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January 09. Photovoltaic Project Analysis Using RETScreen software Case study : 36 kWp installed in South of Spain, grid connected, fix structure. http://www.retscreen.net/. Fernando Nuño European Copper Institute fng@eurocopper.org. In cooperation with Infrysol http://www.infrysol.com /.
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January 09 Photovoltaic Project AnalysisUsing RETScreen softwareCase study : 36 kWp installed in South of Spain, grid connected, fix structure http://www.retscreen.net/ Fernando Nuño European Copper Institute fng@eurocopper.org In cooperation with Infrysol http://www.infrysol.com/
Index • What a PV system consists on? • Fix Structure vs Tracking System • RETScreen Analysis • Required inputs • Computing • Results
What a PV system consists on? Photovoltaic cells connected into modules Modules grouped into panels, panels grouped into arrays Power conditioning unit (inverter) Transformer Grid Connection Pictures: Fernando Nuño
Fix Structure vs Tracking System No moving parts, lower maintenance, more reliable operation Average production in South of Spain : 1500 kWh/kWp Easy to install and operate Needs higher maintenance and suffers higher risk of unscheduled outages Average production in South of Spain : 2000 kWh/kWp (+30%) Needs more solid foundations and stiff structure : +1€/Wp Pictures: Fernando Nuño
Analysis with RETScreen – Required inputs • Technical characteristics • Nominal Power under Standard conditions Selected PV panels Investment Selected Inverters • Efficiency in operation Investment Transformer • Efficiency in operation Investment • Cabling, civil works, grid connection works, support structure / trackers Miscellaneous Investment • Owned : how much it cost? • Renting: annual fee? Land Investment • Recurrent costs: monitoring and security, tracker maintenance, land renting, insurances Operation Annual expenditure
Analysis with RETScreen – Required inputs Selected PV panels 1.94 m2 280 Wp Efficiency = 280 W / [1,94 m2 * 1000 W/m2] = 14.4% Picture: Suntech
Analysis with RETScreen – Required inputs Selected inverters 3.5 kW 95% eff Picture: Fronius
Analysis with RETScreen – Required inputs Site characteristics • Location Here Here
Analysis with RETScreen – Required inputs Site characteristics • Building orientation related to North/South and roof slope β α ε South Picture :
Analysis with RETScreen – Computing Project Information Grid connected or off-grid applications Two types of analysis : first approach or developed in depth
Analysis with RETScreen – Computing Site reference conditions Large choice of locations around the world Provides irradiation, temperature and wind data per month
Analysis with RETScreen – Computing Two types of analysis : 1) first approach or 2) developed in depth Type of PV system Fixed, 1 axis track, 2 axis track
Analysis with RETScreen – Computing Computing slope and azimut • Slope = arctan [tan2(α) + tan2(β)]0,5 • Azimut = ε + arctan [tan(α) / tan(β)] β α ε South Picture :
Analysis with RETScreen – Results Estimated Electricity Export to grid Exported Electricity Feed-in tariff applicable in Spain up to Sept 2008
Analysis with RETScreen – Results Actual vs Estimated Export May was particularly cloudy and rainy -2%
Analysis with RETScreen – Results Number of panels Introduce the power to install and the panel efficiency Obtain the number of panels and the solar collector area
Cost breakdown 4,5 €/W 6,1 €/W
Analysis with RETScreen – Results Financial analysis Inputs Outupts Output: Cumulative Cash Flow
Analysis with RETScreen – Results Reference power generation technology CO2 emission analysis Obtain Net annual emission reduction
Analysis with RETScreen – Two axis track Two axis track 33.6 kW
Thank you! SOFTWARE CASE STUDIES by: http://www.infrysol.com/ http://www.retscreen.net/
Anex – Slope and Azimut calculations Find γ such that δγ/δε = 0 (maximum slope) β ε α η=90º-ε β α ε South Picture :
Anex – Slope and Azimut calculations Find γ such that δγ/δε = 0 (maximum slope)
Annex – Available surface on roof Where α is the lowest sun height (21 december in North hemisphere) Where β is the slope