The Common Causes of Accidents in PV Stations(one): PV Modules

22/01/2022 Slocable

Existing solar power plants have frequent accidents, and various caused by the construction quality, equipment quality, operation and maintenance quality and natural disasters of the existing photovoltaic power plants emerge in an endless stream. The best way to solve a problem is not to let it happen, but try to eliminate it at the source.

Carbon neutrality is becoming an important task for the international community year by year, and solar energy, a clean energy source, will play a major role in the dual-carbon goal, and will continue to thrive. It is foreseeable that whether it is a ground power station or a distributed power station, Photovoltaic industry will enter a stage of large-scale growth. But there are also more and more issues that come with it, which has attracted the attention of the industry. Safety is the lifeblood of photovoltaic power plants. Also, it is closely related to your profit or return. Regardless of the photovoltaic power station scene on the ground, mountain, roof, etc., safety is a principle.


Here, we’d like say something that related to the “faults” of PV modules in PV station accidents.

The Main Reason of PV Modules’  failure

The Hot Spot Effect

Under certain conditions, due to the existence of local shadows, the current and voltage of some cells in the solar cell module change, thereby causing a temperature increase on these cell modules in some place. The defects of some cells in photovoltaic modules themselves may also cause local heating of the modules during operation, which is called "hot spot effect". This effect can seriously damage solar cells. Part of the energy generated by the illuminated solar cells may be consumed by the shaded batteries, and in serious cases, the solar cell modules will be permanently damaged or even burned, causing fires and endangering personal safety.


How to avoid hot spot effect effectively

Daily maintenance of PV modules

The surface of the module should be kept clean, and the PV modules can be cleaned regularly or when the output of the PV array is lower than 85% of the initial state output, the modules can be cleaned.

Check daily to see if there are any modules that cannot receive sunlight and have shadows formed.

Cleaning precautions

Cleaning tools: soft and clean cloth

Cleaning liquid: similar to component temperature. No corrosive liquids.

Climatic conditions: Wind power > 4, heavy rain, heavy snow and other meteorological conditions are prohibited from cleaning

Cleaning time: without sunlight or in the morning and evening. When the photovoltaic modules are heated by the sun, washing with cold water will break the glass cover.

If the following problems are found, the PV modules should be adjusted or replaced immediately:

Photovoltaic modules have broken glass, scorched backplane, and obvious color changes;

The presence of air bubbles in the PV module that form a communication channel with the edge of the module or any electrical circuit.

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