The solar PV-grid system consists of 80 kW PV module. The solar PV module is a 72-cell (6 x 12) poly-crystalline (model number CS6X-300M, manufactured by Canadian Solar) with a rated power of 300 Wp and can produced maximum 600 V DC. The detailed technical specifications of this model are presented in Table 1. The lifetime of the PV array is assumed to be 25 years (which is equivalent to worldwide warranty provided by the manufacturer). The initial cost of the PV is taken as US$2322 (or US$2400) per kW (Adaramola et al. ). The derating factor and the ground reflectance are taken as 80% and 20%, respectively and no tracking system is included in the PV system.
Since the power output from the solar PV module is in DC, power inverter system is required to converter the PV power output to AC power. The size of the converter is determined using Solectria String Sizer tool  and it was found that one PVI 85KW/PVI 85KW-PE inverter model can supply the required AC power output. This inverter model is designed for grid-tied electricity system. The technical specifications of this model are presented in Table 2. The cost of this inverter model is given as $28,250 . The shipment, import duty and related costs are assumed to be 30% of the cost of the inverter. Therefore, the total initial cost of the inverter model is taken as US$36725 (or US$432/kW). The lifetime of a unit is taken as 15 years with an average efficiency of 90%.
TABLE 2: The technical specifications of the selected inverter .