HOMER-Software-Training-Guide-.pdf

In the selected example there is also a considerable

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In the selected example there is also a considerable waste of energy caused by the unutilised excess electricity (17%). Adding more battery strings would allow to optimise the usage of excess electricity and to increase the overall autonomy of the system. By adding more battery strings and increasing the size of the photovoltaic system we improve the system performances but at the same time we are increasing the capital expenditures of the overall system and we may not have adequate space on site for the additional equipment (i.e. an average 5.1kW PV system has ~ 43 m2 footprint). Therefore the choice of the right configuration is a complex trade-off among financial, renewable, technical and design requirements. Continued:
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Step 8 Calculate Results Introduction 5 Diesel Price Objective 6 Economics 1 Downloading the Software 7 Equipment 2 Defining the Power System 8 Calculating Results 3 Defining the Site Load Green Power for Mobile Resources 4 Wind and Solar Resources By clicking the Details button in the Cash Flow label the nominal and discounted total cost of ownership are displayed, providing for each configuration item capital, replacement, salvage and operating cost (including fuel) for the entire lifetime of the project. The Cash Flow details represent a practical starting point for developing a customised business case, including financial indicators such as ROI, payback period and NPV, in comparison to the diesel generator only base case that will enable decision makers within operator organisations to make accurate investment decisions. Continued:
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Step 8 Calculate Results Introduction 5 Diesel Price Objective 6 Economics 1 Downloading the Software 7 Equipment 2 Defining the Power System 8 Calculating Results 3 Defining the Site Load Green Power for Mobile Resources 4 Wind and Solar Resources The plot section in the hourly plot label enables to compare over two layer graph the most relevant variables of the selected configuration. In the figure to the right the graph on top shows the electrical production of photovoltaic system, wind turbine and diesel generator while the below graph displays the battery state of charge throughout the year. The Simulation Results window include other relevant data concerning renewable equipment details (i.e. electrical production, hours or operation, etc.), diesel generator and batteries performances (i.e. diesel generator hours of operation, fuel consumption, battery state of charge histogram, etc.), emissions, etc. Continued:
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Step 8 Calculate Results Introduction 5 Diesel Price Objective 6 Economics 1 Downloading the Software 7 Equipment 2 Defining the Power System 8 Calculating Results 3 Defining the Site Load Green Power for Mobile Resources 4 Wind and Solar Resources Sensitivity Results The Sensitivity Results label shows through different graph types the system dependency from from the sensitivity variables.
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