The first stage where QC is performed is the conceptual phase. Here, the most important aspect is design verification. The expected output of the PV system is tested through computerized simulations that depict the system’s ability to withstand harsh environmental conditions. Next comes the installation stage where various QC tests are performed including pre dispatch inspections, visual controls, dimensional controls and damage controls. In the final commissioning stage, the PV system is tested for its performance and output. Test runs are carried out to ensure that production has followed the correct procedures and start up time has been saved. This stage of QC continues throughout the lifespan of the system (assuming an O&M contact has been signed) and includes regular monitoring and inspections of the PV site to ensure maximum productivity.