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All PV cells produce DC electricity, but some PV arrays have built-in inverters to convert to AC. This determines whether the PV array produces AC or DC power. PV Inputsįrom the main section of the PV page, you can edit the following inputs. See the help article about Optimization for a more detailed explanation of HOMER's optimizer. With the optimizer turned on, HOMER automatically finds the best capacity for you. The search space is replaced by a lower bound and an upper bound. Include a zero if you wanat HOMER to consider systems without this PV.Ĭlick the Star icon to enable the optimizer. Enter the nominal capacity of the PV in kW, or enter several quantities for HOMER to consider in the system optimization. Search SpaceĬlick the MPPT or Inverter tab to see the Search Space. Note: The capital cost is the initial purchase price, the replacement cost is the cost of replacing the PV panels at the end of their lifetime, and the O&M cost is the annual cost of operating and maintaining the PV array. For a PV array size of 6 kW, HOMER would extrapolate from the 2 kW and 3 kW costs, giving a capital cost of $16,000. For a PV array size of 2.5 kW, HOMER would interpolate between the 2 kW costs and the 3 kW costs, giving a capital cost of $7,250.
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If HOMER then simulates a system with a PV array size of 0.1 kW, it would extrapolate from the 1 kW and 2 kW costs, giving a capital cost of $300. For example, if the marginal capital and replacement costs dropped to $2,500/kW and $2,100/kW, respectively, for quantities above 2 kW, fill in the Cost table as follows: If the cost of the PV subsystem was not linear with size, you can enter multiple rows of data in the Cost table. The operating and maintenance (O&M) cost is specified as 0. In the sample above, the capital cost of PV panels is specified at $3,000/kW and the replacement cost is specified at $2,500/kW. Typically this requires only a single row because analysts often assume that PV costs vary linearly with size. In the Costs table, enter the PV cost curve, meaning the way the cost varies with size. Note: The capital cost is the initial purchase price, the replacement cost is the cost of replacing the PV system at the end of its lifetime, and the O&M cost is the annual cost of operating and maintaining the PV system. You can include the costs of the power electronics in the capital cost, or account for them separately in the MPPT or Inverter tab. When specifying the capital and replacement costs, be sure to account for all costs associated with the PV system, which may include: The Costs table includes the initial Capital cost and Replacement cost per kilowatt of the PV system, as well as annual operation and maintenance (O&M) costs per kilowatt. On the PV page, you can manage information for the model. On the PV Set Up page, select an option from the drop-down list and click the Add PV button. To add a solar component, click the PV button under the Components tab in the toolbar.
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Temperature: You specify whether to consider the effect of ambient temperature on panel efficiency, and if so set the relevant inputs.Advanced Inputs are where you can set certain advanced variables.MPPT: If the Electrical Bus is set to DC, you set the parameters of the maximum power point tracker (DC to DC converter) here.Inverter: If the Electrical Bus is set to AC, you specify inverter parameters here.The PV page provides access to the following tabs: You can specify whether a PV is a concentrating PV in the Photovoltaic Library. The PV component can represent both flat panel and concentrating PV technologies.
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The PV page allows you to enter the cost, performance characteristics, and orientation of an array of photovoltaic (PV) panels and choose the sizes you want HOMER to consider as it searches for the optimal system.