A: There are some hints that we can elaborate on here to help photovoltaic owners to conclude if their system has been installed properly and if it is working properly.
a. Ask your installer to issue an installation inspection certificate, stating clearly that the system has been installed and complies with the National and International Standards and Regulations. Most common standards that are applicable for photovoltaic installations are IEC62446, IEC60346 and BS7671.
b. Ask, additionally to manufacturers warranties, for at least two years of warranty for the installation, as well as free maintenance (usually the cost of the maintenance is included in the initial cost but this will force the installer to deliver better quality of work)
c. Ask the installer to warranty the performance of the photovoltaic system.
d. Use your monitoring system to monitor and compare the performance of your system to other similar systems that may be installed in the area.