• The green roof can help to keep ambient temperatures around the solar PV panels at or near 25˚C, which is the best temperature for the panels to work most efficiently.
• The panels can create shaded area underneath, and rain run-off distribution unevenly. This can create a ‘habitat mosaic’, allowing a wider variety of vegetation and biodiversity.
• If designed properly, the green roof assembly can provide the required support anchor for the solar PV panel A-frames, thus no impact on the roof waterproofing underneath.
• Altogether they combine the benefits of a green roof with the generation of renewable energy. 

• Loading capacity is critical, while waterproofing installation and drainage system need to be considered.
• Spacing and disposition of solar PV panels are important, e.g. not too close, to allow reasonable growing space for the green roof.
• The solar PV panels are usually mounted higher, to allow sufficient solar radiation and rainfall for the vegetation.
• Overall building layout and façade study for the orientation.
• Using climatic simulation tools to dig out the most problematic location for the study.
• To utilise the façade glazing for as BIPV for gaining energy for the use.
• BIPV systems are grid connected type to eliminate the bulky and troublesome battery banks.
• Can have various color options or texture for the selection.
• Dust, dirt and fouling of solar panels are major sources of inefficiency and loss in solar generation.
• Coating for PV can solve the problem and upkeep the efficiency of the PV panels.
• Nano hydrophobic coating helps panels to let water flow off more easily and therefore would make the solar panel more efficient during inclement weather.

P*N*R*Tf*Lf

where   P= peak power rating of PV module

                N=nos. of PV module

R= daily mean solar irradiation, kWh/sqm(2.82, 2.75, 2.82, 3.29, 3.91. 3.97, 4.6, 4.23, 4.01, 3.95, 3.44, 2.98)

Tf=

Lf= overall loss / correction factor

Please click HERE to view the list of terminology.