There are various techniques to mount modules on buildings which include mounting of modules on roof as well as on facade. It is easier to mount modules on roof, specially in case of an inclined roof the modules can become integral part of building roof. This needs to not only cost saving in new building but also give nice appearance and architectural look to the building. Frame less module in communication with mounting capacity of aluminium structure is of great advantage to put modules on building facade. It is important to do proper wiring and rooting cables as an integral part of aluminium structure members. For this purpose the structure members are specially design to carry wiring along with.
PV modules are subjected to shading when installed to a part of BIPV, hence it is advisable to use string inverters or micro inverters to avoid shading losses and hot spot formation on PV modules. The cables used are generally double insulated and UV resistant’s. It is important to provide enough ventilation behind the modules in order to control the temperature and reduce the losses. There are provisions for over voltage and lightning protection devices to save the solar PV system from electrical parts. A circuit breaker between the PV array and inverter is also provided so that the PV array can be disconnected during maintains or fault detection. PV modules are equipped with bypass diode and diodes block the reverse current flow. It is important to do proper system grounding so that current leakages from the PV system can be transfer to ground. It is possible to ground the PV module in the form of grounded center tapped.
Article by: Dr. Sanjay Vashishtha & Kapil Dev Sharma