Dust accumulation:-
Solar panels consist of a series of carefully manufactured, wafer thin photo voltaic cells which are very fragile. However, these cells are placed and protected by a tempered glass case which is framed by noncorrosive aluminium. Because solar panels are exposed to weather they are typically very sturdy and built to withstand rain, hail and other weather-related threats. As a result, most solar manufacturers offer a full warranty over their solar panels for 20-25 years. PV panels are rated according to their productivity rating based on a new and clean PV surface. However, accumulation of dust and dirt may degrade the performance of PV panels over time unless they are constantly clean. Not to worry though as most solar manufacturers offer performance guarantees of 10-25 years. Always to ensure that PV panel installations come with a performance warranty.
Physical placement of the photo voltaic (PV) modules on the roof top surface is one of the major steps for efficient utilization of PV systems in Roof top photo voltaic applications. PV system performance is affected by several environmental and physical factors such as shading effects are the environmental obstacles, Specifications of the PV array area tilt and azimuth angles of the mounting surface. The partial shading effect is one of the most important issues in terms of power reduction in Roof top systems. It is difficult to avoid partial shading effects along the year due to the neighbouring
Obstacles around Roof top systems. Under partial shading conditions, the PV arrays present highly nonlinear curves depending on the irradiance values and the number of shaded PV
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