HOMER-Software-Training-Guide-.pdf

We assumed for the photovoltaic panels a derating

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We assumed for the photovoltaic panels a derating factor of 80% and expected lifetime of twenty years. It has been conducted a sensitivity analysis having the size of the photovoltaic system ranging from 2.55 kW to 6.12 kW with increments of 510W. Solar panels do not require extensive maintenance; usually it is only required to remove dust from the panels twice a year so the O&M cost has been calculated as one-day of labour plus transport costs. Wind Turbine There are several small wind turbines manufactures exist but all the wind turbines available perform differently from one another. Two comparable 2.5kW wind turbines from different manufacturers may operate very differently from each other so it is important to be aware of the wind turbine power curve, cut-in speed, cut-out speed and mounting possibilities. HOMER has a list of wind turbines already definied to choose from, but if the wind turbine of interest is not included in the list it can be defined and saved in HOMER based on the manufacturer specifications. Within telecom applications there are 2 possibilities for mounting a wind turbine; it can either be mounted on the existing telecom mast or a standalone monopole. It is not always possible to mount the wind turbine on top of the mast, this configuration needs to be approved by the civil team which will need to take into account the weight of the wind turbine, the axial force on turbine at max wind speed, the max torque generating around the turbine axis at the breaking time and other parameters which could compromise the stability of the mast. For the site in the example consider a generic 2.5kW wind turbine mounted on top of the mast using one of the default models present in HOMER. Wind turbines generally require a maintenance service every year, which in our example has been calculated as one-day of labour plus transport costs.
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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 Calculate button, HOMER will calculate the different permutations of possible designs based on the inputs provided and simulate the power system. According to the design we have dimensioned we are able to compare the standard diesel generator configuration with renewable hybrid (wind and solar), pure wind and pure solar models. A consistent business case for an off-grid site should compare the existing solution (or standard operator solution in case of a new site) to the preferred renewable option. In addition by introducing the sensitivity analysis on the diesel price and primary load we are able to evaluate the financial and renewable indicators of the different models under numerous scenarios.
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