression of interest seplice: interest = (Final capital - initial investment) / initial investment / years of analysis * 100 and a compound, which is the constant interest of an investment each year and is capitalized at the end of the period of analysis returns the same Final capital. back to Top
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Data Chart TableCommentIf detected inaccuracies bug, want to suggest new features or simply express your opinion of the site web add a comment.Thanks in advance for your contribution to improve this site. back to Top
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