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Photovoltaic Power Station Inverter Housing Is Too Hot. Is There Any Risk?
- May 15, 2018 -

As the power electronic equipment, the main function of photovoltaic inverter is to convert the direct current generated by photovoltaic modules to alternating current. Because there are tens of thousands of electronic components and most of them are heat source devices, the heat dissipation design has great influence on the life of the inverter. Not all of the users, however, know it all, so we often get the question, "a inverter device installed on the roof of my house, the temperature of the chassis on the surface, is the inverter having a problem?" "Is the inverter going to explode?" Wait。 Of course, the answer is not so. Let's explain to you through the analysis of the mainstream heat dissipation plan and the third party TUV data report.


With the development of photovoltaic inverter technology and the improvement of efficiency, the heat dissipation form has changed from the original fan to the following 3 kinds of mainstream heat dissipation design.


Design of 1. integrated die casting die without fan


Advantages: first, the two parts of the upper and lower parts of the mold shell integrated heat dissipation, not only greatly increased the heat dissipation area, but also greatly reduced the heat transfer impedance; secondly, the internal heat source device can be excellent heat dissipation, not only to ensure the balance of heat dissipation inside and outside the inverter, but also make all kinds of devices in the best working state.


Disadvantages: for customers with high power density and no fan design, customers have misunderstandings. It is considered that the insufficient heat dissipation of the device will result in the reduction of the power generation and the life of the inverter.


The representative model 1:H manufacturer inverters. The internal temperature of the inverter is the same as that of the case, and the internal temperature is about 55 degrees at ambient temperature of 45 degrees.

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The representative model 2:Y manufacturer inverters. The internal temperature of the inverter is the same as that of the case, and the internal temperature is about 60 degrees at ambient temperature of 45 degrees.

Photovoltaic power station inverter housing is too hot. Is there any risk?

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Scheme 2: Design of ordinary sheet metal external fan


Advantage: the surface temperature of the chassis is low.

Disadvantages: the size of the inverter fin is small. Although the heat of the internal heat source can be taken away by the fan, the heat dissipation of the whole heat source device is not uniform. Not only that, the inverter also has the high heat dissipation impedance of the external and internal heat source devices, and the internal heat is not easy to pass to the surface of the chassis, so that the internal device temperature is much higher than the surface of the chassis, which may lead to the reduction of the equipment or the long-term thermal life of the internal devices.


The representative model 1:S manufacturer inverters. The internal temperature of the inverter is about 15 degrees higher than that of the case shell, and the internal temperature is about 65 degrees under the ambient temperature of 45 degrees.

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The representative model 2:S manufacturer inverters. The internal temperature of the inverter is about 15 degrees higher than that of the case shell, and the internal temperature is about 70 degrees under the ambient temperature of 45 degrees.

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Scheme 3: ordinary sheet metal fan design


Advantage: internal heat exchanger design can quickly transfer heat flow from internal heat source to inverter surface.

Shortcomings: the outer shell is not the die casting mold design, the heat dissipation impedance and the heat dissipation area are inferior to the die casting mold product, not only the inverter surface temperature is high, but needs the larger radiator (increase the chassis volume) to make the support.

The representative model 1:G manufacturer inverters. The internal temperature of the inverter is about 15 degrees lower than that of the case. When the ambient temperature is 45 degrees, the internal temperature is about 55 degrees, but the surface temperature is as high as 75 degrees.


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Conclusion: through the above analysis and data, it is not difficult to find that the inverter without fan design, such as scheme 1 and scheme 3, is obviously higher than the fan design, and the temperature can often reach 60 degrees. But do not worry that it will cause a fire, because it is only the temperature of the outer box (the outer box is 60 degrees in the normal range of the inverter without fan design), and the internal temperature of the equipment is lower. 


The inverter, which is shown in scheme 2, is a typical example of a lower surface temperature corresponding to a higher internal temperature. It is conceivable that the device working in such an internal environment will reduce the life of the inverter. In this case, you may not be able to doubt "what kind of design is used by the Sheng Nen Jie product". The answer is clear: Sheng Nen Jie's product adopts an integrated design of no fan die casting mould, reasonable internal heat dissipation layout, and ensures the best heat dissipation, longer life and stable operation of the inverter.


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