How photovoltaic power station to cope with the rainy season?

Aug 23, 2023

With rainy season coming, the weather will become increasingly hot and humid. For photovoltaic power plants, on the one hand, the peak period of power generation is ushered in; on the other hand, the fluctuating temperature and frequent thunderstorms also pose a lot of challenges to the safe and efficient operation of the power plant. Take you from the following Starting from several aspects, learn more about the precautions for photovoltaic power plants:

1. Anti-high temperature 2. Anti-storm 3. Anti-lightning


1. How to prevent high temperature?

Ensure air flow: ensure smooth air circulation around the inverter. Do not install the inverter in a narrow and closed environment. If multiple inverters are installed on the same plane, it is necessary to ensure that there is enough space between This not only ensures the ventilation and heat dissipation of the inverter, but also has enough operating space for later maintenance.


Avoid wind and sun: Although the protection level of our inverter meets the requirements for long-term use in outdoor environments, reducing the chance of the inverter being exposed to wind, sun, and rain can prolong the service life of the inverter. When installing the inverter, you can choose to install it at the bottom of the module or under the eaves. If the inverter is installed outdoors, it is recommended to install an awning at the same time, which can not only provide shelter from wind and rain, but also reduce direct sunlight, reduce the temperature of the inverter, avoid load reduction caused by overheating of the inverter, and ensure power generation efficiency.


2. How to prevent heavy rain?

Rainstorms are frequent in summer, and the main impact on photovoltaic power plants is that a large amount of rainwater soaks cables and components, and the insulation performance is degraded or even damaged, causing the inverter to detect a fault and fail to generate electricity.


The sloping roof itself has strong drainage capacity, and generally there will be no excessive water accumulation; if the lower edge of the module is low on the flat roof, it may be soaked by rainwater; for photovoltaic power plants installed on the ground, rainwater washing the ground may cause module imbalance .


If the roof where the photovoltaic power station is installed is a sloping roof, there is basically no need to worry about heavy rain. If it is a flat roof, it is best to consider the drainage problem during the design and installation of the photovoltaic power station. It should be avoided that the photovoltaic modules are soaked by rainwater due to the relatively low bracket installation of the flat roof when the rainfall is too heavy.


Specific measures to prevent rainstorms in power stations:

a. When designing a power station, geographical and geological factors should be taken into consideration, such as the orientation of the selected terrain, the degree of slope fluctuation, hidden dangers of geological disasters, depth of accumulated water, flood water level, drainage conditions, etc.

b. For the power stations that have already been built, scientifically add drainage systems.

Note: During inspection and maintenance in rainy days, avoid bare-handed electrical operations and do not directly touch the inverter, components, cables and terminals with your hands. You need to wear rubber gloves and rubber boots to reduce the risk of electric shock.


3. How to prevent from lightning?

For the lightning protection of photovoltaic power stations, in addition to the conventional protective grounding on the component side, support side and distribution box side, the inverter, as the core electrical equipment of the photovoltaic power station, should also be well protected against lightning protection. Electrical grounding and protective grounding for protection.


Electrical grounding: Generally, the electrical grounding will be connected to the PE row of the electric box, and then grounded through the distribution box. The electrical grounding point is generally located at the AC terminal of the inverter, and there is a PE ( Ground) symbol identification.


Protective grounding: The inverter body has a grounding hole for grounding to protect the safety of the inverter and operators. The protective grounding point of the inverter is located on the body of the inverter and has a grounding mark. It is generally recommended to only connect to the protective ground (because lightning current discharge, faults and static electricity all go to the protective ground).


Protection against direct lightning strikes: set up metal lightning protection grounding conductors on tall buildings, including lightning rods, lightning protection belts, and grounding devices, which can release the huge thunderstorm cloud charge. All electrical equipment in the photovoltaic system cannot protect against direct lightning strikes.


Inductive lightning protection: Photovoltaic systems have lightning protection modules in electrical equipment such as combiner boxes and inverters to protect against indirect lightning strikes. The inverter has two levels of lightning protection and three levels of lightning protection. The second level of lightning protection uses lightning protection modules, which are generally used in medium and large photovoltaic power plants. There are no tall buildings around the power station. The third level of lightning protection uses lightning protection devices. It is used for household small-scale photovoltaic power plants, and there are tall buildings around the power plant.


The photovoltaic power generation system is equipped with lightning protection devices, and the Deye inverter has a built-in secondary lightning protection module, so it does not need to be disconnected in normal lightning weather. If there is a strong thunderstorm, for safety reasons, it is recommended to disconnect the DC switch of the inverter or the combiner box, and cut off the circuit connection with the photovoltaic module to avoid damage caused by induced lightning.

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