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From Solar Hybrid Storage systems, how to dissipate heat is the most important issue. According to the BCC report, a famous survey in the world, 55% of the failures of most electronic products are due to poor heat dissipation. The reliability of electronic devices is very sensitive to temperature. For every 1-degree increase in device temperature at the level of 70-80 degrees, the reliability will drop by 5%. If the temperature is too high, the reliability of electronic products will be reduced.
At present, there are three main cooling methods: one is natural cooling, the other is forced air cooling, and the third is forced liquid cooling. In the optical storage system, components, cables, switch boxes, small power inverters, small battery boxes, etc. generally use natural heat dissipation, medium and high power inverters, medium and small power energy storage devices, and the cooling system generally adopts forced air cooling. For large lithium battery energy storage containers, some manufacturers have begun to use forced liquid cooling.
Except for common system-level heat dissipation design, the optical storage system also has some technical parameters of the equipment. The surface seems to have nothing to do with the temperature, but it is actually determined by the temperature.
1. The Current carrying capacity of the wire
The current carrying capacity of the wire is the maximum current that the wire can carry. For example, a cable of 6 square millimeters can pass a current of 70A. The current carrying capacity on the surface is only related to the material, cross-sectional area and installation environment of the wire. The current carrying capacity is determined by the temperature. If the temperature is low enough, the superconductor cable of 6 square millimeters can also pass the current of 700A or even 7000A.
2. Power generation and temperature of components
The power generation of photovoltaic modules is related to illumination. Generally speaking, the higher the irradiance, the higher the output power. The summer from July to August is the irradiance time in most parts of my country, but from the comprehensive statistical data Look, the month with the highest power generation is not July-August when the irradiance is the highest, but May or October.
Photovoltaic modules are semiconductor materials with internal resistance, which will consume a part of electric energy. Like copper-aluminum cable materials, the internal resistance of photovoltaic modules also increases with the increase of temperature. In summer, infrared rays are strong, and infrared heat will increase the temperature of photovoltaic modules. Reduce power generation. Therefore, although summer has the advantage of strong light and increased light time, it will also have a negative impact on the power generation of the power station, such as high temperature in summer, high air humidity, relatively frequent severe weather such as heavy rainfall and thunderstorms, and these factors will affect the photovoltaic power station. of power generation.
High Temperature when installing
The components and the inverter itself are a heat source, all the heat must be dissipated in time and cannot be placed in a closed space, otherwise, the temperature will rise higher and higher, the inverter should be placed in a space with air circulation, and try to Avoid direct sunlight. When multiple inverters are installed together, in order to avoid mutual influence, there should be enough distance between the inverters.
Maintain ventilation and heat dissipation, whether it is components or inverters, the distribution box must be ventilated to ensure air circulation. For the components of the rooftop photovoltaic power station, do not unreasonably arrange the arrangement of the photovoltaic power station components in order to generate more power, causing the components to block each other and affecting heat dissipation and ventilation. It is necessary to ensure that the surrounding areas of photovoltaic modules, inverters, and power distribution boxes are open.
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