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Solar PV Module Cleaning Manual

Cleaning PV modules is very important in achieving desired generation and performance ratios in a solar power project. The performance of the plant is often poor as the PV modules are not properly cleaned and if they are clean they are not treated with pure water. Feeding birds and dust are two major factors that affect module output. Therefore, it is recommended that the following precautions should be taken when cleaning PV modules.

Your solar PV system should be shut down before starting any cleaning to avoid accidents. Also, inspect the system for modules, damaged cables, excessive dirt on the panels, etc.

The module should be cleaned in the early morning. Thermal expansion and cracks can be avoided due to the difference between water temperature and module surface temperature. If it is not convenient in the morning, it can be cleaned late at night.

The water used should be neither cold nor too cold or too hot. The water used should be free of dirt and mud. Typically, the water should be de-mineralized water so that the surface of the mod ule does not salts. The alkali water can lead to corrosion of the module frame as well as the structure.

Often module cleaning is done by spray water. The high pressure of the water can cause damage to the surface of the glass; the pressure of the water spray should not be too high to prevent damage to the glass surface.

Often a soft cloth / sponge / micro-fiber cloth may be required to clean the surface of the glass.

It is often found that some dirt / other marks still remain on the module surface. This module will lead to the hot spot on the cell and further damage the entire module. A cleaning agent is used for this and the module should be washed immediately in plenty of water to remove the chemical agent on the module surface. Acid or alkaline detergents should not be used to clean PV modules as they can cause corrosion and erosion of the module frame as well as the structure.

When cleaning modules, it is advisable to avoid mounting or walking of the module surface, as it can cause damage / micro crack in PV modules.

In the case of sloping roofs, it is extremely dangerous to clean the solar panels on your roof when it is wet. E.g. Immediately after the rains of rain. If it is not possible to clean the panel from the ground, avoid climbing to the roof without safety equipment (e.g. safety belts) and training. It is more advisable to hire a professional service for such work.

The clearer the solar panel, the more solar power generation you get.

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